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1000 results for “fluiddyn”
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This is a torsional Alfvén wave, a wave that has been identified inside the Earth's fluid core.
With a period of about 6 years, it is powerful enough to magnetically grab the mantle and *slightly* slow down and speed up the Earth's rotation.
The animation shows the flow velocity, red towards the viewer, blue away from it. On the left is the solid inner core.
#science #Earth #fluiddynamics #whataboutmagneticfields #planetaryscience #physics
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To fly stably, parachutes need to deform and allow some air to pass through their canopy. In this video, researchers investigate kirigimi parachutes, inspired by a form of paper art that uses cuts to create three-dimensional shapes. After laser-cutting, these disks are dropped — or placed in a wind tunnel — to observe how they “fly” at different speeds. Sometimes they flutter or bend; other shapes elongate in the flow. (Video and image credit: D. Lamoureux et al.; via GoSM)
https://fyfluiddynamics.com/2024/05/kirigami-parachutes/
#2024gosm #drag #fluidDynamics #parachutes #physics #science #solidMechanics
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If you sandwich a viscous fluid between two plates and inject a less viscous fluid, you’ll get viscous fingers that spread and split as they grow. This research poster depicts that situation with a slight twist: the viscous fluid (transparent in the image) is shear-thinning. That means its viscosity drops when it’s deformed. In this situation, the fingers formed by the injected (blue) fluid start out the way we’d expect: splitting as they grow (inner portion of the composite image). But then, the tip-splitting stops and the fingers instead elongate into spikes (middle ring). Eventually, as the outer fluid’s viscosity drops further, the fingers round out and spread without splitting (outer arc of the image). (Image credit: E. Dakov et al.; via GoSM)
https://fyfluiddynamics.com/2024/04/evolving-fingers/
#2024gosmp #flowVisualization #fluidDynamics #HeleShawCell #instability #nonNewtonianFluids #physics #SaffmanTaylorInstability #science #shearThinning #surfaceTension #viscosity #viscousFingering
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If you sandwich a viscous fluid between two plates and inject a less viscous fluid, you’ll get viscous fingers that spread and split as they grow. This research poster depicts that situation with a slight twist: the viscous fluid (transparent in the image) is shear-thinning. That means its viscosity drops when it’s deformed. In this situation, the fingers formed by the injected (blue) fluid start out the way we’d expect: splitting as they grow (inner portion of the composite image). But then, the tip-splitting stops and the fingers instead elongate into spikes (middle ring). Eventually, as the outer fluid’s viscosity drops further, the fingers round out and spread without splitting (outer arc of the image). (Image credit: E. Dakov et al.; via GoSM)
https://fyfluiddynamics.com/2024/04/evolving-fingers/
#2024gosmp #flowVisualization #fluidDynamics #HeleShawCell #instability #nonNewtonianFluids #physics #SaffmanTaylorInstability #science #shearThinning #surfaceTension #viscosity #viscousFingering
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If you sandwich a viscous fluid between two plates and inject a less viscous fluid, you’ll get viscous fingers that spread and split as they grow. This research poster depicts that situation with a slight twist: the viscous fluid (transparent in the image) is shear-thinning. That means its viscosity drops when it’s deformed. In this situation, the fingers formed by the injected (blue) fluid start out the way we’d expect: splitting as they grow (inner portion of the composite image). But then, the tip-splitting stops and the fingers instead elongate into spikes (middle ring). Eventually, as the outer fluid’s viscosity drops further, the fingers round out and spread without splitting (outer arc of the image). (Image credit: E. Dakov et al.; via GoSM)
https://fyfluiddynamics.com/2024/04/evolving-fingers/
#2024gosmp #flowVisualization #fluidDynamics #HeleShawCell #instability #nonNewtonianFluids #physics #SaffmanTaylorInstability #science #shearThinning #surfaceTension #viscosity #viscousFingering
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If you sandwich a viscous fluid between two plates and inject a less viscous fluid, you’ll get viscous fingers that spread and split as they grow. This research poster depicts that situation with a slight twist: the viscous fluid (transparent in the image) is shear-thinning. That means its viscosity drops when it’s deformed. In this situation, the fingers formed by the injected (blue) fluid start out the way we’d expect: splitting as they grow (inner portion of the composite image). But then, the tip-splitting stops and the fingers instead elongate into spikes (middle ring). Eventually, as the outer fluid’s viscosity drops further, the fingers round out and spread without splitting (outer arc of the image). (Image credit: E. Dakov et al.; via GoSM)
https://fyfluiddynamics.com/2024/04/evolving-fingers/
#2024gosmp #flowVisualization #fluidDynamics #HeleShawCell #instability #nonNewtonianFluids #physics #SaffmanTaylorInstability #science #shearThinning #surfaceTension #viscosity #viscousFingering
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Mathematicians finally solved Feynman’s “reverse sprinkler” problem - Light-scattering microparticles reveal the flow pattern for the reve... - https://arstechnica.com/?p=2000600 #mathematicalmodeling #mathematicalphysics #reversesprinkler #richardfeynman #fluiddynamics #science #physics
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This week's work in two gifs 🎥🍿.
You can see a thin layer of liquid (color code) on a substrate. By changing the initial conditions a little, e.g. making the fluid ring thinner, we get very different outcomes 💧💦.More to come the following weeks hopefully 🙂
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...and after #peerreview 🧐 the final version is now published @J_Exp_Biol 🥳 Bravo Vincent! https://doi.org/10.1242/jeb.245929 In the video: Q-criterion isosurfaces colored by the streamwise vorticity computed from volumetric velocimetry #PIV #fluiddynamics
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Abelpreis 2023: Mit Mathematik die Welt besser verstehen#Abelpreis #Navier-Stokes #Millennium-Probleme #Differenzialgleichung #Analysis #Hydrodynamik #Fluiddynamik #Wasser #Mathematik
Abelpreis 2023: Mit Mathematik die Welt besser verstehen -
Was haben Golfbälle und Haie gemeinsam?
Warum haben Golfbällen diese ganzen Dellen und sind nicht einfach eine glatte Kugel?
Das Stichwort lautet für #Golfball und #Hai: #Fluiddynamik
Ich erklär euch, let's go!
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Very pretty splashes in 3D.
"Beautiful as a splash is, why only enjoy it from a single angle? In this video, the artists behind Macro Room offer a 360-degree perspective on various splashes and fluid collisions. I especially enjoy watching the splash crowns falling back over and out of the various containers they use. What’s your favorite part? (Image and video credit: Macro Room)"
#Physics #FluidDynamics #Videos #Visualisations
https://fyfluiddynamics.com/post/184690739382/beautiful-as-a-splash-is-why-only-enjoy-it-from-a
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Die schillernden Kugeln faszinieren auch wegen ihrer Kurzlebigkeit. Doch mit Glyzerin und winzigen Plastikteilchen in der wässrigen Hülle halten Seifenblasen hunderte Tage durch!
Schlichting!: Wie man Seifenblasen am Platzen hindert
#Seifenblasen #Interferenz #Optik #Fluiddynamik #Flüssigkeiten #sdw-202303 #Physik -
On the flight dynamics of paper planes.
"The proverbial "sweet spot" was placing the weight between those extremes [centre and edge]. In that case, the aerodynamic force on the plane's wing will push the wing back down if it moves upward, and push the wing back up if it moves downward. In other words, the center of pressure will vary with the angle of flight, thereby ensuring stability."
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Die schillernden Kugeln faszinieren auch wegen ihrer Kurzlebigkeit. Doch mit Glyzerin und winzigen Plastikteilchen in der wässrigen Hülle halten Seifenblasen hunderte Tage durch!
Schlichting!: Wie man Seifenblasen am Platzen hindert
#Seifenblasen #Interferenz #Optik #Fluiddynamik #Flüssigkeiten #sdw-202303 #Physik -
Die schillernden Kugeln faszinieren auch wegen ihrer Kurzlebigkeit. Doch mit Glyzerin und winzigen Plastikteilchen in der wässrigen Hülle halten Seifenblasen hunderte Tage durch!
Schlichting!: Wie man Seifenblasen am Platzen hindert
#Seifenblasen #Interferenz #Optik #Fluiddynamik #Flüssigkeiten #sdw-202303 #Physik -
Die schillernden Kugeln faszinieren auch wegen ihrer Kurzlebigkeit. Doch mit Glyzerin und winzigen Plastikteilchen in der wässrigen Hülle halten Seifenblasen hunderte Tage durch!
Schlichting!: Wie man Seifenblasen am Platzen hindert
#Seifenblasen #Interferenz #Optik #Fluiddynamik #Flüssigkeiten #sdw-202303 #Physik -
Physicists unlock secret of why champagne bubbles form straight chain as they rise - Enlarge / Researchers investigated the stability of bubble chains in ca... - https://arstechnica.com/?p=1934996 #carbonatedbeverages #fluidmechanics #fluiddynamics #foodanddrink #science #bubbles #physics
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Aflutter in the Breeze
Fabrics flutter in seemingly impossible ways in artist Thomas Jackson‘s images. But despite first appearances, each photograph is true to life; the fabrics are suspended on taut lines. Their dance is driven by wind energy, drag, tension, and flow–not manipulated pixels. I love the (turbulent) energy of them! (Image credit: T. Jackson; via Colossal)
#flapping #fluidDynamics #fluidSolidInteraction #fluidsAsArt #flutter #instability #physics #science #turbulence -
Quick-Drying, Fast-Cracking
Water droplets filled with nanoparticles leave behind deposits as they evaporate. Like a coffee ring, particles in the evaporating droplet tend to gather at the drop’s edge (left). As the water evaporates, the deposit grows inward (center) and cracks start to form radially. After just a couple minutes, the solid deposit covers the entire area of the original droplet and is shot through with cracks (right).
Researchers found that the cracks’ patterns and propagation are predictable through a model that balances the local elastic energy and and the energy cost of fracture. They also found that the spacing between radial cracks depends on the deposit’s local thickness. Besides explaining the patterns seen here, these cracking models could help analyze old paintings, where cracks could hide information about the artist’s methods and the artwork’s condition. (Image and research credit: P. Lilit et al.; via Physics Today)
#art #cracking #deposition #droplets #drying #evaporation #fluidDynamics #particleSuspension #physics #science
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The Best of FYFD 2024
Welcome to another year and another look back at FYFD’s most popular posts. (You can find previous editions, too, for 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, and 2014. Whew, that’s a lot!) Here are some of 2024’s most popular topics:
- The Taum Sauk Dam Failure and Its Legacy
- Stretching Ant Rafts
- Gigapixel Supernova
- Feynman’s Sprinkler Solved
- Calming the Waves
- “Dew Point” Deposits Droplets
- Drying Unaffected by Humidity
- Trapped in a Taylor Column
- Exciting a Flame in a Trough
- Remembering Rivers Past
- A Comet’s Tail
- Light Pillars
- Liquid Metal Printing
- The Miscible Faraday Instability
- A Triangular Prominence
This year’s topics are a good mix: fundamental research, civil engineering applications, geophysics, astrophysics, art, and one good old-fashioned brain teaser. Interested in what 2025 will hold? There are lots of ways to follow along so that you don’t miss a post.
And if you enjoy FYFD, please remember that it’s a reader-supported website. I don’t run ads, and it’s been years since my last sponsored post. You can help support the site by becoming a patron, buying some merch, or simply by sharing on social media. And if you find yourself struggling to remember to check the website, remember you can get FYFD in your inbox every two weeks with our newsletter. Happy New Year!
(Image credits: dam – Practical Engineering, ants – C. Chen et al., supernova – NOIRLab, sprinkler – K. Wang et al., wave tank – L-P. Euvé et al., “Dew Point” – L. Clark, paint – M. Huisman et al., iceberg – D. Fox, flame trough – S. Mould, sign – B. Willen, comet – S. Li, light pillars – N. Liao, chair – MIT News, Faraday instability – G. Louis et al., prominence – A. Vanoni)
#admin #ants #astrophysics #civilEngineering #comet #damFailure #drying #flowVisualization #fluidDynamics #fluidsAsArt #FYFD #instability #physics #plasma #rivers #rotatingFlow #science #selfExcitedOscillation #TaylorColumn #waveInterference
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“There is a crack in everything…”
When millimeter-sized drops of water infused with nanoparticles dry, they leave behind complex and beautiful residues. As water continues evaporating, the residues warp, bend, and crack. In this video, researchers set their science to the music of Leonard Cohen. The results resemble blooming flowers and flying water fowl. If you’d like to learn more about the science behind the art, check out the two open-access papers linked below. (Video and image credit: P. Lilin and I. Bischofberger; submitted by Irmgard B.; see also P. Lilin and I. Bischofberger and P. Lilin et al.)
#coffeeRings #cracking #droplets #drying #evaporation #fluidDynamics #fluidsAsArt #granularMaterial #particleSuspension #physics #science
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Drops on the Edge
Drops impacting a dry hydrophilic surface flatten into a film. Drops that impact a wet film throw up a crown-shaped splash. But what happens when a drop hits the edge of a wet surface? That’s the situation explored in this video, where blue-dyed drops interact with a red-dyed film. From every angle, the impact is complex — sending up partial crown splashes, generating capillary waves that shift the contact line, and chaotically mixing the drop and film’s liquids. (Video and image credit: A. Sauret et al.)
#2024gofm #crownSplash #dropletImpact #droplets #flowVisualization #fluidDynamics #fluidsAsArt #physics #science #wetting
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Inside a Big Cat’s Roar
The roars of big cats — tigers, lions, jaguars, and leopards — carry long distances. In part, this reflects the animals’ size: large lungs exhale lots of air through a large voice-box, whose vibrations resonate in a large throat. But size alone does not make the roar. Below are examples of two big cat voice-boxes. On the left is the nonroaring snow leopard; on the right is the voice-box of a roaring jaguar. The red boxes labeled “VF” mark each cat’s vocal folds. Nonroaring cats have triangular folds, while roaring ones have thick square or rectangular vocal folds. These rectangular folds are more aerodynamically efficient, allowing them to produce a wider range of output levels. They’re also more resilient to the intense forces of a roar, thanks to the cushioning effect of fat deposits inside them. If interested, you can learn more over at Physics Today. (Image credit: tiger – T. Myburgh, voice box – E. Walsh and J. McGee; research credit: E. Walsh and J. McGee)
The vocal folds (VF) of nonroaring cats are triangular (left), whereas roaring cats have rectangular vocal folds (right).#acoustics #biology #cats #fluidDynamics #physics #roaring #science
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Inside a Big Cat’s Roar
The roars of big cats — tigers, lions, jaguars, and leopards — carry long distances. In part, this reflects the animals’ size: large lungs exhale lots of air through a large voice-box, whose vibrations resonate in a large throat. But size alone does not make the roar. Below are examples of two big cat voice-boxes. On the left is the nonroaring snow leopard; on the right is the voice-box of a roaring jaguar. The red boxes labeled “VF” mark each cat’s vocal folds. Nonroaring cats have triangular folds, while roaring ones have thick square or rectangular vocal folds. These rectangular folds are more aerodynamically efficient, allowing them to produce a wider range of output levels. They’re also more resilient to the intense forces of a roar, thanks to the cushioning effect of fat deposits inside them. If interested, you can learn more over at Physics Today. (Image credit: tiger – T. Myburgh, voice box – E. Walsh and J. McGee; research credit: E. Walsh and J. McGee)
The vocal folds (VF) of nonroaring cats are triangular (left), whereas roaring cats have rectangular vocal folds (right).#acoustics #biology #cats #fluidDynamics #physics #roaring #science
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Inside a Big Cat’s Roar
The roars of big cats — tigers, lions, jaguars, and leopards — carry long distances. In part, this reflects the animals’ size: large lungs exhale lots of air through a large voice-box, whose vibrations resonate in a large throat. But size alone does not make the roar. Below are examples of two big cat voice-boxes. On the left is the nonroaring snow leopard; on the right is the voice-box of a roaring jaguar. The red boxes labeled “VF” mark each cat’s vocal folds. Nonroaring cats have triangular folds, while roaring ones have thick square or rectangular vocal folds. These rectangular folds are more aerodynamically efficient, allowing them to produce a wider range of output levels. They’re also more resilient to the intense forces of a roar, thanks to the cushioning effect of fat deposits inside them. If interested, you can learn more over at Physics Today. (Image credit: tiger – T. Myburgh, voice box – E. Walsh and J. McGee; research credit: E. Walsh and J. McGee)
The vocal folds (VF) of nonroaring cats are triangular (left), whereas roaring cats have rectangular vocal folds (right).#acoustics #biology #cats #fluidDynamics #physics #roaring #science
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Inside a Big Cat’s Roar
The roars of big cats — tigers, lions, jaguars, and leopards — carry long distances. In part, this reflects the animals’ size: large lungs exhale lots of air through a large voice-box, whose vibrations resonate in a large throat. But size alone does not make the roar. Below are examples of two big cat voice-boxes. On the left is the nonroaring snow leopard; on the right is the voice-box of a roaring jaguar. The red boxes labeled “VF” mark each cat’s vocal folds. Nonroaring cats have triangular folds, while roaring ones have thick square or rectangular vocal folds. These rectangular folds are more aerodynamically efficient, allowing them to produce a wider range of output levels. They’re also more resilient to the intense forces of a roar, thanks to the cushioning effect of fat deposits inside them. If interested, you can learn more over at Physics Today. (Image credit: tiger – T. Myburgh, voice box – E. Walsh and J. McGee; research credit: E. Walsh and J. McGee)
The vocal folds (VF) of nonroaring cats are triangular (left), whereas roaring cats have rectangular vocal folds (right).#acoustics #biology #cats #fluidDynamics #physics #roaring #science
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Inside a Big Cat’s Roar
The roars of big cats — tigers, lions, jaguars, and leopards — carry long distances. In part, this reflects the animals’ size: large lungs exhale lots of air through a large voice-box, whose vibrations resonate in a large throat. But size alone does not make the roar. Below are examples of two big cat voice-boxes. On the left is the nonroaring snow leopard; on the right is the voice-box of a roaring jaguar. The red boxes labeled “VF” mark each cat’s vocal folds. Nonroaring cats have triangular folds, while roaring ones have thick square or rectangular vocal folds. These rectangular folds are more aerodynamically efficient, allowing them to produce a wider range of output levels. They’re also more resilient to the intense forces of a roar, thanks to the cushioning effect of fat deposits inside them. If interested, you can learn more over at Physics Today. (Image credit: tiger – T. Myburgh, voice box – E. Walsh and J. McGee; research credit: E. Walsh and J. McGee)
The vocal folds (VF) of nonroaring cats are triangular (left), whereas roaring cats have rectangular vocal folds (right).#acoustics #biology #cats #fluidDynamics #physics #roaring #science
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How do vapor bubbles behave when water is below boiling?
Laser-induced bubbles offer a controlled way to probe nucleation and collapse dynamics far from equilibrium.
#phasechange #bubbledynamics #heattransfer #FluidPhysics #fluiddynamics