How do I make my CFD run on CPU rather than GPU

Project Support
1

Hi all,

I am trying to run a simple CFD simulation of an F1 in Schools Car. I want it to be very basic. however when I try to run this it says

“Your Computing quota is not sufficient to start the job. Learn more.”

I believe this is because it is using GPU.h (which I have no allocation) rather than CPU.h which I have many hours.

this is my first simulation after the tutorial stuff so I am probably doing something very wrong or silly!

Project Link: https://www.simscale.com/workbench/?pid=4865895230170232701&mi=spec%3Add46003b-68eb-43c9-8f5a-59be063123c2%2Cservice%3ASIMULATION%2Cstrategy%3A5 - not sure others can access as it only allows me to “share with support”

Thanks!

2

Hi MrSchramm,

Thanks for reaching out to us on the forum. You are right, it is trying to use GPU hours instead of CPU because the simulation you are trying to run is an ‘LBM’ simulation. LBM uses GPU hours. The plan you are on currently does not include GPU hours and therefore cannot run a simulation with LBM. Please use the regular incompressible simulation instead and things should work just fine!

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Best,
Satvik

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3

Hi there! As an additional comment on @shenoy’s reply, there is an option import for STL files called “Optimize for LBM / PWC”. When it’s toggled on, the CAD will be imported as a facet only geometry and will only be fit to be used in PWC/LBM simulations - make sure it’s toggled off!

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