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Time per iteration increases for large problems |
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#1 |
New Member
Ron Efrati
Join Date: Mar 2023
Posts: 5
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Hello,
I am using SU2 for simulations at transonic Mach numbers. I have encountered an increase in time per iteration for large problems (50M+ cells). For example, I found that at the beginning of the simulation it took 20s per iteration, but after about 1000 iterations it took 50s per iteration. I suspected that the number of iterations needed for the convergence of the linear solver increases with time, so I exported LINSOL as screen output. However, I found out that at all times the linear solver converged after 6 iterations. It is worth mentioning that when I restart the simulation from previous iteration, the time per iteration reverts back to 20s from 50s. Has anyone encountered this problem before? Thank you. |
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#2 |
Senior Member
Pedro Gomes
Join Date: Dec 2017
Posts: 466
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No this seems odd. Can you share the config, version of the code, etc. Can you monitor how much memory is being used and if it increases in time?
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#3 |
New Member
Ron Efrati
Join Date: Mar 2023
Posts: 5
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Documents.zipHi, of course, the input file and the corresponding output are attached. You can see that the time per iteration increases dramatically. As I mentioned before, when I restart the simulation the time reduces back to normal. Lately I found out that when I run an unsteady simulation, the time reduces back at each time iteration, namely it only increases with inner iterations. The output of the unsteady simulation is attached as well. I used version 7.5.1. I did not check the memory usage during the simulation, but it stands close to 50% at most times (I run the simulation on a shared memory machine).
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#4 |
Senior Member
bigfoot
Join Date: Dec 2011
Location: Netherlands
Posts: 585
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Do you have the su2 mesh as well?
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#5 |
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Ron Efrati
Join Date: Mar 2023
Posts: 5
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