#turbulence — Public Fediverse posts

Diffusivity-Free Turbulence in Liquid Metal Rotating Rayleigh-Bénard Convection Experiments: https://journals.aps.org/prl/abstract/10.1103/pc8y-j7g8 -> A look inside stars and planets: https://www.hzdr.de/db/Cms?pNid=99&pOid=78457 - experiment confirms prediction about #turbulence in rapidly rotating celestial bodies.

The turbulent AI era is here. The choices we make now are critical

https://www.gatesnotes.com/home/home-page-topic/reader/a-turbulent-ai-era-and-critical-choices-to-make

Comments: https://news.ycombinator.com/item?id=49497803

#HackerNews #AI #Era #Choices #Turbulence #Technology #Future

The turbulent AI era is here

https://www.gatesnotes.com/work/make-ai-work-for-everyone/reader/a-turbulent-ai-era-and-critical-choices-to-make?WT.mc_id=20260826_ai-overture-2026-med-med

Comments: https://news.ycombinator.com/item?id=49447057

#HackerNews #AI #Era #Turbulence #TechTrends #FutureOfAI #CriticalChoices

Strong magnetic fields inhibit the formation of Rayleigh Taylor instabilities at the interface between #coffee and milk in the café bombon in #Santander #turbulence

💁🏻‍♀️ TIL: 🧠🐝 A University of #Colorado #Boulder team studied how #turbulence transforms odor signals as they travel.

Using #wind tunnels, #lasers, and real-world plume measurements, they identified three ways airflow filters, spreads, and generates odor frequencies. They argue these systematic changes encode distance and direction information #animals use for olfactory #navigation.

👉 https://phys.org/news/2026-08-decoding-reveals-odor.html

#science #smell #olfaction #bees #neuroscience #physics #cuboulder #research #biology

@Umbertogaetani Their simulations suggest that #water rising through narrow dykes would freeze too quickly to supply the volumes needed for features such as chaos terrain, pits, domes or ridges. #Turbulence makes this worse by enhancing heat loss, supercooling the water, producing frazil ice, and clogging the dyke.

If correct, shallow liquid reservoirs on #Europa may form more by local in situ melting than by direct #ocean-to-surface exchange.

#PlanetaryScience #SpacePhysics #IcyMoons

16. More #turbulence on the head of water jets in #Bilbao

15. More #turbulence in the final breakup region of a water jet (continuation of https://mastodon.social/@franco_vazza/117041895435535770)

Thanks to the world's most powerful solar telescope, scientists have captured the solar surface in unprecedented detail and captured photos and videos of solar plasma vortices. These images were obtained using the Inouye Telescope, the world's largest solar telescope, located atop a mountain in Hawaii. Ubiquitous magnetized Kelvin-Helmholtz instabilities at the edges of magnetic flux concentrations, long predicted theoretically, have been discovered.

https://www.nature.com/articles/s41586-026-10871-3

#astronomy #sun #turbulence #physics #solar_dynamics #solar_activity

Weekly Update from the Open Journal of Astrophysics 08/08/2026

Although it’s holiday season for some, it’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further four papers, bringing the number in Volume 9 (2026) to 167 and the total so far published by OJAp up to 615.

I continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.

The first paper to report this week was published on Tuesday 4th August in the folder Astrophysics of Galaxies with the title “Small-scale turbulence alongside large-scale turbulence in a z=1.87 star-forming galaxy with an outflowing wind, revealed by multi-point structure functions” by Itzhak Goldman (Afeka College, Israel). A previous study by the author found evidence of large and small scale turbulence in the star-forming galaxy CSWA13, suggesting that star clusters and large clumps within the galaxy could be driving this turbulence.

The overlay for this paper is here

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/117036181269903989

The second paper for this week, published on Thursday 6th August in the folder Astrophysics of Galaxies, is “From Clumps to Sheets: Geometry Controls the Temperature PDF of Multi-Phase Gas” by Zirui Chen and S. Peng Oh (UC Santa Barbara, USA). This study uses 3D hydrodynamic simulations to show that the temperature probability distribution functions (PDFs) of multi-phase turbulent gas differ significantly under interstellar medium (ISM) and circumgalactic medium (CGM) conditions.

The overlay looks like this:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/117047322340826393

The third paper of the week, published on Thursday 6th August in folder Instrumentation and Methods for Astrophysics is “First Detection of Extensive Air Showers Using a Small-Aperture Fluorescence Telescope” by M. Zotov (M.V. Lomonosov Moscow State University, Russia) and 7 others based in Russia and Armenia. The study reports the first-ever detection of extensive air showers from ultra-high-energy cosmic rays using a compact fluorescence telescope, employing both conventional and deep learning analysis methods.

The overlay is here:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/117047408583672745

The fourth and final paper of the week was published on Friday 7th August in the folder Cosmology and Nongalactic Astrophysics: “TDCOSMO XXVI: Uniform Lens Modeling of Eight Doubly Imaged Quasars“, by Ryan Brady (Stony Brook University, USA) and 9 others based all around the world, presents a new method for analyzing doubly imaged quasars using the Hubble Space Telescope, revealing that arc surface brightness is key to precision in mass model measurements.

The overlay is here:

The officially-accepted version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/117053056092162466

That’s all for this week. We have about a dozen more papers accepted and waiting for the authors to put the final version on arXiv, which they will presumably do when they’re back from holiday. I’ll do an update next weekend and we’ll see!

This is the exciting part: #KHI can mix magnetized and non-magnetized #plasma, drive #turbulence, transport mass/energy/momentum/ #MagneticFlux, and may contribute to small-scale #magnetic braiding, thus one route by which free #MagneticEnergy is built up in the solar #atmosphere.

That makes them relevant to the long-standing puzzle of why the #corona is heated to millions of kelvin while the visible surface is only ~5,800 K. 😎🔥

#SolarPhysics #PlasmaPhysics #SpacePhysics #KHI

Speaking of #turbulence (https://mastodon.social/@franco_vazza/117041895435535770) here is instead the simulated version of it, for the plasma conditions of the hot x-ray halo of the Milky Way (about one million degrees Kelvin)

This shows the possibile outcome of stationary driven turbulence in a small portion of it, using supersonic forcing in the ENZO code #astrophysics #physics #science

#Turbulence is probably the complex emergent phenomenon we can observe in a more iniquitous way, at all scales, epochs and in all environments. It is also continuously around us on Earth, although we don't often pay attention to it - and sometimes it is just a nuisance.

Here a short parade of turbulence I randomly recorded (or generated) around me in these latest years

1. Droplets of coffee in milk

#physics #science #fluids

🌪️ Turbulence: The Greatest Unsolved Problem in Classical Physics

Despite centuries of research, turbulence remains one of the deepest mysteries in physics. From the chaotic wake behind an aircraft to swirling hurricanes, ocean currents, combustion, blood flow, and even the birth of stars, turbulent motion is everywhere, yet predicting it precisely remains extraordinarily difficult.

This challenge has fascinated some of history's greatest scientific minds. Horace Lamb famously remarked that, upon reaching heaven, he hoped to finally understand quantum electrodynamics and turbulence, adding that he was "rather optimistic" about the former. Richard Feynman likewise described turbulence as one of the most important unsolved problems in classical physics. A quote often attributed to Werner Heisenberg expresses a similar sentiment, although its authenticity remains uncertain.

The difficulty lies in turbulence's nonlinear nature: tiny changes can produce dramatically different outcomes, with countless interacting vortices spanning an enormous range of scales. While the Navier–Stokes equations describe fluid motion, obtaining complete analytical solutions for turbulent flows remains one of the greatest challenges in physics, mathematics, and computational science.

Understanding turbulence isn't merely an academic pursuit, it has profound implications for aviation, climate modelling, renewable energy, engineering, astrophysics, medicine, and space exploration. Every advance brings us closer to more efficient aircraft, more accurate weather forecasts, cleaner energy systems, and deeper insights into the natural world.

Sometimes, the most familiar phenomena are also the most mysterious.

#Turbulence

And #FantasticVoyage lived up to expectations…

It looked fantastic. #Turbulence was mentioned very early on… 🥳 and the sets were so cool.

And there cant be many movies where a plot point is resolved by a dude whipping out a slide-rule?

The only downer was that it was an afternoon movie and the weather was the nicest we’ve had in weeks. 😐

https://youtu.be/dO5E4wkg0hA

💁🏻‍♀️ TIL: 🦅💨 The nankeen #kestrel, a tiny Australian #falcon, flies with exceptional stability in turbulent winds, inspiring one international #research team.

Wind tunnel #experiments showed wing and tail extensions helped #birds maintain lift and reduce #flight irregularities. The team aims to integrate these features into small #drones as #climatechange increases atmospheric #turbulence.

👉 https://www.popsci.com/technology/falcon-aircraft-turbulence/

#biomimicry #nankeekestrel #engineering #robotics #climate #aviation #australia #animals #technology #tech

Droplets in dense sprays live much longer than expected. The surrounding vapor saturates locally, delaying evaporation.

What controls the system is not the droplet, but the evolving vapor field.

🔗 https://journals.aps.org/prfluids/abstract/10.1103/ms1r-7jb9

#PhaseChange #Evaporation #Turbulence #Droplets #Physics

“Inferno”

Nothing showcases the incredible power of our atmosphere like storms, and no one does stormchase photography like Mike Olbinski. In this vignette, he shows a stunning line of supercells caught near sunset on July 17, 2022. The high shear–combined with the setting sun–put on an incredible show. Dust blown up in a haboob, microbursts and downpours in the distance, and lots of churning, roiling turbulence. (Video and image credit: M. Olbinski)

From coffee-like swirls to atmospheric chaos, a data-driven model reproduces turbulent particle motion across scales using auto-regressive learning with memory effects.

https://phys.org/news/2026-05-driven-captures-dynamics-turbulence-scale.html

#turbulence #AI #fluiddynamics #machinelearning #physics

On Dolphin Turbulence

Dolphins are such fast and agile swimmers that, naturally, scientists have long wanted to understand how they swim so well. A recent study draws on numerical simulation to analyze the flow a dolphin creates when flapping its tail.

The resulting flow is highly turbulent–researchers were only able to simulate up to a fraction of a dolphin’s actual Reynolds number–with both large-scale vortices and a cascade of smaller ones. The largest vortices, shown here in white, form on the upper and lower surface of the dolphin’s tail, then slide off the tail in a vortex ring. It’s these vortex rings, the researchers found, that provide the bulk of a dolphin’s thrust.

The smaller-scale vortices, in contrast, get formed by the large vortices, and they make little to no contribution to the dolphin’s propulsion. Interestingly, these results suggest that we might be able to describe the propulsion of dolphins and other highly turbulent swimmers by focusing only on the largest scales in the flow. (Video, image, and research credit: Y. Motoori et al.; via Ars Technica)

What does turbulence look like in a quantum fluid?

Researchers are exploring how Bose–Einstein condensates shift from weak to strong turbulence, revealing how energy cascades behave when quantum mechanics takes over.

🔗 https://physicsworld.com/a/what-happens-when-a-bose-einstein-condensate-becomes-turbulent/

#QuantumPhysics #Turbulence #BEC #FluidDynamics #physics

Continuous injection and advection of Lagrangian passive tracers into a grid MHD cosmological (ENZO) simulation, to track where matter goes as function of time. Still testing stuff with my @julialang code run in post-processing over many saved snapshots. Complex flow and baryons circulation patters even under just the "simple" effect of gravity and fluid-dynamics.

#SimulatedUniverses #astrophysics #science #turbulence

Final report reveals #truth behind deadly #SingaporeAirlines flight SQ321 #turbulence
" #SIA said tt across 29,000 #Boeing777 flights btw May 2023 & July 2025, 12 cases of under-detection, 4 cases of overdetection & 20 cases of not detecting inclement weather were logged. Te SQ321 aircraft accounted for 1 of te non-detection cases & 2 of te under-detection cases. When te #aircraft was flown back to🇸🇬 fr BKK aft te incident, indicat'ns of under-detection also occurred"🧐 1/2
https://www.scmp.com/news/asia/southeast-asia/article/3354218/final-report-reveals-truth-behind-deadly-singapore-airlines-flight-sq321-turbulence?utm_source=rss_feed

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)

Recreating Atmospheres

In planetary atmospheres, energy and vorticity can cascade from large scales to smaller ones, but the mechanics of this transfer remain somewhat elusive. In a recent experiment, researchers built a lab-scale representation of an atmosphere using a meter-scale rotating annular tank. The outer bottom edge of the tank gets heated–representing the sun’s warming at the equator–while a pipe in the center of the tank gets cooled near the tank surface, which mimics the chilling effect of the poles. Researchers filled the tank with a water-glycerol mixture and recorded how their artificial atmosphere responded at different rotation rates.

The results show an energy spectrum that’s consistent with atmospheric observations–with a steep drop at large length scales and a flatter one at smaller scales. But interestingly, they also found that the cascade was temperature-dependent in ways that current models don’t predict. Untangling that effect could help us understand not only our atmosphere but those of other planets. (Image credit: tank – H. Scolan, animation – S. Ding et al.; research credit: S. Ding et al.; via APS)

“Sidewall Symphony”

Flow visualization is both an art and science in fluid dynamics. Here, researchers were interested in studying the separation bubble that forms over a backward-facing ramp–a shape that shows up, for example, on an aircraft. In these areas, the flow over the surface separates, leaving an unsteady, recirculating bubble.

That’s the flow that researchers are visualizing here. They’ve done so by adding tiny helium-filled soap bubbles to the flow. With bright lights illuminating the bubbles, each one leaves a streak in a photograph, showing where the bubble moved during the time the camera’s shutter was open. Although images like these are beautiful, they can also be analyzed by computers to extract the underlying flow that created the image. (Image and research credit: B. Steinfurth et al.; see also here)

@vale Still, I was surprised just `filter: url(#turbulence)` on the parent element would have that much impact.

Weekly Update from the Open Journal of Astrophysics – 07/02/2026

It’s Saturday once more so time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further six papers, bringing the number in Volume 9 (2026) to 24 and the total so far published by OJAp up to 472.

I will continue to include the posts made on our Mastodon account (on Fediscience) to encourage you to visit it. Mastodon is a really excellent service, and a more than adequate replacement for X/Twitter which nobody should be using; these announcement also show the DOI for each paper.

The first paper to report this week is “The Impact of Star Formation and Feedback Recipes on the Stellar Mass and Interstellar Medium of High-Redshift Galaxies” by Harley Katz (U. Chicago, USA), Martin P. Rey (U. Oxford, UK), Corentin Cadiou (Lund U., Sweden) Taysun Kimm (Yonsei U., Korea) and Oscar Agertz (Lund). This paper was published on Monday 2nd February 2026 in the folder Astrophysics of Galaxies. It introduces MEGATRON, a new model for galaxy formation simulations, highlighting that feedback energy controls star formation at high redshift and highlighting the importance of the interstellar medium.

The overlay is here:

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/116000695648050758

The second paper is “Photometric Redshifts in JWST Deep Fields: A Pixel-Based Alternative with DeepDISC” by Grant Merz (U. Illinois at Urbana-Champaign) and 6 others, all based in the USA. This paper was published on Monday February 2nd 2026 in the folder Instrumentation and Methods for Astrophysics. This paper explores the effectiveness of the DeepDISC machine learning algorithm in estimating photometric redshifts from near-infrared data, demonstrating its potential for larger image volumes and spectroscopic samples

The overlay for this one is here:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/116000777572439111

Next, published on Wednesday 4th February in the folder Astrophysics of Galaxies, is “Inferring Interstellar Medium Density, Temperature, and Metallicity from Turbulent H II Regions” by Larrance Xing (U. Chicago, USA), Nicholas Choustikov (U. Oxford, UK), Harley Katz (U. Chicago) and Alex J. Cameron (DAWN, Denmark). This paper argues that supersonic turbulenc affects the interpretation of H II region properties, potentially impacting inferred metallicity, ionization, and excitation from in nebular emission lines, motivating more extensive modelling.

The overlay is here:

The official version can be found on arXiv here and the Fediverse announcement is here:

https://fediscience.org/@OJ_Astro/116011384659092223

The fourth paper this week, also published on Wednesday 4th February, but in the folder Solar and Stellar Astrophysics, is “A Systematic Search for Big Dippers in ASAS-SN” by B. JoHantgen, D. M. Rowan, R. Forés-Toribio, C. S. Kochanek, & K. Z. Stanek (Ohio State University, USA), B. J. Shappee (U. Hawaii, USA), Subo Dong (Peking University), J. L. Prieto Universidad Diego Portales, Chile) and Todd A. Thompson (Ohio State). This study identifies 4 new dipper stars and 15 long-period eclipsing binary candidates using ASAS-SN light curves and multi-wavelength data, categorizing them based on their characteristics.

Here is the overlay:

The official version can be found on arXiv here and the Fediverse announcement is here:

https://fediscience.org/@OJ_Astro/116011460612040834

Fifth, and next to last this week we have “Unveiling the drivers of the Baryon Cycles with Interpretable Multi-step Machine Learning and Simulations” by Mst Shamima Khanom, Benjamin W. Keller and Javier Ignacio Saavedra Moreno (U. Memphis, USA). This paper was published on Thursday 5th February 2026 in the folder Astrophysics of Galaxies. This study uses machine learning methods to understand how galaxies lose or retain baryons, highlighting the relationship between baryon fraction and various galactic measurements.

The overlay is here:

The accepted version can be found on arXiv here, and the fediverse announcement is here:

https://fediscience.org/@OJ_Astro/116016883984380622

Finally for this week we have “The Bispectrum of Intrinsic Alignments: II. Precision Comparison Against Dark Matter Simulations” by Thomas Bakx (Utrecht U., Netherlands), Toshiki Kurita (MPA Garching, Germany), Alexander Eggemeier (U. Bonn, Germany), Nora Elisa Chisari (Utrecht) and Zvonimir Vlah (Ruđer Bošković Institute, Croatia). This paper was accepted in December, but publication got delayed by the Christmas effect so was published on February 6th 2026, in the folder Cosmology and Nongalactic Astrophysics. This study uses N-body simulations to accurately measure three-dimensional bispectra of halo intrinsic alignments and dark matter overdensities, providing a method to determine higher order shape bias parameters.

The overlay is here:

You can find the published version of the article here, and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116022562915557971

And that concludes this week’s update. I will do another next Saturday.

Our fleet of #multicopter​s is growing as we prepare for our part in the #TeamX¹ campaign in 🇦🇹 #Austria next month.

We'll provide valuable in-situ #temperature, #humidity, #wind and #turbulence measurements with our custom meteorological PARASITE system on multiple copters in parallel across the Inn valley. This data will help with understanding wind shear in mountainous regions and eventually improve
#mountainWeather forecasts.

Our PARASITEs carry several atmospheric sensors and we derive the turbulent 3D wind vector from the copter movements. @nobodyinperson suggested to name them like #BugsLife characters 🐛😉. He put a nicely customized ❄️ #NixOS in there to stay in control of the software, integrate it all and sync data e.g. to a #forgejoAneksajo instance (#forgejo with #gitAnnex support), our own or the one of @fzj_rdm during the VITAL campaign last year.

#Austria #Österreich #Inntal #Innsbruck #meteorology

¹https://www.teamx-programme.org/observational-campaign/

Simulating a Sneeze

Sneezing and coughing can spread pathogens both through large droplets and through tiny, airborne aerosols. Understanding how the nasal cavity shapes the aerosol cloud a sneeze produces is critical to understanding and predicting how viruses could spread. Toward that end, researchers built a “sneeze simulator” based on the upper respiratory system’s geometry. With their simulator, the team mimicked violent exhalations both with the nostrils open and closed — to see how that changed the shape of the aerosol cloud produced.

The researchers found that closed nostrils produced a cloud that moved away along a 18 degree downward tilt, whereas an open-nostril cloud followed a 30-degree downward slope. That means having the nostrils open reduces the horizontal spread of a cloud while increasing its vertical spread. Depending on the background flow that will affect which parts of a cloud get spread to people nearby. (Image and research credit: N. Catalán et al.; via Physics World)

#aerosols #biology #coughing #COVID19 #diseaseTransmission #droplets #flowVisualization #fluidDynamics #physics #science #sneezing #turbulence

“Trinity”

Inspired by the film Oppenheimer, artist Thomas Blanchard created “Trinity,” a short film imagining a nuclear explosion with macro-scale fluid motion. There’s clever video editing and compositing in this video, but no CGI. Instead, Blanchard filmed fire, sparklers, alcohol inks, pigments and more up close and in stunning detail. As always, his work is a reminder of the amazing possibilities of analog-based art. (Video and image credit: T. Blanchard)

#droplets #fluidDynamics #fluidsAsArt #marangoniEffect #physics #science #turbulence

These "rare" severe turbulence events are getting pretty common.. and deadly #TrainMasterRace

https://youtube.com/watch?v=Wb4Ht39xxJ8

#bombardier #aviation #turbulence #deadly #deadlyTurbulence #virginia #newhampshire #NTSB #keene #leesburg #bradley #airport #severeTurbulence