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Problem diverges or not depending on procs number

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Old   August 28, 2018, 04:01
Default Problem diverges or not depending on procs number
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I'm running a hypersonic RANS simulation using rhoCentralFoam.

For one of the problem, I found that when I'm using 288 procs, the solution diverges when solving for omega. However, it continues running if I use 600 procs. I'm still running now but at 288 procs, it diverges at 1.2e-5s. However, with 600 procs, it is now at 7.7e-4 s.

May I know why this is so? I'm using the same solver and nothing else has been changed.

For my omega, it is:

smoother DILUGaussSeidel;
nSweeps 2;
tolerance 1e-7;
relTol 0.05;
solver BICCG;//smoothSolver;
preconditioner DILU;
tolerance 1e-07;
relTol 0.05;

Is it a bug? I'm using OF3.0 btw.
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