📄 Star formation and feedback in smoothed particle hydrodynamic simulat…

Quicklook:
Stinson, Greg et al. (2006) · Monthly Notices of the Royal Astronomical Society
Reads: 176 · Citations: 732
DOI: 10.1111/j.1365-2966.2006.…

🔗 https://ui.adsabs.harvard.edu/abs/2006MNRAS.373.1074S/abstract

#Astronomy #Astrophysics #Galaxies #Supernovae #Hydrodynamics

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)

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.

🔗 https://pubs.aip.org/aip/pof/article-abstract/38/3/033605/3382598/Slip-length-estimation-and-flow-reconstruction?redirectedFrom=fulltext

#fluiddynamics #interfacialflows #SlipLength #hydrodynamics #physics

When a thin interfacial layer reconfigures macroscopic flow.

🔗 https://journals.aps.org/prfluids/abstract/10.1103/hcyb-7nhz

#InterfacialPhysics #Hydrodynamics #NonlinearDynamics #Multiphase

🌊 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

An aircraft that can reduce fuel burn by over 60% by using "laminar-flow aerodynamics" (as well as other technologies like "precision all-carbon-fiber composites") has been produced, or so it is claimed, by an aerospace startup company, Otto Aerospace, which announced its first fleet customer will be Flexjet, although deliveries won't begin until 2030.

https://ottoaerospace.com/news/otto-aerospace-secures-historic-300-aircraft-order-with-flexjet/

#aerospace #aviation #hydrodynamics

HydroSpread:
#soft #robotics #hydrodynamics #research #science
🤖

https://scitechdaily.com/engineers-create-soft-robots-that-can-literally-walk-on-water/

Check out this absolute stonker of a figure by Philippe Delache in 1977.

(I originally found the figure reproduced in the textbook Turbulence by Uriel Frisch. I have it hanging on my office wall...)

This post inspired by @grimalkina talking about hiking and flow(s) in a totally different context.

#hydrodynamics #physics #climbing

Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh

https://wwwmpa.mpa-garching.mpg.de/~volker/arepo/

#HackerNews #GalilieanInvariant #CosmologicalSimulations #MovingMesh #Hydrodynamics #Astrophysics

Weekly Update from the Open Journal of Astrophysics – 24/05/205

It’s  time once again for the regular Saturday update of papers published during the past week at the Open Journal of Astrophysics. Since the last update we have published three new papers, which brings the number in Volume 8 (2025) up to 62 and the total so far published by OJAp up to 297.

In chronological order of publication, the three papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.

The first paper to report is: “Jet-shaped filamentary ejecta in common envelope evolution” by Ron Schreier, Shlomi Hillel and Noam Soker (Technion, Haifa, Israel). This paper, which was published on Monday May 19th 2025 in the folder High-Energy Astrophysical Processes, presents three-dimensional hydrodynamical simulations of common envelope evolution of a neutron star inside the envelope of a rotating red supergiant with Rayleigh-Taylor instabilities forming filamentary ejecta.

The overlay is here:

You can find the officially accepted version on arXiv here.

Second one up is “Weighing The Options: The Unseen Companion in LAMOST J2354 is Likely a Massive White Dwarf” by M. A. Tucker, A. J. Wheeler & D. M. Rowan (Ohio State University, USA) and M. E. Huber (U. Hawaii, USA). This paper was published on Tuesday 20th May 2025 in the folder for Solar and Stellar Astrophysics. It discusses a spectroscopic study of the binary system LAMOST J235456.73+335625 (J2354) with a discussion of the implications for the nature of the dark component.

The overlay is here:

You can find the officially-accepted version of the paper on arXiv here.

The third and last paper of the week, published on Thursday May 22nd 2025, also in the folder Solar and Stellar Astrophysics, is “How to use Gaia parallaxes for stars with poor astrometric fits” by Kareem El-Badry (Caltech, USA).  This paper presents a method for extracting reasonable estimates of stellar parallaxes from Gaia data when the overall astrometric solution is unreliable due to errors and noise

Here is the overlay:

You can find the officially accepted version of this paper on arXiv here.

That’s all the papers for this week. Looking at the publishing workflow, I expect we will pass the 300 mark next week. We’ll see when I post the next update next Saturday.

#arXiv240719004v2 #arXiv250109663v3 #arXiv250411528v2 #astrometry #binaryStars #commonEnvelopeEvolution #DiamondOpenAccess #GAIA #HighEnergyAstrophysicalPhenomena #hydrodynamics #LAMOSTJ2354 #LAMOSTJ23545673335625 #OpenJournalOfAstrophysics #parallax #SolarAndStellarAstrophysics #stars #TheOpenJournalOfAstrophysics #whiteDwarfs