Podcasts about hydrodynamics

In this episode of the Critical Oxygen podcast, Coach Aaron Geiser and I discuss how to improve swimming performance for triathletes. We emphasize the importance of proper swim form, the role of video analysis in identifying deficiencies, and the need for a focused approach to training. We highlight how small adjustments in technique can lead to significant improvements in efficiency and performance, as well as the importance of consistency and mindset in endurance training. We also discuss effective strategies for swim training, emphasizing the importance of breaking down sets, progression in training, and the significance of swim form and technique. The discussion highlights the need for safety, confidence, and the enjoyment of the swimming process, while also encouraging athletes to utilize video analysis for improving their swim form. TAKEAWAYS - Proper swim form is crucial for efficiency. - Swimming more does not guarantee faster times. - Video analysis helps identify and correct deficiencies. - Focus on one aspect of technique at a time. - Hydrodynamics play a significant role in swimming performance. Enjoy! Enjoying these podcasts, subscribe to get notified when new episodes are released. If you have a question or topic you want us to address, leave a comment! Follow Phil on Instagram - https://www.instagram.com/criticalo2 Follow Aaron on Instagram - https://www.instagram.com/triageiser/ Interested in learning more about physiology? Check out the Critical Oxygen website for blogs, courses, and coaching - https://www.criticaloxygen.com/ CHAPTERS 00:00 Introduction 02:32 The Importance of Swimming Form 04:24 Building Efficient Swim Techniques 11:21 Utilizing Video for Swim Improvement 17:11 Reprogramming Swim Stroke for Efficiency 23:20 Mindset and Consistency in Training 30:32 Progressing Swim Volume and Specificity 31:00 Optimizing Swim Training: Breaking Down Sets 35:55 Progression in Swimming: Building Endurance and Speed 41:08 The Importance of Swim Form and Technique 44:00 Critical Swim Speed: Understanding Pacing and Performance 52:01 Open Water Swimming: Transitioning from Pool to Open Water KEYWORDS endurance, swimming, triathlon, swim form, efficiency, training, coaching, performance, technique, video analysis, swimming, swim training, endurance, swim form, critical swim speed, open water swimming, triathlon, performance, technique, progression

Episode: 3243 Hollywood's Heroic Water FX.  Today, water effects.

A lot of us really complicate things in the water, but today we're looking at a few “simple” concepts that can really make a difference in your swim speed. We'll look at how and why to master these techniques and what it will mean for your overall enjoyment of the sport and the swim. These are not drills, they are effective and relatively simple techniques that you must make second nature before you will get faster. We also look at Louisville 70.3 and the panic around water and road conditions. Topics: Louisville 70.3 Race water quality Facebook panic Road conditions Online swim school What we see in swim analysis Early vertical forearm Breathing Tucking chin Out of breath? Sink to the bottom Lungs too full of air? Hydrodynamics vs. aerodynamics It's all about the drag Going out too fast Finding good breathing BEFORE the race When drills make no sense Firm but not rigid The Clock analogy Do drills WHILE you're swimming Swim slower and own your form   Mike Tarrolly - mike@c26triathlon.com Robbie Bruce - robbie@c26triathlon.com

Lesser scaup are one of several duck species in North America that have experienced long-term population declines, and despite decades of research, the exact cause of this decline remains unclear. Because of its profound importance as a spring stopover site for migrating scaup and other divers, Pool 19 on the Mississippi River has played a crucial role in numerous scientific studies. In this episode, PhD candidate Cheyenne Beach and field assistant extraordinaire Jack Johnson join Dr. Mike Brasher to explain why so many divers show up on Pool 19 each spring; what we hope to learn from long-term banding of scaup, canvasbacks, and redheads; and how an ongoing GPS tracking study is helping understand how the invasive faucet snail may affect scaup health and productivity.www.ducks.org/DUPodcast

LOOP 2.3: Hydrodynamicist Dr Tom Fletcher, Silverback Films, returns to explore the science behind Dunkleosteus. How much of the fossil is known? How does the model compare to the latest reconstruction of the animal? How much of the design is dictated by hydrodynamics? and is Dave ironically cool? Life On Our Planet (LOOP) is a new 8-part series created for Netflix by Silverback Films and Amblin Television. This Steven Spielberg produced series, narrated by Morgan Freeman, is hugely ambitious in its scope, telling the story of life throughout the whole Phanerozoic Eon. Ancient organisms and environments are painstakingly recreated by the supremely talented Industrial Light and Magic, whilst modern natural history scenes add vital context to the story. This show has been worked on for six years, during which time countless papers were read and around 150 different palaeontologists contributed their time and knowledge. The whole production had culture of letting the scientific research dictate scenes, resulting in one of the most accurate on-screen representations of prehistoric life there has ever been. And how do we know all this? Well, our very own team members Tom Fletcher and Dave Marshall have been embedded within the LOOP team since day one! We are therefore in a totally unique position to reveal to you the work that went into this series, from both the production and research side of things. In this unofficial series, we've been granted exclusive access to many of the people responsible for creating LOOP, we explore what it takes to create a palaeontological documentary and we delve deeper into the science with some of the show's academic advisors. Each day, we will be releasing batches of interviews, each relating to a specific episode of LOOP. Image courtesy and copyright of Netflix.

Episode: 2935 In which humpback whales revise airfoil theory with the tubercles on their flippers.  Today whale aerodynamics.

On this weeks show Voltz has returned to the hot seat and proceeds to cross examine Chris about his trip to NZ. Also on the show we get into the weeds with Hydrodynamics and what that means with some of the new materials coming out into the market. We also learn a new term "Swolldermort", be sure to work that into a sentence this week. And we open ourselves up to your input at the end of the show. Grab you pen an paper folks as we attempt to sound smart on this show that breaks down the seemingly simple.. how a crab fly swims and knowing where to fish them when new to an area.  This show is brought to you by the good folks at Nervous Water, Kettafly, Power Pole and Beast Brushes

They have dug through mysteries, faced gunfire and car crashes, put together pieces of this puzzle since arrival days ago in Ithaca and the time has finally come to see for themselves what science and the beyond have uncovered.  Cross Lake Dam and Dr. Fritz Zwicky awaits... Check us out online at www.nastygramrpg.com  Find us on facebook at www.facebook.com/nastygram  and our group is at https://www.facebook.com/groups/865467380821766; we are @nastygramrpg on both Instagram and Twitter. We are lucky to have awesome music on our pod!  More about A Wilhelm Scream here https://www.awilhelmscream.com/ Composer Adrian von Ziegler at https://adrianvonziegler.bandcamp.com/album/the-complete-discography and composer Antti Martikainen at https://anttimartikainen.com/

Dr. Peterson's extensive catalog is available now on DailyWire+: https://utm.io/ueSXh Dr Jordan B Peterson and Dr. Richard Lindzen dive into the facts of climate change, the models used to predict it, the dismal state of academia, and the politicized world of “professional” science. Richard Lindzen is a dynamical meteorologist. He has contributed to the development of theories for the Hadley Circulation, hydrodynamic instability theory, internal gravity waves, atmospheric tides, and the quasi-biennial oscillation of the stratosphere. His current research is focused on climate sensitivity, the role of cirrus clouds in climate, and the determination of the tropics-to-pole temperature difference. He has attained multiple degrees from Harvard University, and won multiple awards in his field of study such as the Jule Charney award for “highly significant research in the atmospheric sciences”. Between 1983 and 2013, he was the Alfred P. Sloan Professor of Atmospheric Sciences at MIT where he earned emeritus status in July of 2013. - Sponsors - Exodus90: Is it time for your Exodus? Find resources to prepare at https://exodus90.com/jordan. Black Rifle Coffee: Get 10% off your first order or Coffee Club subscription with code JORDAN: https://www.blackriflecoffee.com/ - Links - For Dr. Richard Lindzen: MIT Page: https://eapsweb.mit.edu/people/rlindzen - Chapters - (0:00) Coming Up(1:19) Intro(4:40) Why you should listen to Dr. Lindzen(13:00) How Ivy league hirings work(16:00) Harvard or MIT?(18:00) Emphasis on racism in the sciences(19:22) Administrators outnumber faculty and students(20:00) Wasting time on a broken grant system(22:00) There is no money for questioning mainstream science(24:00) 1800's science papers shock students(25:30) Scientific journals are not endorsements of the science they publish(27:40) 1970's, they notice an increase in Co2(30:10) Classism and religious warping(33:40) Impoverishing ourselves for no reason(38:00) Objections to the narrative(40:00) Coriolis effect(45:48) Jordan plays devils advocate(50:05) Politicians base their policy on scientific summaries written by politicians(53:20) Bjørn Lomborg: even if they're right, it's not a big deal(54:22) Tipping points, how they actually work(57:00) Averaging anomalies(1:03:00) Climate threat still five thousand years away(1:08:00) Computer models, limitations and benefits(1:12:13) Fluid dynamics(1:14:45) Models on top of models predicting nothing(1:17:45) Where scientists actually agree(1:21:10) Money corrupts, “Climate Scientist” did not exist in the 90's(1:25:10) Speaking for your values without asking you what they are(1:28:00) Gatekeepers holding back the world of science(1:32:20) Stoking terror, stifling science(1:38:30) You'll falsify your own psyche if you falsify your words(1:43:00) Standing your ground, living toward truth   // SUPPORT THIS CHANNEL //Newsletter: https://mailchi.mp/jordanbpeterson.com/youtubesignupDonations: https://jordanbpeterson.com/donate // COURSES //Discovering Personality: https://jordanbpeterson.com/personalitySelf Authoring Suite: https://selfauthoring.comUnderstand Myself (personality test): https://understandmyself.com // BOOKS //Beyond Order: 12 More Rules for Life: https://jordanbpeterson.com/Beyond-Order12 Rules for Life: An Antidote to Chaos: https://jordanbpeterson.com/12-rules-for-lifeMaps of Meaning: The Architecture of Belief: https://jordanbpeterson.com/maps-of-meaning // LINKS //Website: https://jordanbpeterson.comEvents: https://jordanbpeterson.com/eventsBlog: https://jordanbpeterson.com/blog // SOCIAL //Twitter: https://twitter.com/jordanbpetersonInstagram: https://instagram.com/jordan.b.petersonFacebook: https://facebook.com/drjordanpetersonTelegram: https://t.me/DrJordanPetersonAll socials: https://linktr.ee/drjordanbpeterson #JordanPeterson #JordanBPeterson #DrJordanPeterson #DrJordanBPeterson #DailyWirePlus

Simulating Hydrodynamics in Cosmology with CRK-HACC by Nicholas Frontiere et al. on Thursday 24 November We introduce CRK-HACC, an extension of the Hardware/Hybrid Accelerated Cosmology Code (HACC), to resolve gas hydrodynamics in large-scale structure formation simulations of the universe. The new framework couples the HACC gravitational N-body solver with a modern smoothed particle hydrodynamics (SPH) approach called CRKSPH. $underline{text{C}}$onservative $underline{text{R}}$eproducing $underline{text{K}}$ernel $underline{text{SPH}}$ utilizes smoothing functions that exactly interpolate linear fields while manifestly preserving conservation laws (momentum, mass, and energy). The CRKSPH method has been incorporated to accurately model baryonic effects in cosmology simulations - an important addition targeting the generation of precise synthetic sky predictions for upcoming observational surveys. CRK-HACC inherits the codesign strategies of the HACC solver and is built to run on modern GPU-accelerated supercomputers. In this work, we summarize the primary solver components and present a number of standard validation tests to demonstrate code accuracy, including idealized hydrodynamic and cosmological setups, as well as self-similarity measurements. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2202.02840v2

Mesh-free hydrodynamics in PKDGRAV3 for galaxy formation simulations by Isaac Alonso Asensio et al. on Wednesday 23 November We extend the state-of-the-art N-body code PKDGRAV3 with the inclusion of mesh-free gas hydrodynamics for cosmological simulations. Two new hydrodynamic solvers have been implemented, the mesh-less finite volume and mesh-less finite mass methods. The solvers manifestly conserve mass, momentum and energy, and have been validated with a wide range of standard test simulations, including cosmological simulations. We also describe improvements to PKDGRAV3 that have been implemented for performing hydrodynamic simulations. These changes have been made with efficiency and modularity in mind, and provide a solid base for the implementation of the required modules for galaxy formation and evolution physics and future porting to GPUs. The code is released in a public repository, together with the documentation and all the test simulations presented in this work. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12243v1

Simulating Hydrodynamics in Cosmology with CRK-HACC by Nicholas Frontiere et al. on Wednesday 23 November We introduce CRK-HACC, an extension of the Hardware/Hybrid Accelerated Cosmology Code (HACC), to resolve gas hydrodynamics in large-scale structure formation simulations of the universe. The new framework couples the HACC gravitational N-body solver with a modern smoothed particle hydrodynamics (SPH) approach called CRKSPH. $underline{text{C}}$onservative $underline{text{R}}$eproducing $underline{text{K}}$ernel $underline{text{SPH}}$ utilizes smoothing functions that exactly interpolate linear fields while manifestly preserving conservation laws (momentum, mass, and energy). The CRKSPH method has been incorporated to accurately model baryonic effects in cosmology simulations - an important addition targeting the generation of precise synthetic sky predictions for upcoming observational surveys. CRK-HACC inherits the codesign strategies of the HACC solver and is built to run on modern GPU-accelerated supercomputers. In this work, we summarize the primary solver components and present a number of standard validation tests to demonstrate code accuracy, including idealized hydrodynamic and cosmological setups, as well as self-similarity measurements. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2202.02840v2

Mesh-free hydrodynamics in PKDGRAV3 for galaxy formation simulations by Isaac Alonso Asensio et al. on Tuesday 22 November We extend the state-of-the-art N-body code PKDGRAV3 with the inclusion of mesh-free gas hydrodynamics for cosmological simulations. Two new hydrodynamic solvers have been implemented, the mesh-less finite volume and mesh-less finite mass methods. The solvers manifestly conserve mass, momentum and energy, and have been validated with a wide range of standard test simulations, including cosmological simulations. We also describe improvements to PKDGRAV3 that have been implemented for performing hydrodynamic simulations. These changes have been made with efficiency and modularity in mind, and provide a solid base for the implementation of the required modules for galaxy formation and evolution physics and future porting to GPUs. The code is released in a public repository, together with the documentation and all the test simulations presented in this work. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12243v1

Non-linear Eulerian Hydrodynamics of Dark Energy: Riemann problem and Finite Volume Schemes by Linda Blot et al. on Tuesday 11 October Upcoming large-scale-structure surveys can shed new light on the properties of dark energy. In particular, if dark energy is a dynamical component, it must have spatial perturbations. Their behaviour is regulated by the speed of sound parameter, which is currently unconstrained. In this work we present the numerical methods that will allow to perform cosmological simulations of inhomogeneous dark energy scenarios where the speed of sound is small and non-vanishing. We treat the dark energy component as an effective fluid and build upon established numerical methods for hydrodynamics to construct a numerical solution of the effective continuity and Euler equations. In particular, we develop conservative finite volume schemes that rely on the solution of the Riemann problem, which we provide here in both exact and approximate forms for the case of a dark energy fluid. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.04800v1

Non-linear Eulerian Hydrodynamics of Dark Energy: Riemann problem and Finite Volume Schemes by Linda Blot et al. on Tuesday 11 October Upcoming large-scale-structure surveys can shed new light on the properties of dark energy. In particular, if dark energy is a dynamical component, it must have spatial perturbations. Their behaviour is regulated by the speed of sound parameter, which is currently unconstrained. In this work we present the numerical methods that will allow to perform cosmological simulations of inhomogeneous dark energy scenarios where the speed of sound is small and non-vanishing. We treat the dark energy component as an effective fluid and build upon established numerical methods for hydrodynamics to construct a numerical solution of the effective continuity and Euler equations. In particular, we develop conservative finite volume schemes that rely on the solution of the Riemann problem, which we provide here in both exact and approximate forms for the case of a dark energy fluid. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2210.04800v1

A Monte-Carlo based relativistic radiation hydrodynamics code with a higher-order scheme by Kyohei Kawaguchi et al. on Monday 26 September We develop a new relativistic radiation hydrodynamics code based on the Monte-Carlo algorithm. In this code, we implement a new scheme to achieve the second-order accuracy in time in the limit of a large packet number for solving the interaction between matter and radiation. This higher-order time integration scheme is implemented in the manner to guarantee the energy-momentum conservation to the precision of the geodesic integrator. The spatial dependence of radiative processes, such as the packet propagation, emission, absorption, and scattering, are also taken into account up to the second-order accuracy. We validate our code by solving various test-problems following the previous studies; one-zone thermalization, dynamical diffusion, radiation dragging, radiation mediated shock-tube, shock-tube in the optically thick limit, and Eddington limit problems. We show that our code reproduces physically appropriate results with reasonable accuracy and also demonstrate that the second-order accuracy in time and space is indeed achieved with our implementation for one-zone and one-dimensional problems. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.12472v1

Multi-group Radiation Magneto-hydrodynamics based on Discrete Ordinates including Compton Scattering by Yan-Fei Jiang. on Wednesday 14 September We present a formulation and numerical algorithm to extend the scheme for grey radiation magneto-hydrodynamics (MHD) developed by Jiang (2021) to include the frequency dependence via the multi-group approach. The entire frequency space can be divided into arbitrary number of groups in the lab frame, and we follow the time dependent evolution of frequency integrated specific intensities along discrete rays inside each group. Spatial transport of photons is done in the lab frame while all the coupling terms are solved in the fluid rest frame. Lorentz transformation is used to connect different frames. Radiation transport equation is solved fully implicitly in time while the MHD equations are evolved explicitly so that time step is not limited by the speed of light. A finite volume approach is used for transport in both spatial and frequency spaces to conserve radiation energy density and momentum. The algorithm includes photon absorption, electron scattering as well as Compton scattering, which is calculated by solving the Kompaneets equation. The algorithm is accurate for a wide range of optical depth conditions and can handle both radiation pressure and gas pressure dominated flows. It works for both Cartesian and curvilinear coordinate systems with adaptive mesh refinement. We provide a variety of test problems including radiating sphere, shadow test, absorption of a moving gas, Bondi type flows as well as a collection of test problems for thermal and bulk Compton scattering. We also discuss examples where frequency dependence can make a big difference compared with the grey approach. arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.06240v1

Guest: Steve McKinley, Halifax bureau There is an interesting project off the East Coast involving tidal energy that has accomplished something that no previous one has. Sustainable Marine's floating tidal turbine platform PLAT-I 6.40 has connected to the Nova Scotia grid, converting the power of the world's largest tides into electricity. With looming deadlines requiring more green energy from renewable sources, reporter Steve McKinley of the Toronto Star Halifax bureau joins “This Matters” to talk about how tidal energy could be one solution to moving people off fossil fuelled power. This episode was produced by Alexis Green, Matt Hearn and Raju Mudhar.

Returning guest and great friend of TriVelo Brenton Ford from Effortless Swimming is back. Brenton really is a world leader in swim coaching and improvement, with his Effortless Swimming coaching videos amassing millions of views on youtube. He's especially good at tailoring his coaching for triathletes and the age grouper. Today's episode is packed with gems as always as we discuss the biggest patterns Brenton is seeing among triathletes at the moment, the best drills to do in your warm up, sighting, breathing properly, off season training, short vs long intervals and a whole lot more! Timestamp: 00:00 - Introduction 00:18 - Who is Brenton Ford - Effortless Swimming 02:02 - The most common mistake triathletes need to fix 03:47 - Why you should aim to be “front quadrant” 04:55 - Stop leading with your head 06:22 - How to get the right timing in your stroke (sweet spot) 07:42 - Timing is key to improving speed 09:18 - The “Slow to Fast” principle for timing 10:18 - It's not about strength 11:50 - How to know if you're breathing too late 15:00 - How to time breathing in open water with “sighting” 16:57 - Should sighting be part of your pool sessions? 19:38 - Brenton's best starting Breathing Drill 21:53 - Are swim drills really as important as we keep saying 25:15 - Adequate time vs frequency in doing drills 27:45 - Technique matters most 28:57 - Understanding the complexity of Hydrodynamics and reducing drag 31:13 - Buoyancy: How to get yourself higher in the water? 33:56 - Getting your head down to get your legs up 35:15 - Should Endurance and Speedwork be combined? 38:41 - What are the optimal rest periods for different training sessions? 41:38 - Frequency and total volume of swimming throughout the week 45:50 - Discussing the Norwegian way of training 51:54 - Off-Season approach to swim training 53:49 - Brenton and Gerard's advice for overcoming anxiety on race day The Get Fast Podcast is brought to you by TriVelo Coaching, where we help triathletes and cyclists like you, Train Smarter to Race Faster. Your hosts are Australian Triathlon Ironman Champion and HEAD COACH of TriVelo Coaching Gerard Donnelly, and his son Jordan Donnelly. If you want to learn how to TRAIN SMARTER and RACE FASTER, you can join our weekly coaching email, just go to: getfastpodcast.com Some of you might already be in there, but many of you won't be and so this is our official invitation for you to come and join our free community: www.facebook.com/groups/trivelocoaching Check us out on Instagram: https://www.instagram.com/trivelocoaching/ Want access to Gerard's Famous Monthly Coaching Newsletter? Go here: https://www.trivelocoachingprogram.com/memos Disclaimer: The Content in this podcast is in no way intended to be medical advice, treatment or diagnoses. None of our Content is intended to imply that any products mentioned, remedies or information provided are intended to prevent, diagnose, cure or alleviate a disease, ailment, defect or injury or should be used for therapeutic purposes. The Content is intended to assist you with running, cycling, swimming or triathlon and should not be substituted for medical advice by your healthcare professional. We do not accept any liability for any injury, loss, or damage incurred by the use or reliance on our Content. See omnystudio.com/listener for privacy information.

Theoretical Physicist Geoffrey West joins me for a multi-episode series exploring his excellent book "Scale: The Universal Laws of Life, Growth, and Death in Organisms, Cities, and Companies." Be sure to check out NYDIG, one of the most important companies in Bitcoin: https://nydig.com/GUESTGeoffrey's Book: https://www.amazon.com/dp/B010P7Z8J0/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1Geoffrey's Profile: https://www.santafe.edu/people/profile/geoffrey-westPODCASTPodcast Website: https://whatismoneypodcast.com/Apple Podcast: https://podcasts.apple.com/us/podcast/the-what-is-money-show/id1541404400Spotify: https://open.spotify.com/show/25LPvm8EewBGyfQQ1abIsE?si=wgVuY16XR0io4NLNo0A11A&nd=1RSS Feed: https://feeds.simplecast.com/MLdpYXYITranscript:OUTLINE00:00:00 “What is Money?” Intro00:00:08 Sub-Linear and Superlinear Scaling00:05:38 Positive Feedback Loops as Drivers of Super-Linear Scaling00:08:49 Transaction Costs Scaling Sub-Linear to Network Size and Bureaucracy00:13:18 What is the Fractal Architecture of Networks Optimizing For?00:17:43 Structural Integrity as the Limiting Factor on Network Size00:21:55 Hydrodynamics and Gravity as the Limiting Factors on Organism Size00:26:25 The Self-Regulation of Human Population Growth00:30:14 Biology is Replete with Self-Limiting Phenomenon: Is Economics?00:31:43 The Strength of Private Property Rights as Socioeconomic Structural Integrity?00:35:40 Taking a Physicist's Perspective on Biology and Socioeconomics…00:41:47 The Super-Linear Scaling Laws of Cities00:44:11 The Super-Linear “Social Metabolic Rate” and Open-Ended Growth00:48:31 What is the Role of the Individual in Scaling Socioeconomic Systems?00:50:00 NYDIG00:51:08 All Human Rights are Derivatives of Property Rights00:56:10 The Inherent Instability of Human Consensus and Human Hierarchies01:00:24 The Pathologization of Human Hierarchies and Mass-Psychosis01:02:44 Bitcoin and the Exportation of Social Entropy01:07:45 In a World Where Property Rights Were Perfected…01:12:00 Liberalism Used to Mean Low to No Government…SOCIALBreedlove Twitter: https://twitter.com/Breedlove22WiM? Twitter: https://twitter.com/WhatisMoneyShowLinkedIn: https://www.linkedin.com/in/breedlove22/Instagram: https://www.instagram.com/breedlove_22/TikTok: https://www.tiktok.com/@breedlove22?lang=enAll My Current Work: https://linktr.ee/breedlove22​WRITTEN WORKMedium: https://breedlove22.medium.com/Substack: https://breedlove22.substack.com/WAYS TO CONTRIBUTEBitcoin: 3D1gfxKZKMtfWaD1bkwiR6JsDzu6e9bZQ7Sats via Strike: https://strike.me/breedlove22Sats via Tippin.me: https://tippin.me/@Breedlove22Dollars via Paypal: https://www.paypal.com/paypalme/RBreedloveDollars via Venmo: https://venmo.com/code?user_id=1784359925317632528The "What is Money?" Show Patreon Page: https://www.patreon.com/user?u=32843101&fan_landing=trueRECOMMENDED BUSINESSESWorldclass Bitcoin Financial Services: https://nydig.com/Join Me At Bitcoin 2022 (10% off if paying with fiat, or discount code BREEDLOVE for Bitcoin): https://www.tixr.com/groups/bitcoinconference/events/bitcoin-2022-26217Automatic Recurring Bitcoin Buying: https://www.swanbitcoin.com/breedlove/Buy Bitcoin in a Tax-Advantaged Account: https://www.daim.io/robert-breedlove/Buy Your Dream Home without Selling Your Bitcoin with Ledn: https://ledn.io/en/?utm_source=breedlove&utm_medium=email+&utm_campaign=substack

Laura’s research at Queen's combines numerical modeling, remote sensing, and in-situ observational data to offer a more comprehensive understanding of the coastal nearshore environment especially during coastal storm events, such as hurricanes. For upcoming interviews check out the Grad Chap webpage on Queen’s University School of Graduate Stud ies website – https://www.queensu.ca/sgs/grad-chat

Support Topic Lords on Patreon and get episodes a week early! (https://www.patreon.com/topiclords) Lords: * Nick * https://twitter.com/NickPancakes * Greg * https://twitter.com/simgreed * https://store.steampowered.com/app/945490/LittleSquareThings/ Topics: * Anthropomorphized inanimate objects * Quaker Names * https://zeugmalitotes.tumblr.com/post/656465316855119872/fishpilled-these-guys-were-onto-something-i-think * Why do car doors get Shitty Shut * Go West - Call Me * https://www.youtube.com/watch?v=AV0ugZumyJU * What's on the grill if you're "grillin up some 'good boys'" * Overly complicated navel-gazing plots in video games, especially those that absolutely do not need plots Microtopics: * Completing the set of Duckfeed guests. * Health care simulation. * The moth having himself a journey. * Hydrodynamics of the bloodstream. * Little Square Things. * Filling your life with media about anthropomorphized inanimate objects. * Whether Data needs hair. * Giving your shiny yellow skin for legal reasons. * A talking garage that is hungry for cars. * Does that anthropomorphic talking chair even eat ass? * A talking map of the United States. * Whether someone already mentioned the talking photo booth. * Clocky the talking map. * The "marry it" joke. * Cortana receiving your one-star review of trying to rename this folder. * Preserved Fish. * Morris Morris, Jr. * Experience Burt Merrick. * Preserved Fish writing his own Wikipedia page. * Signing in to leave a flower. * Leaving a Blingee on your ancestor's grave. * A door that is shut but it's not flush with the doorway and the "door ajar" alarm goes off. * A car upgrade where if you partially close the door it closes it the rest of the way for you. * Why don't they make two planes out of the black box material, one on top of the other. * A car door that is in many respects shut. * Go back to sleep and wake up properly, dipshit. * Trying to make Shitty Shut happen with Gen Z by getting on TikTok and using a filter that makes you look young and doing meme dances. * Teaching your three year old to call it "shitty shut" and when grownups tell him he shouldn't use the word "shitty," whispering from the bushes "yes you should!" * Euphemism withdrawal. * Steadfastly refusing to swear but still calling it a shitpost because that's what you call it. * The clip art dude sailing across the screen. * Doing one dance and your shadow doing a slightly different dance. * Reshooting a scene but keeping the same shadows as before. * Pop quiz: sideburn on only one side of the face, or slept on a greasy bench? * An entertaining slow watch. * A fire hydrant made of a pie tin and aluminum foil. * Singing into a fan. * Everybody realizing that there is someone on the ceiling. * The Gentle Exorcist. * A sheriff labeled "boy." * A drug store full of a band. * The additional challenge of a mechanical bull mounted upside down on the ceiling. * Figuring out how to do a special effects shot for a story moment and then deciding to put the effect in every other shot regardless of whether it makes sense. * Watching a 40 year old music video and then tracking down the director and asking if you win a prize for being the first to notice a specific joke. * The falling yellow liquid spilling forth within the billiards bar. * Go low, Ken and sons. * Whether people say that they have some "bad" "boys" on the "grill," why don't you "pop" on "over." * The thing where you carve a hot dog into an octopus shape. * A hot dog that is too polite to burst if you put it in the microwave. * Why every dog is a "good boy" but none of them are great. * The Go West Music Video Cinematic Universe. * Bad boys who are also bad dancers. * The Ultimate Good Boy. * Running out the time rewind potion. * A puzzle game with story except for the enormous lore dump at the end. * Bob's Game. * Being really into the story of the development of Bob's Game except for all the pain and human suffering. * ARGeez. * Renaming your game to "OK" so nobody can search for it.

The Jewish people cross the Jordan River in the same month as they had crossed the Red Sea, but the miracle God performed is completely different, as explained by Rabbi Moshe Lichtman. For more, please visit www.TheIsraelBible.com

Bjørn Haugland is the co-founder and Chief Executive Officer of SKIFT Business Climate Leaders (https://www.skiftnorge.no/english), a Norwegian business-led climate initiative with a mission to accelerate the transition to a low-carbon economy and support the government in delivering on its national climate commitments by 2030. The coalition hopes to demonstrate, to businesses and the government, the business potential that exists in the low-carbon economy and help drive the transition. Mr. Haugland is the former Executive Vice President and the Chief Sustainability Officer in DNV GL Group where he oversaw the groups sustainability performance and drove company-wide sustainability initiatives. Mr. Haugland has extensive experience assisting multinational companies in areas such as corporate sustainability, innovation and business development. He was responsible for the Global Opportunity Report, a joint initiative together with UN Global Compact and Sustainia, a fact-based sustainability consulting and communication firm. Mr. Haugland is today a board member at the University of Bergen, WWF, The Peace Research Institute Oslo (PRIO), Sporveien and Kezzler. He is also member of the advisory Board for Centre for Responsible Leadership. He is co-founder of Zeabuz, a new service for urban, emission free, autonomous ferries and Terravera, a tech foundation to make sustainability a reality by giving anyone insights to support their everyday decisions. He is member of the The Norwegian Board of Technology (NBT) that advises the Norwegian Parliament and Government on new technology as well as a member of Norwegian Academy of Technological Sciences. Mr. Haugland has a M.Sc. in Naval Architecture – Marine Structures and Hydrodynamics, from The Norwegian Institute of Technology and attended the “Strategic International Leadership” program at International Institute for Management Development (IMD) and "Leading Digital Transformation" (INSEAD). Mr. Haugland is widely recognized in the global debate on sustainability and technology and he has his own blog on the Huffington Post and he is regularly writing articles for Recharge, Teknisk Ukeblad and Sysla Maritime.

What is hydrodynamics and why does it apply over 20 orders of magnitude in energy and length. Welcome, Prof Julia Yeomans FRS, Head of Rudolf Peierls Centre for Theoretical Physics Why Hydrodynamics? Prof Steve Simon

Holography explains why black hole horizons have thermodynamic and hydrodynamic properties and inspires researchers to re-visit foundations and explore limits of relativistic hydrodynamics Since the work of Bekenstein, Hawking and others in the early 1970s, it was known that the laws of black hole mechanics are closely related if not identical to the laws of thermodynamics. A natural question to ask, then, is whether this analogy or the correspondence extends beyond the equilibrium state. The affirmative answer, given by various authors during the 1980s and 90s, became known as the "black hole membrane paradigm". It was shown that black hole horizons can be viewed as being endowed with fluid-like properties such as viscosity, thermal conductivity and so on, whose values remained mysterious. The development of holography 15-20 years ago clarified many of these issues and has led to the quantitative correspondence between Navier-Stokes and Einstein equations. It became possible to study the long-standing problems such as thermalization and turbulence by re-casting them in the dual gravity language. We review those developments focusing, in particular, on the issue of the "unreasonable effectiveness" of hydrodynamic description in strongly interacting quantum systems. Final remarks, Prof Julia Yeomans FRS, Head of Rudolf Peierls Centre for Theoretical Physics

Can we apply hydrodynamics to systems with extensively many conservation laws Can we apply hydrodynamics to systems with extensively many conservation laws

Become a Paddling SUPPORTER for only $3/month This episode of the Dropping In Surf Show features Mark Buetzow, veteran ship designer, sailor and water-skier. Rob and Mark discuss various hydrodynamic designs, different types of drag, forms of propulsion, and design spirals. Mark had a knack for understanding surfing, despite never surfing in his life - it's fascinating to hear what a natural he is. Must be something to hydrodynamics! Watch the video of this episode at https://www.surfingpaddling.com/dropping-in-surf-show

Dropping In Surf Show, Episode 23 features Mark Buetzow, veteran ship designer, sailor and water-skier.  Rob and Mark discuss various hydrodynamic designs, different types of drag, forms of propulsion, and design spirals.  Mark had a knack for understanding surfing, despite never surfing in his life - it’s fascinating to hear what a natural he is.  Must be something to hydrodynamics!

Gauge/Gravity Duality 2013

Gauge/Gravity Duality 2013

In 2015, after 8 years of research and achieving his PhD, Markus Ihmsen together with his research colleague Jens Cornelis founded the company FIFTY2 Technology which is a constantly growing start-up and think tank for world class researchers and engineers. The company's vision: Transforming the engineering process allowing to craft sustainable, more innovative and safer products at lower costs while pushing the boundaries of simulation possibilities. The first product, PreonLab, is a particle-based simulation software for free-surface fluids which is unique in its ease of use, high performance and visualization capabilities. PreonLab is productively used by more than 50 companies in 12 countries. ————————————————————————————— Connect with me here: ✉️ My weekly email newsletter: jousef.substack.com

Episode: 1938 Three M-names help us to understand air: Meeting the Zeitgiest.  Today, we learn what air is made of.

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2020.09.25.310755v1?rss=1 Authors: Lastra, L., Nguyen, M., Farajpour, N., Freedman, K. J. Abstract: Despite the highly negatively charged backbone of DNA, electroosmotic flow (EOF) within a nanopore can lead to DNA travelling opposite to electrophoretic force at low ionic strengths. However, EOF-pumping and its role in producing current-enhancing events is ambiguous and debated due to the complicated interactions between nanopore walls, DNA grooves, ion mobility, and counterion clouds. Here, we discuss how current-enhancing DNA events could be the result of a flux imbalance between anions and cations. The contributing factors for driving a flux imbalance within a nanopore include pore size, voltage bias, and type of alkali chloride electrolyte. Once the mechanism behind conductive events is established, the physics of transducing a DNA translocation into an electrical signal can be further exploited for improving DNA sequencing and, more broadly, bio-sensing. Copy rights belong to original authors. Visit the link for more info

Episode: 3243 Hollywood's Heroic Water FX.  Today, water effects.

In this summer series of podcasts, we introduce you to the winners of our Teledyne Marine Academic Grant for 2020. This grant offers universities and institutions the opportunity to utilize several of our flagship products free of charge for up to a six-month period to support their research programs. In this episode we meet Christian Armstrong. Christian is a PhD candidate and student researcher working with a team from the Scottish Association for Marine Science (SAMS). Christian and the team are investigating the physical stability of the seabed around the UK continental shelf in the extremely energetic tidal flows of western Scotland. Due to the operational challenges posed by the area’s hydrodynamics, few studies have been conducted there. However, these regions are now receiving research attention due to their value for renewable energy and the insights into turbulent flows that they can bring. If you're interested in learning more about Christian's work or receiving updates on his team's research project this summer, follow him on Twitter.

In episode two of our Case Study series, we take a deeper dive into the mysterious world of displacement hulls by learning more about hull lord, Greg Liddle and what is now Liddle Designs. Greg Liddle is a very private person and recently retired from shaping. Luckily his friend and business partner, Kirk Putnam is keeping Liddle surfboards moving by recreating replicas of Greg Liddle's boards with Scott Anderson of Anderson Surfboards and Aquatech Glassing based out of Hermosa Beach, California. Greg's hull designs have been slowly refined over the course of 50 years and most people in the surfing community would agree that he shapes some of the best displacement hulls around. There isn't necessarily a strict definition of what a displacement hull is but they generally have a deeply rolled, convex bottom contour, wide point forward, pulled in tail, very knifey rails, and a s-deck. Displacement Hulls are just one style that exists in the vast universe of surfboard designs; that being said, it is cool to see a design make it through 50 years as there are not many designs that hold the surfing community's interest for that length of time while holding true to it's design characteristics. Granted displacement hulls surfers make up a small yet die hard sub set of surf culture. The generally promote fast, down the line surfing with ease, style, and grace. We look forward to seeing this design continuing to spread beautiful surfing throughout surfing's future.

Just another day with legendary surfboard builder Marc Andreini dropping tons of knowledge on surf history and design theory....Marc Andreini is one of the highest regarded surfboard builders living today. His shaping career has spanned across many generations as surfboard design has evolved from 60's D-Fins to modern day shortboards. Andreini has watched how surfboard concepts and designs have changed over the lifespan of his career and he ties in plenty of great stories to help breakdown the complexities of hydrodynamic theories and their relation to shaping. Marc is an incredible business person, surfer, and mentor, he knows that it is imperative to pass down information to generations to come. We hope that you enjoy Andreini's conversations and take away many surf history and design lessons. Below is a brief outline of the podcast:0:00 Intro1:00 Going Surfing with Marc: The McVee, Edge Bottoms, Rolled Bottom Contours, and Power Blade Fins7:30 Back at Marc's House: Fins and Surfboard Design Through the Transition Era 15:15 Surfing in the 70's19:20 Surfboard Design: Hydrodynamics + Trial and Error25:25 Whats in Andreini's Shaping Bay: Dave Rastavitch's Edge Gun, Greenough's Templates, Greg Liddle's Planer35:50 Marc's New Book: The Gift 40:05 Fin Progression from Tom Blake and George Greenough to Modern Day Thrusters53:40 Final Thoughts on Board Building

Gudrun ist für die aktuelle Episode zu Gast in der Bundesanstalt für Wasserbau (BAW) am Standort in Karlsruhe. Die BAW ist etwa so alt wie die Bundesrepublik und grob gesagt zuständig für technisch-wissenschaftliche Aufgaben in allen Bereichen des Verkehrswasserbaus an den Bundeswasserstraßen und für Spezialschiffbau. Dabei berät sie die Wasserstraßen- und Schifffahrtsverwaltung des Bundes (WSV). Heute ist der Hauptsitz der BAW in Karlsruhe. Daneben gibt es noch einen Standort in Hamburg. Der Anlass des Besuches ist diesmal der Abschluss der Masterarbeit von Axel Rothert zu einer Fragestellung aus der BAW in Karlsruhe. Der Titel der Arbeit ist "Hybride 2D-3D-Simulation von Strömungsprozessen im Nah- und Fernfeld von Wasserbauwerken in OpenFOAM". Sie entstand in enger Zusammenarbeit mit den Kollegen Dr.-Ing. Carsten Thorenz und Franz Simons im Referat Wasserbauwerke der BAW. Nach dem Abschlussvortrag hat sich Gudrun mit Franz Simons und Axel Rothert über die Ergebnisse der Arbeit unterhalten. Neben traditionellen mathematischen Modellen, die durch physikalische Experimente kalibriert und erprobt werden, haben sich durch den technischen Fortschritt der letzen Jahrzehnte numerische Simulationen inzwischen fest etabliert. Einerseits, um numerische Näherungslösungen für die partiellen Differentialgleichungen des mathematischen Modells zu liefern, andererseits aber auch zur Durchführung virtueller Experimente. Die Simulation von hydrodynamischen Vorgängen ist hier ein gutes Beispiel. Das Fließen von Wasser muss mit Gleichungen beschrieben werden, die wiederum numerische Lösungen brauchen, wobei durch deren Komplexität auch gleich noch Ansprüche an entweder Hochleistungsrechentechnik (und damit Parallelisierung) oder andererseits gut begründete Vereinfachungen erhoben werden müssen. Das ganze muss verlässliche Aussagen liefern, damit die BAW z.B. die Hochwasserneutralität eines Wasserbauwerks garantieren kann bevor es endgültig geplant und gebaut wird. Dabei werden in der dortigen Praxis beide Wege beschritten: man investiert in modernste Rechentechnik und benutzt erprobte Vereinfachungen im Modell. Im Kontext der Umströmung von Wasserbauwerken haben unterschiedliche Regionen verschiedene dominierende Strömungsprozesse: in der Nähe des Bauwerkes gibt es eine starke Interaktion des Fließgewässers mit dem Hindernis, aber in einiger Entfernung kann man diese Interaktion vernachlässigen und den Modellansatz vereinfachen. Deshalb sollten im Nah- und Fernbereich unterschiedliche Modelle benutzt werden. Konkret sind es in der Arbeit die tiefengemittelten Flachwassergleichungen im Fernfeld und die Reynolds-gemittelten Navier- Stokes-Gleichungen (RANS) im Nahfeld der Wasserbauwerke. Wichtig ist dann natürlich, wie diese Modelle gekoppelt werden. Da eine Informationsübertragung sowohl stromaufwärts als auch stromabwärts möglich ist, ist eine Kopplung in beide Richtungen nötig. In der vorliegenden Arbeit wurde eine vorhandene Implementierung eines Mehr-Regionen-Lösers in OpenFOAM der TU München so weiter entwickelt, dass er für die Anwendungen in der BAW geeignet ist. Dafür musste sie auf die aktuell an der BAW verwendete Version von OpenFOAM portiert und anschließend parallelisiert werden, damit praxisnahe Probleme der BAW in sinnvollen Rechenzeiten bewältigt werden können. Außerdem mussten die Implementierungen der Randbedingungen so abgeändert werden, dass allgemeine Geometrien für den Untergrund und ein trocken fallen bzw. benetzen mit Wasser möglich sind. Die Implementierung wurde anhand eines realistischen Beispiels aus dem Verkehrswasserbau bestätigt. Ein etwa 1,1km langer Flussabschnitt wurde hybrid simuliert. Dabei ist ein Staustufe, bestehend aus Wehranlagen, Schleuse und Kraftwerk enthalten. Literatur und weiterführende Informationen Boyer, F. ; Fabrie, P.: Mathematical Tools for the Study of the Incompressible Navier-Stokes Equations and Related Models. New York : Springer-Verlag, 2013 Gerstner, N. ; Belzner, F. ; Thorenz, C.: Simulation of Flood Scenarios with Combined 2D/3D Numerical Models. In: Lehfeldt, R. (Hrsg.) ; Kopmann, R. (Hrsg.): 11th international conference on hydroscience and engineering. Bundesanstalt für Wasserbau, Karlsruhe, 2014 Mintgen, F.: Coupling of Shallow and Non-Shallow Flow Solvers - An Open Source Framework. München, Technische Universität, Diss., 2017 Mintgen, F. ; Manhart, M.: A bi-directional coupling of 2D shallow water and 3D Reynolds-Averaged Navier-Stokes models. 2018. Begutachtet und angenommen vom Journal of Hydraulic Research. Einsehbar: DOI: 10.1080/00221686.2017.1419989 Uijttewaal, W. S.: Hydrodynamics of shallow flows: application to rivers. In: Journal of Hydraulic Research 52 (2014), Nr. 2, S. 157-172 Podcasts R. Kopman, G. Thäter: Wasserstraßen, Gespräch im Modellansatz Podcast, Folge 24, Fakultät für Mathematik, Karlsruher Institut für Technologie (KIT), 2014.

For the season two pilot Paul takes you inside the project judging room to listen to the 4-H Gator’s Grokking Gizmos project presentation at the Utah South FLL State Championship during the 2017-18 Hydrodynamics season.

Bryan Poulsen has served as a head referee for the past four years at regional and statewide FLL competitions. He gives back because he loves paying it forward, a principle he learned as a national officer in Future Business Leaders of America. Paul and Bryan share how FLL robotics teams can plan winning strategies in the robot game.  

Curtis Larsen, Computer Science Professor at Dixie State University, has been a FLL coach for 7 seasons, FTC coach for 2 seasons, 4-H volunteer club leader for robotics and computer science clubs for 5 years. Curtis and Paul debrief the 2017-18 HYDRODYNAMICS season.

The shape of an animal is a reflection of the way it interacts with the physical world around it. By studying the mechanical laws which influence the evolution of modern animals, we can better understand the lives of their ancestors. Hydrodynamics examines the movement of water in contact with an organism, and can include everything from body shape to blood flow. In this episode we spoke to Dr Tom Fletcher, University of Leicester, about hydrodynamics in palaeontology, and his research looking at fossil fishes and modern sharks. Tom and others have published a paper on the hydrodynamics of fossil fishes, and he continues to work on the biomechanics of fossil animals.  

Randy and Jim discuss a physical analogy to quantum mechanics consisting of a droplet of fluid bouncing off of the waves in a similarly composed fluid that were generated by the droplet's own bounces. The analogy is very close to the de Broglie-Bohm interpretation of quantum mechanics. Show notes: http://frontiers.physicsfm.com/5

The first case of a human falling ill from cancer cells contracted from a parasitic tapeworm has been reported in Columbia. And in an unrelated story, a Californian man has had a live tapeworm removed from his brain in a potentially life-saving operation. The Rosetta probe orbiting 67P/Churyumov–Gerasimenko has surprised everyone by detecting large amounts of molecular oxygen on the comet. The finding suggests molecular oxygen was present when the comet was formed soon after the birth of the solar system, 4.6 billion years ago. Stanford University researchers have discovered how jellyfish actually swim – and it's not how previously thought. They make a region of low pressure ahead of themselves, essentially sucking themselves forward. Lucas mentions Smarter Every Day's video of a balloon in a car.

This episode discusses the Born-Infeld model for Electromagnetodynamics. Here, the standard model are the Maxwell equations coupling the interaction of magnetic and electric field with the help of a system of partial differential equations. This is a well-understood classical system. But in this classical model, one serious drawback is that the action of a point charge (which is represented by a Dirac measure on the right-hand side) leads to an infinite energy in the electric field which physically makes no sense. On the other hand, it should be possible to study the electric field of point charges since this is how the electric field is created. One solution for this challenge is to slightly change the point of view in a way similar to special relativity theory of Einstein. There, instead of taking the momentum () as preserved quantity and Lagrange parameter the Lagrangian is changed in a way that the bound for the velocity (in relativity the speed of light) is incorporated in the model. In the electromagnetic model, the Lagrangian would have to restrict the intensity of the fields. This was the idea which Borne and Infeld published already at the beginning of the last century. For the resulting system it is straightforward to calculate the fields for point charges. But unfortunately it is impossible to add the fields for several point charges (no superposition principle) since the resulting theory (and the PDE) are nonlinear. Physically this expresses, that the point charges do not act independently from each other but it accounts for certain interaction between the charges. Probably this interaction is really only important if charges are near enough to each other and locally it should be only influenced by the charge nearest. But it has not been possible to prove that up to now. The electrostatic case is elliptic but has a singularity at each point charge. So no classical regularity results are directly applicable. On the other hand, there is an interesting interplay with geometry since the PDE occurs as the mean curvature equation of hypersurfaces in the Minkowski space in relativity. The evolution problem is completely open. In the static case we have existence and uniqueness without really looking at the PDEs from the way the system is built. The PDE should provide at least qualitative information on the electric field. So if, e.g., there is a positive charge there could be a maximum of the field (for negative charges a minimum - respectively), and we would expect the field to be smooth outside these singular points. So a Lipschitz regular solution would seem probable. But it is open how to prove this mathematically. A special property is that the model has infinitely many inherent scales, namely all even powers of the gradient of the field. So to understand maybe asymptotic limits in theses scales could be a first interesting step. Denis Bonheure got his mathematical education at the Free University of Brussels and is working there as Professor of Mathematics at the moment. Literature and additional material M. Kiessling: Electromagnetic Field Theory Without Divergence Problems 1, The Born Legacy, Journal of Statistical Physics, Volume 116, Issue 1, pp 1057-1122, 2004. M. Kiessling: Electromagnetic Field Theory Without Divergence Problems 2, A Least Invasively Quantized Theory, Journal of Statistical Physics, Volume 116, Issue 1, pp 1123-1159, 2004. M. Kiessling: On the motion of point defects in relativistic fields, in Quantum Field Theory and Gravity, Conceptual and Mathematical Advances in the Search for a Unified Framework, Finster e.a. (ed.), Springer, 2012. Y. Brenier: Some Geometric PDEs Related to Hydrodynamics and Electrodynamics, ICM Vol. III pp 761--772, 2002.

This episode discusses the Born-Infeld model for Electromagnetodynamics. Here, the standard model are the Maxwell equations coupling the interaction of magnetic and electric field with the help of a system of partial differential equations. This is a well-understood classical system. But in this classical model, one serious drawback is that the action of a point charge (which is represented by a Dirac measure on the right-hand side) leads to an infinite energy in the electric field which physically makes no sense. On the other hand, it should be possible to study the electric field of point charges since this is how the electric field is created. One solution for this challenge is to slightly change the point of view in a way similar to special relativity theory of Einstein. There, instead of taking the momentum () as preserved quantity and Lagrange parameter the Lagrangian is changed in a way that the bound for the velocity (in relativity the speed of light) is incorporated in the model. In the electromagnetic model, the Lagrangian would have to restrict the intensity of the fields. This was the idea which Borne and Infeld published already at the beginning of the last century. For the resulting system it is straightforward to calculate the fields for point charges. But unfortunately it is impossible to add the fields for several point charges (no superposition principle) since the resulting theory (and the PDE) are nonlinear. Physically this expresses, that the point charges do not act independently from each other but it accounts for certain interaction between the charges. Probably this interaction is really only important if charges are near enough to each other and locally it should be only influenced by the charge nearest. But it has not been possible to prove that up to now. The electrostatic case is elliptic but has a singularity at each point charge. So no classical regularity results are directly applicable. On the other hand, there is an interesting interplay with geometry since the PDE occurs as the mean curvature equation of hypersurfaces in the Minkowski space in relativity. The evolution problem is completely open. In the static case we have existence and uniqueness without really looking at the PDEs from the way the system is built. The PDE should provide at least qualitative information on the electric field. So if, e.g., there is a positive charge there could be a maximum of the field (for negative charges a minimum - respectively), and we would expect the field to be smooth outside these singular points. So a Lipschitz regular solution would seem probable. But it is open how to prove this mathematically. A special property is that the model has infinitely many inherent scales, namely all even powers of the gradient of the field. So to understand maybe asymptotic limits in theses scales could be a first interesting step. Denis Bonheure got his mathematical education at the Free University of Brussels and is working there as Professor of Mathematics at the moment. Literature and additional material M. Kiessling: Electromagnetic Field Theory Without Divergence Problems 1, The Born Legacy, Journal of Statistical Physics, Volume 116, Issue 1, pp 1057-1122, 2004. M. Kiessling: Electromagnetic Field Theory Without Divergence Problems 2, A Least Invasively Quantized Theory, Journal of Statistical Physics, Volume 116, Issue 1, pp 1123-1159, 2004. M. Kiessling: On the motion of point defects in relativistic fields, in Quantum Field Theory and Gravity, Conceptual and Mathematical Advances in the Search for a Unified Framework, Finster e.a. (ed.), Springer, 2012. Y. Brenier: Some Geometric PDEs Related to Hydrodynamics and Electrodynamics, ICM Vol. III pp 761--772, 2002.

Professor Paul Taylor, University of Oxford gives a short talk as part of the 41st Maurice Lubbock lecture series in the Department of Engineering Science.

Professor Paul Taylor, University of Oxford gives a short talk as part of the 41st Maurice Lubbock lecture series in the Department of Engineering Science.

This question deals with both hydrostatics and hydrodynamics. A 4.0cm diameter horizontal pipe connects passes through a freshwater dam at a depth of 6.0 meters and is sealed by a plug. A) Find the magnitude of the frictional force between a plug and the pipe wall? B) With the plug removed what volume of water exits the pipe in 3.0h?

Lecture 6 in a series of 21 lectures on solid state physics, delivered by Professor Steven H. Simon in early 2014.

Lecture 7 in a series of 21 lectures on solid state physics, delivered by Professor Steven H. Simon in early 2014.

In der vorliegenden Dissertation werden Eigenschaften stark gekoppelter hydrodynamischer Theorien untersucht, die mittels einer dualen Beschreibung als höherdimensionale gravitative Systeme aufgefasst werden können. Besonderes Augenmerk liegt hierbei auf der Berechnung physikalischer Größen wie Viskositäten oder Diffusionskonstanten. Diese werden hinsichtlich der Frage betrachtet, ob sie allgemeingültigen, universellen Gesetzmäßigkeiten folgen, die man aus der Beschreibung mittels einer Gravitationstheorie ableiten kann. Die theoretische Grundlage bildet hierbei die Dualität konformer Quantenfeldtheorien im Minkowski Raum und höherdimensionaler Stringtheorien im Anti-de Sitter Raum, die AdS/CFT Korrespondenz. Einen besonders interessanten Grenzfall stellt der Limes starker Kopplung und hoher Anzahl von Freiheitsgraden der konformen Feldtheorie dar, in dem sich die duale Beschreibung zu klassischer Gravitationstheorie im AdS Raum vereinfacht. Mittels störungstheoretischer Betrachtung der Fluktuationen von Schwarzen Loch Lösungen der Gravitationstheorie lassen sich universelle hydrodynamische Eigenschaften der stark gekoppelten Feldtheorie beschreiben. Eines der Hauptergebnisse dieses Forschungsgebietes ist der Nachweis, dass Fluide, die durch eine einfache duale Gravitationstheorie mit ungebrochener Rotationsinvarianz beschrieben werden können, ein universelles Verhältnis aus Scherviskosität und Entropiedichte besitzen. Erstaunlicherweise stimmt dieses Verhältnis parametrisch mit dem gemessenen Wert des stark gekoppelten Quark-Gluonen-Plasmas überein, ohne dass eine direkte Beschreibung dieser QCD Phase momentan möglich ist. In der vorliegenden Arbeit wird die Konstruktion eines ähnlichen, universellen Zusammenhangs beschrieben. In der hydrodynamischen Beschreibung supersymmetrischen Feldtheorien existiert eine Diffusionskonstante, die, ähnlich der Scherviskosität, den spurfreien Teil der Konstitutivgleichung des Supersymmetriestroms beschreibt. Wir berechnen diese Konstante in supersymmetrischen Theorien allgemeiner Dimension mittels verschiedener unabhängiger Rechnungen. Dazu betrachten wir als duale Gravitationstheorie eine generische Supergravitationstheorie. Die Bewegungsgleichung des zum Supersymmetriestrom dualen Gravitinos in Schwarzen Loch Hintergründen wird gelöst und erlaubt die Berechnung der retardierten Greenschen Funktion des Supersymmetriestroms der Feldtheorie. Diese besitzt einen Pol, der die charakteristische Schalldispersionsrelation des Phoninos beschreibt, des Goldstonefermions spontan gebrochener Supersymmetrie aufgrund endlicher Temperatur. In dieser Dispersionsrelation findet sich die besagte Diffusionskonstante, die sich auch mittels einer neuartigen Kubo-Formel direkt aus der Greenschen Funktion berechnen lässt. Das Hauptergebnis der Arbeit bildet hierbei die Etablierung eines Zusammenhangs dieser Diffusionskonstante und eines universell gültigen Absorptionsquerschnitts auf der dualen Seite der Gravitationstheorie, der die Absorption von Spinoren von einem Schwarzen Loch Hintergrund beschreibt. Eine weitere bedeutende Entwicklung besteht in der Entdeckung eines neuartigen Transportkoeffizienten, der einen beobachtbaren induzierten Strom aufgrund der Vortizität eines Fluids beschreibt. Dieser stellt die klassische Manifestation eines quantenmechanischen Effektes dar, der entsteht, wenn die zugrunde liegende mikroskopische Theorie eine quantenmechanische chirale Anomalie aufweist. Wir untersuchen diesen Effekt mithilfe eines theoretischen Ansatzes, der verschiedene Zugänge zum Verhältnis von Hydrodynamik und Gravitation miteinander vereint. Dazu werden rotierende D3-Branen effektiv als asymptotisch flache Verallgemeinerungen von fünf-dimensionalen AdS Reissner-Nordström Schwarzen Löchern beschrieben. Die Fluktuationen dieses Hintergrundes beschreiben nun eine effektive hydrodynamische Theorie auf einer Fläche in festem Abstand zur Singularität des Schwarzen Lochs, auf der die Fluktuationen Dirichlet Randbedingungen annehmen. Diese Herangehensweise erlaubt es uns den erwähnten Quanteneffekt nicht nur am Rand des AdS Raums zu betrachten, sondern auch am Horizont des Schwarzen Lochs, auf jeder Fläche mit konstantem Radius dazwischen oder sogar im asymptotisch flachen Raum.

Liverpool, T (University of Bristol) Friday 12 April 2013, 10:00-11:00

Forest, G (University of North Carolina ) Wednesday 09 January 2013, 11:50-12:30

Um Galaxien, Galaxienhaufen oder noch größere Strukturen im Universum detailliert zu simulieren, benötigt man eine korrekte Simulation des in diesen Objekten vorhandenen Gases. Eine Möglichkeit zur Simulation dieses Gases bietet das etablierte Verfahren ``Smoothed Particle Hydrodynamics (SPH)''. Diese Methode empfiehlt sich besonders wegen ihrer intrinsischen geometrischen Flexibilität und ihrer adaptiven Auflösung. Neuere Untersuchungen zeigten aber, dass SPH in Situationen, in denen große Dichtesprünge auftreten, ungenau wird. Hier kann es zu einem unphysikalisch verlangsamten Wachstum von hydrodynamischen Instabilitäten kommen. Diese Probleme von SPH können vor allem auf systematisch bedingte Ungenauigkeiten in der Dichtebestimmung dieser Methode zurückgeführt werden. Um diese Probleme zu vermeiden, haben wir eine neue ``Voronoi Particle Hydrodynamics'' (VPH) genannte Methode enwickelt, um die Hydrodynamik zu simulieren. Dabei wird die Dichte der Simulationsteilchen mit Hilfe eines zusätzlichen Gitters bestimmt. Dieses Gitter ist eine Voronoi Pflasterung, die auf auf den Positionen der Teilchen basiert. Mit Hilfe dieses Prinzips können hydrodynamische Instabilitäten korrekt simuliert werden. Situationen, in denen Scherströmungen entlang großer Dichtesprünge auftreten und zu hydrodynamische Instabilitäten führen, sind besonders ungünstig für SPH, da es hier zu großen Ungenauigkeiten kommen kann. Eine Anwendung, in der solche Situationen zu erwarten sind, ist der Einfall einer Galaxie in einen Galaxienhaufen. Dabei verliert die Galaxie aufgrund des anströmenden Galaxienhaufen-Gases zunehmend Gas an den Galaxienhaufen. Da SPH aufgrund seiner Dichtebestimmung diesen Prozess nicht korrekt simuliert, ermittelt SPH einen zu geringen Verlust von Gas. Wir konnten dies mit Hilfe unserer Simulationen belegen. Wir haben diese Resultate sowohl mit Simulationen von Galaxien, die in einen Galaxienhaufen fallen, als auch mit kosmologischen Simulationen von sich bildenden Galaxienhaufen überprüft. Dort bestätigte sich, dass in SPH der Gasverlust der einfallenen Galaxien zu gering ist. Desweiteren ist der Gasverlust in den AREPO Simulationen stets am höchsten, während VPH eine mittlere Stellung einnimmt. Wir konnten ingesamt zeigen, dass VPH in Situationen mit großem Dichtekontrast eine Verbesserung zu SPH darstellt. Auch wenn unsere Resultate keine vollständige Übereinstimmung mit dem Gitter-basierten AREPO Code zeigen, stellen sie doch eine wichtige Annährung zwischen Teilchen- und Gitter-basierten hydrodynamischen Verfahren dar. VPH empfiehlt sich vor allem als eine gegenüber SPH verbesserte Methode zur Simulation von hydrodynamischen Prozesssen in kosmologischen Problemen.

Mehats, F (Rennes 1) Tuesday 14 December 2010, 14:00-15:00

Dam Son shows that a hitherto discarded term in the conserve current is not only allowed by symmetries, but is in fact required by triangle anomalies and the second law of thermodynamics.

This talk characterizes the hydrodynamics of liquid crystal systems and examines fluctuations in bulk systems.

This presentation discusses the equations of active hydrodynamics, the viscosity of polar systems, and the spontaneous flow of polar and non-polar systems.

This presentation discusses the movement of swimming cells. The effects of interaction between the flagella of different cells and the effects of wave geometry are also discussed.

This presentation discusses the various chemical signals and gradients that play a role in the swimming motion of E. coli cells.

Dr. Yassir T. Makkawi (Chemical Engineering & Applied Chemistry, Aston University) Tuesday 6 January 2009, 14.50-15.15

William Fleenor, UC Davis Center for Watershed Sciences, presents an initial assessment of the salinity implications of four strategies for managing delta water exports. He also explores the impacts on salinity due to two main changes to the Delta over the past century: One to three feet of sea level rise and increased island flooding.

Hydrodynamische Simulationen haben sich in den letzten Jahren zu einem wichtigen Werkzeug in der Kosmologie entwickelt. Es ist Ziel dieser Arbeit, einen bestehenden Simulationscode durch weitere physikalische Effekte zu erweitern, um deren Auswirkungen in selbstkonsistenter Art und Weise untersuchen zu können. Es wird ein Formalismus vorgestellt, der die Wärmeleitung in einem heißen, diffusen Plasma nachgebildet. Ferner präsentiere ich eine neuartige Methode, kosmische Teilchenstrahlung durch ein als einfach parametrisiert angenommenes Impulssprektrum der Strahlungsteilchen in hydrodynamischen Simulationen mitsamt ihren dynamischen Effekten zu berücksichtigen und untersuchen. Es zeigt sich in durchgeführten Simulationen, daß die Wärmeleitung, obwohl sie unter bestimmten Umständen die Kühleffekte ausgleichen kann, in den durchgeführten kosmologischen Simulationen nicht zu einer Reduzierung der Akkretionsrate in Galaxienhaufen führte. Es zeigen sich dennoch in Temperatur- und Strahlungsprofilen der simulierten Objekte starke Auswirkungen der Wärmeleitung. Die kosmische Teilchenstrahlung zeigt in weiteren Simulationen deutliche Auswirkungen auf die Evolution von Strukturen, insbesondere bei der Regulierung von Sternentstehung in kleinen Galaxien (solchen mit Virialgeschwindigkeiten von unter ∼ 80km/s). Hier führt sie zu einer staken Unterdrückung der Sternenbildung, in zunehmendem Maße für kleinere Galaxien mit einer geringeren Gesamtmasse. Durch diese Unterdrückung wird bei statistischer Betrachtung auch die Steigung der Leuchtkrafts-Verteilungfunktion von Galaxien an ihrem leuchtschwachen Ende stark beeinflußt; letztere wird deutlich flacher und bringt Simulationsergebnisse somit merklich näher an beobachtete Werte.