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#fluidmechanics

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Oceans Craig

You’d think I learn - accidentally found myself in a decent physical bookshop. Among the haul is this lovely work. “Clouds” - a perfect for me mix of #fluidmechanics and #art… illustrations are line drawings or art works… you know the sort - Turner, van Gogh, Ruskin etc. plus heaps new to me - #clouds - now.. to find time to read it properly instead of doomscrolling. 😐 #UnityBookshop

ScienceOpen

'Two-group bubble size distribution evolution in vertical two-phase flow: Mechanistic model development and evaluation in a tight-lattice rod bundle' - a 'National Science Open' article published by @EDPSciences on #ScienceOpen:

🔗 scienceopen.com/document?vid=d

ScienceOpenTwo-group bubble size distribution evolution in vertical two-phase flow: Mechanistic model development and evaluation in a tight-lattice rod bundle<p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="first" dir="auto" id="d10033496e243">Two-phase flow with complex phase interfaces is commonly observed in both nature and industrial processes. The bubble size distribution (BSD) is a crucial parameter in gas-liquid two-phase flow, impacting various flow characteristics including interfacial forces, void fraction distribution, and interfacial area transport. Throughout the flow progression, the BSD changes along the channel due to variations in pressure and interactions among bubbles. Accurately predicting the evolution of BSD can enhance the modeling of two-phase flow. This study presents a novel BSD evolution (BSDE) model, where the governing equation for the probability density function is formulated by considering the conservation of bubbles within a one-dimensional control volume in the channel. The downstream BSD is predicted based on the upstream BSD and the effects of pressure variations and bubble interactions along the channel. To account for the multiscale nature of the two-phase flow, the bubbles are categorized into small groups ( <i>G</i> <sub>1</sub>) and large groups ( <i>G</i> <sub>2</sub>). Six distinct source term distributions for intra/inter bubble interactions have been developed. Each source term accounts for the distributions of consumed and generated bubbles, ensuring the conservation of bubble volume through constraints on model coefficients. The model has been tested on a tight-lattice rod bundle using experimental data, with deviations of less than 5% and 15% for <i>G</i> <sub>1</sub> and <i>G</i> <sub>2</sub> flow, respectively. Since the model development is independent of specific geometry, the framework of the BSDE model can also be effectively applied to channels of varying shapes. </p>
#Research#Engineering#FluidMechanics
Jochen Fromm

Three mathematicians have derived the fundamental PDEs of #FluidMechanics, such as the compressible Euler and incompressible Navier-Stokes-Fourier equations, starting from hard sphere particle systems undergoing elastic collisions. They claim it resolves #Hilbert's sixth problem. By mathematically proving how individual molecules create the complex motion of #fluids, the three mathematicians could have helped to illuminate why time can not flow in reverse.
quantamagazine.org/epic-effort

Quanta Magazine · Epic Effort to Ground Physics in Math Opens Up the Secrets of Time | Quanta MagazineBy mathematically proving how individual molecules create the complex motion of fluids, three mathematicians have illuminated why time can’t flow in reverse.
Oceans Craig

flying north from Ōtautahi yesterday afternoon and this had all the #FluidMechanics - waves, sunglint on braided rivers, clouds, and best of all lift keeping us in the air. Unfortunately the latter was a little conditional as we had some engineering issues that sent us back to CHC and so my dreams of a nice friday afternoon cuppa at home evolved into two more flights to get home about 1030pm and not in the mood for a cuppa. #FirstWorldProblems

*
Pustam | पुस्तम | পুস্তম🇳🇵

An Article in the Annual Review of Condensed Matter Physics on Turbulence by KR Sreenivasan and J Schumacher
annualreviews.org/content/jour

What is the turbulence problem, and when can we say it’s solved? 🌪️ This deep dive by Sreenivasan & Schumacher explores the math, physics, and engineering challenges of turbulence—from Navier-Stokes equations to intermittency and beyond. A must-read for anyone fascinated by chaos, complexity, and the unsolved mysteries of fluid dynamics! 🌀

A summary of the talk presented by KR Sreenivasan in December 2023 at the International Center for Theoretical Sciences (ICTS-TIFR) in Bengaluru, as part of a program on field theory and turbulence.
youtube.com/watch?v=fwVSBYh-KC

"Field Theory and Turbulence" program link: icts.res.in/discussion-meeting

#FluidDynamics #Physics #NavierStokes #UnsolvedMystery #Mechanics #Dynamics #FluidMechanics #Science #Chaos #TurbulentMotion #Randomness #Chaotic #Fluid #ClassicalMechanics
#Turbulence

Droppie [infosec] 🐨♀:archlinux: :kde: :firefox_nightly: :thunderbird:🦘:vegan:​

Just took a break from my pooter to heave my corpulent meatsack self to my ensuite to belatedly brush my teeth after brekkie. Stooped over my handbasin, doing the doings, i realised that parts of my face were being randomly splashed, so i returned my mind from zooming along the astral plane to consider what might be happening.

Realised that i'd forgotten to turn the cold tap fully off as i began brushing, that the combo of its consequent partial valve opening, the cooler than usual day, & the local water pressure today had combined to make the resultant waterflow's #ReynoldsNumber fully turbulent, not laminar. Furthermore, the ensuing randomness of its flow in this mode was such that often it was striking the basin drain grate grills rather than falling cleanly thru the gaps, & was rebounding aka splashing. Finally, my stoop was sufficient that my face happened to be in just the right range to intersect with this mild local splashing.

These contemplative revelations pleased me. It was a nice little low-key local demonstration that no matter the pomposity, arrogance, & suicidal determination of the ridiculous human species, the principles of #physics, #thermodynamics, #fluidmechanics, & #chaostheory will always prevail.

But i expect such thoughts regularly cross the minds of most peeps as they do their routine ablutions... 🤷‍♀️ 🤭 😜

#existentialism#misanthropy#ClimateCrisis
pglpm

Dear fellow physics teachers (especially of continuum-mechanics-related disciplines): do you have any suggestions, thoughts, personal experiences, and references about nice *graphical representations* of the flux of a vector quantity – for instance momentum flux (in momentum transport)?

Cheers!

PS: what tags can be good & appropriate for a request like the present one?

#physicseducation#physics#continuummechanics
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