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Fluent error every time opening a large data file (>10 GB) with Discrete Ordinate |
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December 2, 2022, 06:22 |
Fluent error every time opening a large data file (>10 GB) with Discrete Ordinate
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#1 |
New Member
Join Date: Jan 2021
Posts: 4
Rep Power: 5 |
Dear all,
I have been working with a Discrete Ordinate radiation model (DOM) on top of using species and volumetric reaction model using a UDF. Due to the large mesh size (cell counts) as well as high number of directional discretization used in the DOM, my case files can have a size of 100ish MB while the data files range from 10 GB to 60 GB. In the HPC cluster, normally I use 128 cores to do calculations in Fluent. The cluster is AMD EPYC 7H12 2x64 cores with 512 GB RAM running in Linux. Typically I often do calculations and save the cas and dat file and then reopen to continue calculations later. Also this is used to do step-by-step calculation iterations (flow->radiation and energy->species & flow), some sensitivity testings, or testing the solver settings. The problem now is I can save the cas and dat file after doing some calculations but I cannot open the dat file when I want to open them in any future sessions. There is always an error that causes Fluent process to stop. The error message in the TUI says: Code:
Reading from nodeXXXX.XXXX.os:".../datafile.dat.h5" in NODE0 mode ... Reading results. (cx-use-window-id 51) ============================================================================== Node 0: Process 3281202: Received signal SIGSEGV. ============================================================================== The fluent process could not be started.
I am a bit running out of ideas and could find out how to solve this. Anyone here might be familiar with such issues? Is there any other step(s) that I can do also to help me understand what happens and report this error properly to the System Administrators? |
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December 2, 2022, 19:19 |
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#2 |
Senior Member
Kareem
Join Date: Nov 2022
Location: New York
Posts: 123
Rep Power: 3 |
Hello, I have received a similar SIGSEGV working with very large meshes. I solved my problem by unselecting my GPU in the Fluent launcher. For my problem I believe it was exceeding the GPU VRAM.
I know you didn't mention you were using a GPU for computing, but hope it may help! -Kareem |
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December 3, 2022, 12:10 |
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#3 | |
New Member
Join Date: Jan 2021
Posts: 4
Rep Power: 5 |
Quote:
My setting has been always with 0 GPU. So, this mean it is already done without GPU I suppose? |
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December 3, 2022, 19:19 |
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#4 | |
Senior Member
Kareem
Join Date: Nov 2022
Location: New York
Posts: 123
Rep Power: 3 |
Quote:
This is now all speculation, but maybe try turning GPGPU computing on if you have a capable card. The DO models is one of the few models that can be accelerated with a GPU. See this link for turning on the acceleration and using NVIDIA MPS: https://cfdresearch.com/ansys-fluent-cfd-post-scripts/ Other than that I am not sure where to go. I'll try to do some more research on your setup and report back if I find anything. I've always struggled to "root cause" SIGSEGV errors. Good Luck! -Kareem |
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Tags |
ansys fluent, data file, discrete ordinate model, error, received signal sigsegv |
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