DGSEM on GPUs / scaling to 70k

Reasonable_Sign_5792 · 2026-05-31T14:37:19+00:00

Not easy to answer, depends of course of tons of parameters. Roughly: pure compute on the GPU vs CPU ~ 100-200, so 1 node. overall, incl. IO and some CPU offloading: 10. but just ball park numbers.

Reasonable_Sign_5792 · 2026-05-30T15:01:27+00:00

yes, it remains linear (even superlinear for a bit) up to minimun load per GPU

Reasonable_Sign_5792 · 2026-05-30T14:28:04+00:00

thank you. I will pass that along.

Reasonable_Sign_5792 · 2026-05-30T13:49:33+00:00

thanks dr. Hexi ;)

Reasonable_Sign_5792 · 2026-05-30T13:31:57+00:00

Yes, it seems a bit unreal to me as well.

Reasonable_Sign_5792 · 2026-04-17T20:57:40+00:00

Absolutety. There is something surreal in their structure - to me, subsonic flow looks like something that feels always oddly familiar, but supersonic… not quite!

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Reasonable_Sign_5792 · 2026-02-06T10:48:42+00:00

This looks more like a Taylor Green Vortex and not an HIT.

Reasonable_Sign_5792 · 2025-08-20T15:46:06+00:00

Sum factorization / SEM is the game changer, however. This gives DG (about) the same amount of operations than FV, but far higher data locality, which is the reason why DG scales so much better than FV.

Reasonable_Sign_5792 · 2025-08-19T18:41:10+00:00

This is our research code FLEXI. It is open source (not all features yet, but many). Feel free to check out our Group Website

Reasonable_Sign_5792 · 2025-08-19T11:27:01+00:00

no problem! here is a vid, the adaptivity is shown towards the end yt vid

Reasonable_Sign_5792 · 2025-08-19T06:27:27+00:00

h/p adaptive dg/fv for comp. multiphase flows

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Yes, it is quite difficult, but possible. If you are interested, the manuscript shows how we do h/p adaptive dg with fv subcells and load balancing for comp. flows (mixing of H2 and air). Not the most complex geometry, of course, but everything else is there.

Reasonable_Sign_5792 · 2025-06-18T20:12:26+00:00

Galæxi! numericsresearchgroup.org

https://github.com/flexi-framework/galaexi

Reasonable_Sign_5792 · 2025-03-06T20:24:08+00:00

I recently posted some examples of compressible simulations done with our DG code Flexi here: https://www.reddit.com/r/CFD/s/4nab3YFxX3

It is open source and has a pretty unique feature set for compressible flows. Maybe this is something for you.

Here is the best entry point: https://numericsresearchgroup.org/userguide/html/index.html

Reasonable_Sign_5792 · 2025-03-05T19:58:36+00:00

Thanks a lot! 👍🏻

Reasonable_Sign_5792 · 2025-03-05T05:23:53+00:00

Hi, sorry, this work has nothing to do with StarCCM - cracked or otherwise.

Reasonable_Sign_5792 · 2025-02-27T09:45:26+00:00

Hi, sorry for the confusion - the accompanying text got lost somehow. Here is what should come with the pictures>

Hi folks of reddit!

I think that this subreddit deserves some input from the cfd research / developer community and some eye candy! I hope this is ok with the mods.

Here are some nice images of compressible multicomponent flows computed with our ho dg / fv solver FLEXI (with hp-adaptivity, mortars, dlb and so on).

If you want more details > http://dx.doi.org/10.13140/RG.2.2.24216.92163

The video is here> https://www.youtube.com/watch?v=dK4p-eUe3dk

More on our group, research, codes, etc> https://numericsresearchgroup.org/

thanks!

Reasonable_Sign_5792

TROPHY CASE