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1000 results for “fluiddyn”
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Slipping Ice Streams
The Northeast Greenland Ice Stream provides about 12% of the island’s annual ice discharge, and so far, models cannot accurately capture just how quickly the ice moves. Researchers deployed a fiber-optic cable into a borehole and set explosive charges on the ice to capture images of its interior through seismology. But in the process, they measured seismic events that didn’t correspond to the team’s charges.
Instead, the researchers identified the signals as small, cascading icequakes that were undetectable from the surface. The quakes were signs of ice locally sticking and slipping — a failure mode that current models don’t capture. Moreover, the team was able to isolate each event to distinct layers of the ice, all of which corresponded to ice strata affected by volcanic ash (note the dark streak in the ice core image above). Whenever a volcanic eruption spread ash on the ice, it created a weaker layer. Even after hundreds more meters of ice have formed atop these weaker layers, the ice still breaks first in those layers, which may account for the ice stream’s higher-than-predicted flow. (Image credit: L. Warzecha/LWimages; research credit: A. Fichtner et al.; via Eos)
#fluidDynamics #geology #geophysics #glacier #glaciology #ice #iceFormation #physics #science #seismicWaves #seismology
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The early light of dawn illuminates ice forming at the edge of this pond in Vermont. Caught after a frigid mid-November night, the ice is some of winter’s first. The interface between seasons reflects the interface in water phases. (Image credit: A. Raeder; via CUPOTY)
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The early light of dawn illuminates ice forming at the edge of this pond in Vermont. Caught after a frigid mid-November night, the ice is some of winter’s first. The interface between seasons reflects the interface in water phases. (Image credit: A. Raeder; via CUPOTY)
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Martian Mud Volcanoes
Mars features mounds that resemble our terrestrial mud volcanoes, suggesting that a similar form of mudflow occurs on Mars. But Mars’ thin atmosphere and frigid temperatures mean that water — a prime ingredient of any mud — is almost always in either solid or gaseous form on the planet. So researchers explored whether salty muds could flow under Martian conditions. They tested a variety of salts, at different concentrations, in a low-pressure chamber calibrated to Mars-like temperatures and pressures. The salts lowered water’s freezing point, allowing the muds to remain fluid. Even a relatively small amount of sodium chloride — 2.5% by weight — allowed muds to flow far. The team also found that the salt content affected the shape the flowing mud took, with flows ranging from narrow, ropey patterns to broad, even sheets. (Image credit: P. Brož/Wikimedia Commons; research credit: O. Krýza et al.; via Eos)
#fluidDynamics #geophysics #Mars #mud #mudPots #mudVolcano #physics #planetaryScience #science #viscousFlow
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Reclaiming the Land
Lava floods human-made infrastructure on Iceland’s Reykjanes peninsula in this aerial image from photographer Ael Kermarec. Protecting roads and buildings from lava flows is a formidable challenge, but it’s one that researchers are tackling. But the larger and faster the lava flow, the harder infrastructure is to protect. Sometimes our best efforts are simply overwhelmed by nature’s power. (Image credit: A. Kermarec/WNPA; via Colossal)
#fluidDynamics #fluidsAsArt #geophysics #gravityCurrent #lava #physics #science #viscousFlow
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A Magnetic Tsunami Warning
Tsunamis are devastating natural disasters that can strike with little to no warning for coastlines. Often the first sign of major tsunami is a drop in the sea level as water flows out to join the incoming wave. But researchers have now shown that magnetic fields can signal a coming wave, too. Because seawater is electrically conductive, its movement affects local magnetic fields, and a tsunami’s signal is large enough to be discernible. One study found that the magnetic field level changes are detectable a full minute before visible changes in the sea level. One minute may not sound like much, but in an evacuation where seconds count, it could make a big difference in saving lives. (Image credit: Jiji Press/AFP/Getty Images; research credit: Z. Lin et al.; via Gizmodo)
#fluidDynamics #geophysics #magneticField #magnetohydrodynamics #physics #science #tsunami
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Reinterpreting Uranus’s Magnetosphere
NASA launched the Voyager 2 probe nearly 50 years ago, and, to date, it’s the only spacecraft to visit icy Uranus. This ice giant is one of our oddest planets — its axis is tilted so that it rotates on its side! — but a new interpretation of Voyager 2’s data suggests it’s not quite as strange as we’ve thought. Initially, Voyager 2’s data on Uranus’s magnetosphere suggested it was a very extreme place. Unlike other planets, it had energetic energy belts but no plasma. Now researchers have explained Voyager 2’s observations differently: they think the spacecraft arrived just after an intense solar wind event compressed Uranus’s magnetosphere, warping it to an extreme state. Their estimates suggest that Uranus would experience this magnetosphere state less than 5% of the time. But since Voyager 2’s data point is, so far, our only look at the planet, we just assumed this extreme was normal. (Image credit: NASA; research credit: J. Jasinski et al.; via Gizmodo)
#fluidDynamics #magnetohydrodynamics #physics #science #solarWind #Uranus
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“One”
A 4-minute, unedited one-shot video of colorful paint sliding down a sheet? Yes, please.
Beautiful visuals aside, there are some really interesting physics involved here. It’s unclear whether the there’s any change in the speed at which paint gets deposited at the top of the incline over the course of the video, yet we see huge changes in the visual patterns. This happens, in part, because the layer of paint is getting thicker and heavier over time, changing the dynamics of its slide under gravity. There may even be some shear-thinning going on, given that paint is usually non-Newtonian. I can imagine some connections to landslides, avalanches, and other gravity currents with non-Newtonian fluids. (Video and image credit: R. De Giuli)
#fluidDynamics #fluidsAsArt #gravityCurrent #nonNewtonianFluids #physics #science #shearThinning
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I made a circular von Kármán vortex street!
[1/4] 🧵
#eddies #flowVisualization #fluidDynamics #fluidsAsArt #physics #science #diynamics -
You can catch all the past #ThisMonthInFluiddyn posts either here in fedi or via our blog:
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Searching for the Seiche
On 16 September 2023, seismometers around the world began ringing, registering a signal that — for 9 days — wobbled back and forth every 92 seconds. A second, similar signal appeared a month later, lasting about a week. Researchers tracked the signal’s origin to a remote fjord in East Greenland, where it appeared a glacier front had collapsed. The falling rocks and ice triggered a long-lasting wave — a seiche — that rang back and forth through the fjord for days.
Simulations showed that a seiche was plausible from a rockfall like the two that caused the seismic signal, but, without first-hand observations, no one could be certain. Now a new study has looked at satellite data to confirm the seiche. Researchers found that the then-new Surface Water and Ocean Topography (SWOT) satellite and its high-resolution altimeters had passed over the fjord multiple during the two landslide events. And, sure enough, the satellite captured data showing the water surface in the fjord rising and falling as the seiche ricocheted back and forth.
It’s a great reminder that having multiple instrument types monitoring the Earth gives us far better data than any singular one. Without both seismometers and the satellite, it’s unlikely that scientists could have truly confirmed a seiche that no one saw firsthand. (Image credit: S. Rysgaard; research credit: T. Monahan et al.; via Eos)
#fluidDynamics #geophysics #physics #planetaryScience #science #seiche
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Searching for the Seiche
On 16 September 2023, seismometers around the world began ringing, registering a signal that — for 9 days — wobbled back and forth every 92 seconds. A second, similar signal appeared a month later, lasting about a week. Researchers tracked the signal’s origin to a remote fjord in East Greenland, where it appeared a glacier front had collapsed. The falling rocks and ice triggered a long-lasting wave — a seiche — that rang back and forth through the fjord for days.
Simulations showed that a seiche was plausible from a rockfall like the two that caused the seismic signal, but, without first-hand observations, no one could be certain. Now a new study has looked at satellite data to confirm the seiche. Researchers found that the then-new Surface Water and Ocean Topography (SWOT) satellite and its high-resolution altimeters had passed over the fjord multiple during the two landslide events. And, sure enough, the satellite captured data showing the water surface in the fjord rising and falling as the seiche ricocheted back and forth.
It’s a great reminder that having multiple instrument types monitoring the Earth gives us far better data than any singular one. Without both seismometers and the satellite, it’s unlikely that scientists could have truly confirmed a seiche that no one saw firsthand. (Image credit: S. Rysgaard; research credit: T. Monahan et al.; via Eos)
#fluidDynamics #geophysics #physics #planetaryScience #science #seiche
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Searching for the Seiche
On 16 September 2023, seismometers around the world began ringing, registering a signal that — for 9 days — wobbled back and forth every 92 seconds. A second, similar signal appeared a month later, lasting about a week. Researchers tracked the signal’s origin to a remote fjord in East Greenland, where it appeared a glacier front had collapsed. The falling rocks and ice triggered a long-lasting wave — a seiche — that rang back and forth through the fjord for days.
Simulations showed that a seiche was plausible from a rockfall like the two that caused the seismic signal, but, without first-hand observations, no one could be certain. Now a new study has looked at satellite data to confirm the seiche. Researchers found that the then-new Surface Water and Ocean Topography (SWOT) satellite and its high-resolution altimeters had passed over the fjord multiple during the two landslide events. And, sure enough, the satellite captured data showing the water surface in the fjord rising and falling as the seiche ricocheted back and forth.
It’s a great reminder that having multiple instrument types monitoring the Earth gives us far better data than any singular one. Without both seismometers and the satellite, it’s unlikely that scientists could have truly confirmed a seiche that no one saw firsthand. (Image credit: S. Rysgaard; research credit: T. Monahan et al.; via Eos)
#fluidDynamics #geophysics #physics #planetaryScience #science #seiche
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“Alive Painting”
Artist Akiko Nakayama’s intuitive grasp of fluid dynamics is so good that she manipulates liquids live to musical accompaniment. Her dendritic paintings — made from a combination of acrylic paint and isopropyl alcohol — inspired scientific research papers. There’s no substitute, I’m sure, for seeing her art live, but you can get a taste of her performances in the video below. Then you can head over to Physics World for more on the artist, her inspirations, and her scientific collaborations. (Image credits: H. Akagi and A. Nakayama; video credit: Eternal Art Space; via Physics World)
https://www.youtube.com/watch?v=S598Y9-JjZs
#fluidDynamics #fluidsAsArt #instability #marangoniEffect #physics #science
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“Alive Painting”
Artist Akiko Nakayama’s intuitive grasp of fluid dynamics is so good that she manipulates liquids live to musical accompaniment. Her dendritic paintings — made from a combination of acrylic paint and isopropyl alcohol — inspired scientific research papers. There’s no substitute, I’m sure, for seeing her art live, but you can get a taste of her performances in the video below. Then you can head over to Physics World for more on the artist, her inspirations, and her scientific collaborations. (Image credits: H. Akagi and A. Nakayama; video credit: Eternal Art Space; via Physics World)
https://www.youtube.com/watch?v=S598Y9-JjZs
#fluidDynamics #fluidsAsArt #instability #marangoniEffect #physics #science
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“Alive Painting”
Artist Akiko Nakayama’s intuitive grasp of fluid dynamics is so good that she manipulates liquids live to musical accompaniment. Her dendritic paintings — made from a combination of acrylic paint and isopropyl alcohol — inspired scientific research papers. There’s no substitute, I’m sure, for seeing her art live, but you can get a taste of her performances in the video below. Then you can head over to Physics World for more on the artist, her inspirations, and her scientific collaborations. (Image credits: H. Akagi and A. Nakayama; video credit: Eternal Art Space; via Physics World)
https://www.youtube.com/watch?v=S598Y9-JjZs
#fluidDynamics #fluidsAsArt #instability #marangoniEffect #physics #science
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And this is basically how you can make experimental #fluiddynamics measurements such as #ParticleImageVelocimetry #PIV in fixed bed reactors used, e.g., as heterogenous catalytic reactors in the chemical industry.
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RT @TheSpaceGal
Using the refractive index to make pennies float 🪄Impt safety note: dry water beads grow 100x their size (to what you see here), so be extra vigilant with the dry beads before they’ve grown around kids…
https://twitter.com/TheSpaceGal/status/1630628058519719937 -
And this is basically how you can make experimental #fluiddynamics measurements such as #ParticleImageVelocimetry #PIV in fixed bed reactors used, e.g., as heterogenous catalytic reactors in the chemical industry.
---
RT @TheSpaceGal
Using the refractive index to make pennies float 🪄Impt safety note: dry water beads grow 100x their size (to what you see here), so be extra vigilant with the dry beads before they’ve grown around kids…
https://twitter.com/TheSpaceGal/status/1630628058519719937 -
Each year, the “Gallery of Fluid Motion” highlights the videos submitted to the Annual Meeting of the APS Division of Fluid Dynamics.
And each year there are some brilliant videos featuring physics that you could (with a bit of experimentation) see in a coffee cup.
This is one of this years winners - and while the authors don’t mention this explicitly - it’s what could happen if you put your #coffee cup on a #loudspeaker
#physics #beautifulscience #fluiddynamics
https://gfm.aps.org/meetings/dfd-2022/631fa12d199e4c2da9a94869
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Martian Mud Volcanoes
Mars features mounds that resemble our terrestrial mud volcanoes, suggesting that a similar form of mudflow occurs on Mars. But Mars’ thin atmosphere and frigid temperatures mean that water — a prime ingredient of any mud — is almost always in either solid or gaseous form on the planet. So researchers explored whether salty muds could flow under Martian conditions. They tested a variety of salts, at different concentrations, in a low-pressure chamber calibrated to Mars-like temperatures and pressures. The salts lowered water’s freezing point, allowing the muds to remain fluid. Even a relatively small amount of sodium chloride — 2.5% by weight — allowed muds to flow far. The team also found that the salt content affected the shape the flowing mud took, with flows ranging from narrow, ropey patterns to broad, even sheets. (Image credit: P. Brož/Wikimedia Commons; research credit: O. Krýza et al.; via Eos)
#fluidDynamics #geophysics #Mars #mud #mudPots #mudVolcano #physics #planetaryScience #science #viscousFlow
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Martian Mud Volcanoes
Mars features mounds that resemble our terrestrial mud volcanoes, suggesting that a similar form of mudflow occurs on Mars. But Mars’ thin atmosphere and frigid temperatures mean that water — a prime ingredient of any mud — is almost always in either solid or gaseous form on the planet. So researchers explored whether salty muds could flow under Martian conditions. They tested a variety of salts, at different concentrations, in a low-pressure chamber calibrated to Mars-like temperatures and pressures. The salts lowered water’s freezing point, allowing the muds to remain fluid. Even a relatively small amount of sodium chloride — 2.5% by weight — allowed muds to flow far. The team also found that the salt content affected the shape the flowing mud took, with flows ranging from narrow, ropey patterns to broad, even sheets. (Image credit: P. Brož/Wikimedia Commons; research credit: O. Krýza et al.; via Eos)
#fluidDynamics #geophysics #Mars #mud #mudPots #mudVolcano #physics #planetaryScience #science #viscousFlow
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Martian Mud Volcanoes
Mars features mounds that resemble our terrestrial mud volcanoes, suggesting that a similar form of mudflow occurs on Mars. But Mars’ thin atmosphere and frigid temperatures mean that water — a prime ingredient of any mud — is almost always in either solid or gaseous form on the planet. So researchers explored whether salty muds could flow under Martian conditions. They tested a variety of salts, at different concentrations, in a low-pressure chamber calibrated to Mars-like temperatures and pressures. The salts lowered water’s freezing point, allowing the muds to remain fluid. Even a relatively small amount of sodium chloride — 2.5% by weight — allowed muds to flow far. The team also found that the salt content affected the shape the flowing mud took, with flows ranging from narrow, ropey patterns to broad, even sheets. (Image credit: P. Brož/Wikimedia Commons; research credit: O. Krýza et al.; via Eos)
#fluidDynamics #geophysics #Mars #mud #mudPots #mudVolcano #physics #planetaryScience #science #viscousFlow
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#ThisMonthInFluiddyn it is. Let's go 😎
🔹@PierreAugier and friends are finishing up an article, so as a side project they released #formattex and #formatbibtex based on #TexSoup and #BibtexParser
https://pypi.org/project/formattex/
https://pypi.org/project/formatbibtex/> a simple and uncompromising #Latex code formatter
🔹Version 0.7.4 of #fluidsim and fluidsim-core were released containing a refactored energy spectra for #NavierStokes solvers and other bug fixes
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#ThisMonthInFluiddyn it is. Let's go 😎
🔹@PierreAugier and friends are finishing up an article, so as a side project they released #formattex and #formatbibtex based on #TexSoup and #BibtexParser
https://pypi.org/project/formattex/
https://pypi.org/project/formatbibtex/> a simple and uncompromising #Latex code formatter
🔹Version 0.7.4 of #fluidsim and fluidsim-core were released containing a refactored energy spectra for #NavierStokes solvers and other bug fixes
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#ThisMonthInFluiddyn it is. Let's go 😎
🔹@PierreAugier and friends are finishing up an article, so as a side project they released #formattex and #formatbibtex based on #TexSoup and #BibtexParser
https://pypi.org/project/formattex/
https://pypi.org/project/formatbibtex/> a simple and uncompromising #Latex code formatter
🔹Version 0.7.4 of #fluidsim and fluidsim-core were released containing a refactored energy spectra for #NavierStokes solvers and other bug fixes
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#ThisMonthInFluiddyn it is. Let's go 😎
🔹@PierreAugier and friends are finishing up an article, so as a side project they released #formattex and #formatbibtex based on #TexSoup and #BibtexParser
https://pypi.org/project/formattex/
https://pypi.org/project/formatbibtex/> a simple and uncompromising #Latex code formatter
🔹Version 0.7.4 of #fluidsim and fluidsim-core were released containing a refactored energy spectra for #NavierStokes solvers and other bug fixes
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#ThisMonthInFluiddyn - Jan 2024 edition
Plenty on the packaging front this time.
🔹Ported to #pdm as packaging tool for most of our projects.
🔹Trying out #pixi as an alternative to #conda / #mamba. Lock files are great, but we had some hiccups.
🔹#transonic has implemented an experimental support for #meson and #MesonPython. Unreleased and nothing final yet, but tests on #fluidsim and discussion at #Pythran is ongoing.
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#ThisMonthInFluiddyn - Jan 2024 edition
Plenty on the packaging front this time.
🔹Ported to #pdm as packaging tool for most of our projects.
🔹Trying out #pixi as an alternative to #conda / #mamba. Lock files are great, but we had some hiccups.
🔹#transonic has implemented an experimental support for #meson and #MesonPython. Unreleased and nothing final yet, but tests on #fluidsim and discussion at #Pythran is ongoing.
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#ThisMonthInFluiddyn - Jan 2024 edition
Plenty on the packaging front this time.
🔹Ported to #pdm as packaging tool for most of our projects.
🔹Trying out #pixi as an alternative to #conda / #mamba. Lock files are great, but we had some hiccups.
🔹#transonic has implemented an experimental support for #meson and #MesonPython. Unreleased and nothing final yet, but tests on #fluidsim and discussion at #Pythran is ongoing.
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#ThisMonthInFluiddyn - Jan 2024 edition
Plenty on the packaging front this time.
🔹Ported to #pdm as packaging tool for most of our projects.
🔹Trying out #pixi as an alternative to #conda / #mamba. Lock files are great, but we had some hiccups.
🔹#transonic has implemented an experimental support for #meson and #MesonPython. Unreleased and nothing final yet, but tests on #fluidsim and discussion at #Pythran is ongoing.