#hydrodynamics — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #hydrodynamics, aggregated by home.social.
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Fluid Flows Break Up Microswimmer Clumps
The field of active matter looks at the collective motion of particles and organisms–how birds flock and fish school. In systems of “dry” squirmers–those that have no hydrodynamic interactions with one another–clumps of squirmers can form with empty spaces in between them. This is known as motility-induced phase separation, or MIPS. Researchers wondered whether microswimmers in a fluid–which do produce hydrodynamic forces that can affect one another–would also show MIPS.
In a new study, researchers show, instead, that hydrodynamic interactions between swimmers will prevent (or destroy) these clumps. Through a combination of theoretical work and simulation, the authors found that translational flows between swimmers swept the swimmers out of clumps as they formed. Rotational flows between swimmers made them able to change direction faster, which also kept stable clumps from forming. (Image and research credit: T. Zhou and J. Brady; via APS)
Hydrodynamic interactions destroy clumps of microswimmers. This simulation shows microswimmers that are initially in a clumped formation before hydrodynamic interactions are “turned on”. Once the swimmers can affect one another through the flows their motion creates, the clumps quickly break apart. #activeMatter #biology #collectiveMotion #fluidDynamics #hydrodynamics #microswimmers #phaseSeparation #physics #science -
How do fluids really slip on surfaces?
This study proposes a method to estimate slip length and reconstruct flow fields from limited data.
A key step to better understand flows where friction at the wall nearly vanishes.
#fluiddynamics #interfacialflows #SlipLength #hydrodynamics #physics
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🌊 Open-source software advances design of offshore structures by testing wave-structure interactions
https://techxplore.com/news/2025-10-source-software-advances-offshore-interactions.html
#software #cornell #research #opensource #oceans #waves #hydrodynamics #simulation #engineering
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Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
https://wwwmpa.mpa-garching.mpg.de/~volker/arepo/
#HackerNews #GalilieanInvariant #CosmologicalSimulations #MovingMesh #Hydrodynamics #Astrophysics
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Kolk (vortex) (Oceanography 🌊)
A kolk is an underwater vortex causing hydrodynamic scour by rapidly rushing water past an underwater obstacle. High-velocity gradients produce a high-shear rotating column of water, similar to a tornado. Kolks can pluck multiple-ton blocks of rock and transport them in suspension for kilometres. Kolks leave clear evidence in the form of kolk lakes, a kind...
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Mesmerising wave patterns blown by the Bora (a strong wind blowing from the mountains down to the sea) on the coast in front of Miramare near #Trieste. So cool! #science #physics #hydrodynamics
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@logicable The question is so ill defined that the answer is obviously 'yes'. :-)
Rivers aren't straight and so flow in a continuum of differing directions simultaneously.
Even a totally straight river/canal can be flowing normally out to sea when a sudden high tide or wave causes one end of it to flow briefly 'the wrong way'.
What is the question intended to mean?
#maths #rivers #hydrodynamics #logic
(Here's a picture of the Thames flowing both North and South - as is normal.) -
Vortex Trapping Of Suspended Sand Grains Over Ripples
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https://doi.org/10.1029/2023JF007620 <-- shared paper
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“KEY POINTS
• Observations of vortex-trapped grains suggest delayed settling of advected grains, as well as delayed advection of grains mobilized from the bed
• Quantitative comparisons of vortex-trapped sand grains compared well with theoretical formulations by Nielsen (1992, https://doi.org/10.1142/1269) for a forced vortex
• Improved understanding of vortex trapping effects on sediment dynamics may decrease uncertainty in large-scale coastal model predictions..."
#spatial #model #modeling #water #hydrology #hydrodynamics #vortex #sand #sediment #transport #sedimentation #sedimentology #morphodynamics #fluiddynamics #ripples #coast #coastal #research #velocimetry #suspension #experimentation #dynamics #geology #processes #geomorphology #geomorphometry #vortextrapping #sand #grains #flow #ripple #sandwaves #ripples -
Studying the skin of the great white shark could help reduce drag in aircraft - Enlarge / Great white sharks can reduce drag at different swimming spee... - https://arstechnica.com/?p=2042552 #greatwhiteshark #fluiddynamics #hydrodynamics #biomimicry #science #biology #physics #sharks
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Pass the mayo: Condiment could help improve fusion energy yields - Enlarge (credit: jules/CC BY 2.0)
Inertial confinement fusion ... - https://arstechnica.com/?p=2042179 #rayleigh-taylorinstability #phasetransitions #nuclearphysics #fluiddynamics #hydrodynamics #nuclearfusion #condiments #science #physics
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Thomsen River Estuary, Banks Island [NASA Earth Observatory Daily Image]
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https://earthobservatory.nasa.gov/images/147560/thomsen-river-estuary-banks-island <-- link to NASA Earth Observatory image
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[photos in the main from 2015]
#GIS #spatial #mapping #remotesensing #OLI #hydrology #water #sediment #arctic #ocean #climatechange #ArcticOcean #landsat #landsat8 #BanksIsland #Aulavik #ice #snow #permafrost #tundra #Canada #ThomsenRiver #estuary #sedimentation #erosion #braiding #braided #hydrodynamics #geochemistry #geology #acidification
@nasa -
Lake Wānaka Mapped In Exquisite Detail [topobathy, New Zealand]
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https://niwa.co.nz/news/lake-wanaka-mapped-exquisite-detail <-- shared technical article
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#GIS #spatial #mapping #hydrospatial #bathymetry #remotesensing #LakeWanaka #Wanaka #NewZealand #topobathy #lake #floor #water #hydrology #survey #underwater #geology #geomorphometry #earthquake #fault #faulting #NIWA #lakebed #glacial #glacier #multibeam #echosounder #3dmodel #waterquality #landuse #freshwater #nutrients #sediment #sedimentation #climatechange #model #modeling #catchments #hydrodynamics
@niwa_nz -
The Roller Ship Was Not An Effective Way To Cross The High Seas https://hackaday.com/2024/03/27/the-roller-ship-was-not-an-effective-way-to-cross-the-high-seas/ #HackadayColumns #hydrodynamics #rollership #MiscHacks #boat #drag #ship
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The Roller Ship Was Not An Effective Way To Cross The High Seas - Boats come in all shapes and sizes. We have container ships, oil tankers, old-time... - https://hackaday.com/2024/03/27/the-roller-ship-was-not-an-effective-way-to-cross-the-high-seas/ #hackadaycolumns #hydrodynamics #rollership #mischacks #boat #drag #ship
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After admitting defeat, we send it to Phys Rev Fluids and I'm super happy that Prof. Howard Stone accepted it right away without sending it to further reviewers.
In the paper we discuss the dewetting instability of a thin liquid film on a switchable substrate. We actually found a cool metastable rivulet state.
Here is the link to the publication: https://journals.aps.org/prfluids/abstract/10.1103/PhysRevFluids.8.L122001
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Good news for clumsy divers: Physics holds the key to less-painful belly flops - Brown researchers set up a belly flop-like water experiment using a ... - https://arstechnica.com/?p=1981301 #air/waterinterface #harmonicoscillator #marineengineering #fluidmechanics #surfacetension #hydrodynamics #bellyflops #science #physics #diving
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How do kingfishers avoid concussions when diving? It might be in their genes - Enlarge / Fish-eating kingfishers execute plunging dives into the water... - https://arstechnica.com/?p=1977728 #convergentevolution #behavioralgenetics #animalbehavior #hydrodynamics #fieldmuseum #kingfishers #evolution #genetics #science #animals #biology #physics #birds
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The physics of how gentoo penguins can swim speedily underwater - Enlarge / Gentoo penguins are the world's fastest swimming birds, thank... - https://arstechnica.com/?p=1948717 #fluidmechanics #fluiddynamics #hydrodynamics #biomechanics #penguins #science #animals #biology #physics
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In 1738, Daniel Bernoulli discovered the principle that increasing the flow of a gas or liquid decreases its pressure. #Poetry #Science #History #Hydrodynamics #Bernoulli (https://sharpgiving.com/thebookofscience/items/p1738.html)
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📢The dept. of Coastal Systems on #Texel is #hiring a postdoc with a background in #oceanography, #biogeochemistry and/or #hydrodynamics and modelling for research on offshore solar farms.
👉More info and apply via: https://workingat.nioz.nl/o/postdoc-modelling-the-ecosystem-effects-of-floating-offshore-solar-farms
#searesearch for #climate and #biodiversity -
Chun Shen (Wayne State Uni) got the young scientist award 2022 #hydrodynamics #QuarkGluonPlasma
Volodymyr Vovchenko (Uni of Houston) got the early career scientist prize in #NuclearPhysics
Congratulations!!! 🎆 🎆 🎆
Prices by the International Union of Pure and Applied #physics #science
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What is the scientific word for a Fluid or semi-Fluid that holds its bead when put on a surface. Think ketchup. You could write with it, and the ketchup would mostly hold its location and height.
Is this viscosity also? Or is there a word for the vertical strength of a liquid/gel
#hydrodynamics #science #engineering #liquid #gel #viscous #viscosity
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The secret to the skillful skydiving of wingless springtails https://phys.org/news/2022-11-secret-skillful-skydiving-wingless-springtails.html Paper: https://www.pnas.org/doi/10.1073/pnas.2211283119
"These extraordinary organisms with unique morphology live at a very precarious place: the water surface. So, when they jump from and land back on water, we must understand the effects of both #hydrodynamics and #aerodynamics. How they land perfectly on their feet almost every time on the surface of water was the puzzle we set to solve."
