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Simulation crashes when using high amount of processors |
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June 28, 2019, 07:05 |
Simulation crashes when using high amount of processors
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#1 |
New Member
Join Date: Jan 2013
Posts: 17
Rep Power: 13 |
Hi all,
from time to time I have the problem, that some of my simulations crash before solving the first equation. In my actual simulation it runs fine on 1 processor, 16 processors and 144 processors, but it crashes on 72 processors. I am using scotch for the decomposition. Using 72 processors, each processor has ~60000 cells. Using the same case the problem occurs also on different computers. Most of the time I am only using 16 processors for similar mesh sizes. With 16 processors the problem never occured. For me this error seems to be very arbitrary and destroys an efficient workflow completely. Any ideas? Best regards, Za-ck |
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June 28, 2019, 07:24 |
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#2 |
New Member
Join Date: Jan 2013
Posts: 17
Rep Power: 13 |
Ok, I think I have found the problem. FYI: It happens, when turbulence->validate() is called. I am initializing the velocity with zero and accelerate it afterwards. Maybe a small velocity should be initialized from beginning.
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June 30, 2019, 05:13 |
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#3 | |
Senior Member
Ruiyan Chen
Join Date: Jul 2016
Location: Hangzhou, China
Posts: 162
Rep Power: 10 |
Quote:
Whatever turbulence model you are using, you can dig into the source code and find out what it is doing in the turbulence->validate() function. This should give you enough hints. Ruiyan |
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April 7, 2022, 04:57 |
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#4 |
Member
George
Join Date: Dec 2020
Posts: 31
Rep Power: 5 |
Hello all,
Za-ck could you please elaborate how exactly you found out that the error occurs when turbulence->validate() is called? Kind regards, George |
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