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#cfd

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Dr. Moritz Lehmann

#FluidX3D #CFD v3.4 is out! With an AMD #GPU finally in my posession, I can now test FluidX3D locally on #AMD​/​#Intel​/​#Nvidia GPUs within the same PC, to guarantee full compatibility. This allowed me to identify and fix 2 critical bugs that were coding mistakes on my side yet somehow only exposed with AMD's driver. Be sure to update! 🖖🤠
github.com/ProjectPhysX/FluidX

GitHubRelease FluidX3D v3.4 (bug fixes) · ProjectPhysX/FluidX3DThank you for using FluidX3D! Finally I also have an AMD GPU in my posession, so I can test FluidX3D locally on AMD/Intel/Nvidia GPUs within the same PC, to guarantee full compatibility. This allow...
Public
concretedog

Getting a bit further with my exploration of Computational Fluid Dynamics (CFD) this evening. Using the mighty @FreeCAD I've modelled this "Ballute" style parachute and simulated it descending at 6m/s in air. The air velocity is plotted in the images. Ace to see the turbulence in the point cloud/steam chaser view. If any #CFD experts fancy a chat.... I HAVE QUESTIONS! #OpenFOAM #FreeCAD

A screenshot of a simulation. A balloon shaped parachute model is descending in a grey box with red and blue areas showing the air velocity.
A point cloud view with lots of "steam chaser" lines showing the speed and direction of air flow over the ballute style parachute.
A répondu dans un fil de discussion
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Jocelyn

@majeriisli @CCochard

I like that.
In the times when I was doing #CFD, which usually stands for computational fluid dynamics but that envious experimentalists dubbed colourful fluid dynamics, I once presented the dynamics of a gravity current in black and white, with just isolines of density.
I was very happy with the reaction of a colleague: he told me an empirical universal constant was number of colours times reliability of the numerics, so that my work was probably pretty good :)

Public
glasspshr

Hey folks, I have a friend who's a mechanical/civil engineer looking for CFD help modeling wind against a windy balcony. She's looking for a consultant:

"I have a client who has an extremely windy balcony. He wants to add wind screens but is unsure of the style and height and how far from the screen the wind will be directed. So basically we want a simulated wind model using a CAD drawing”

Let me know if that's your jam, I can hook you up.

Please boost!

#engineering#FediHire#cad
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Dr. Moritz Lehmann

This is the largest #CFD simulation ever on a single computer, the #NASA X-59 at 117 Billion grid cells. This video visualizes 7.6 PetaByte if volumetric data.

I did this simulation on 2x #Intel Xeon 6980P #HPC CPUs with 6TB MRDIMM memory at massive 1.7TB/s bandwidth. No #GPU​s required! 🖖😋🟦

youtube.com/watch?v=K5eKxzklXD

As a little gift to you all: #FluidX3D v3.0 is out now, enabling 31% larger resolution on CPUs/iGPUs with #OpenCL zero-copy buffers:
github.com/ProjectPhysX/FluidX

YouTubeLargest CFD sim ever on a single node: NASA X-59 at 117 Billion cells with FluidX3D on Intel Xeon 6Par Dr. Moritz Lehmann
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Green Planet Energy eG

Unsere Studie mit @enerbrain ist heute in den Medien: Sie zeigt, wie Verträge ( #CfD ) zur Förderung von #ErneuerbarenEnergien optimaler Weise aussehen sollten:

pv-magazine.de/2024/05/14/anal

pv magazine Deutschland · Analyse von Energy Brainpool zeigt Stellschrauben für Gestaltung von Differenzverträgen zur Erneuerbaren-FörderungDer von Green Planet Energy in Auftrag gegebenen Analyse zufolge schafft ein Mindest- und Höchstpreis Anreize für systemdienliche Betriebsmodelle. Die Ermittlung des Benchmarkpreises soll so gestaltet werden, dass sowohl Spotmarkt-Signale berücksichtigt als auch die Integration in den Terminmarkt angereizt werden.
Suite du fil
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youen

Je ne sais pas si je suis excessivement optimiste ou si ça peut marcher ^^ J'ignore le degré de confiance qu'on peut accorder à ce type de simulation.

À 25km/h, la simulation me donne une résistance de l'air de 16.5N, à comparer à la résistance de 24N pour le vhéliotech intégral standard. Donc 30% mieux, alors même que j'ai ajouté la banquette et ses deux passagers. Rien que pour ça, ce carénage partiel semble intéressant.

#vélocargo#vélomobile#cfd
Suite du fil
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youen

Pour la visibilité, j'espère m'en sortir sans devoir regarder à travers un pare-brise (car ça complique s'il faut ajouter des essuie-glace), d'où ce concept qui, selon les simulations, remonte le flux d'air au-dessus de la tête. Le conducteur devra malgré tout probablement mettre un manteau en cas de pluie. Mais pas besoin de surpantalon grâce à la protection des jambes.

Vu de côté du même véhicule (sans toit ni passagers sur cet exemple) après simulation de l'écoulement de l'air. On voit des lignes représentant le flux d'air, en rouge quand la vitesse du vent est importante, vert sinon. Le flux est dévié par le mini pare-brise et passe au-dessus de la tête du conducteur (celui-ci peut regarder par dessus le mini pare-brise)
Même vue, mais cette fois le flux d'air devant le conducteur est représenté. On voit que l'air tourbillone devant lui, mais à une faible vitesse puisque la couleur est verte.
#cfd
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Dr. Moritz Lehmann

#FluidX3D #CFD update alert! v2.15 speeds up framerate in interactive graphics by 20-70%. 🖖🥳💻

How? Turns out iterating over 2 million pixels with a single CPU core is... really slow. I did that 3 times more than necessary for every frame rendered on screen! 🖖😆
I've now eliminated a memory copy of the frame (in favor of pointer swap), and a clear frame/zbuffer operation on CPU since that's already done on #GPU.

Release notes: github.com/ProjectPhysX/FluidX

GitHubRelease FluidX3D v2.15 (framerate boost) · ProjectPhysX/FluidX3DThank you for using FluidX3D! Update v2.15 boosts framerate in interactive graphics by 20-70%: eliminated one frame memory copy and one clear frame operation in rendering chain enabled g++ compile...
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Jed Brown

🚨 Are you a PhD student interested in software for #CFD and/or fluids data analytics? The NSF Fluid Dynamics Software Infrastructure (FDSI) team at CU Boulder has 10-week paid internships (with housing) for PhD students to conduct V&V for complex flows like the Common Research Model (CRM), wind turbine blades, and fundamentals like the "speed bump" geometry. This work will involve model/workflow intercomparison and validation using experiments.

colorado.edu/center/aerospacem

Colorful oil-flow diagram for the Common Research Model (as seen on NASA's HLPW-5 website).
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Dr. Moritz Lehmann

#FluidX3D has been a visualization powerhouse from the beginning, and with update v2.14 it got even better: Now velocity, density and temperature fields can be visualized in field, slice, streamline, and Q-criterion isosurface modes, in real time while the #CFD simulation is running. 🖖😎🌊

The video below is some screen recordings to showcase the update, all real-time simulations on #IntelArc A750:
youtu.be/p32uFTQmOzE

Full release notes: github.com/ProjectPhysX/FluidX

YouTubeFluidX3D v2.14 Update TrailerPar Dr. Moritz Lehmann
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Leibniz Supercomputing Centre

With the help of #SuperMUC-NG, researchers at RWTH Aachen performed a direct numerical simulation with finite rate chemistry to investigate the influence of flame-wall interaction on CO emissions in very lean turbulent premixed methane flames:

gauss-centre.eu/results/comput

#GCS#CFD#IT4Science
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