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Error while running pisoFOAM

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Old   July 17, 2010, 18:19
Default Error while running pisoFOAM
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Anonymous
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I got the following error message while running pisoFOAM for external flow. What are the possible ways to handle this issue?

Thanks,



Time = 0.0018

Courant Number mean: 0.0371583 max: 1360.14
smoothSolver: Solving for Ux, Initial residual = nan, Final residual = nan, No Iterations 1000
smoothSolver: Solving for Ux, Initial residual = nan, Final residual = nan, No Iterations 1000
smoothSolver: Solving for Uy, Initial residual = nan, Final residual = nan, No Iterations 1000
smoothSolver: Solving for Uy, Initial residual = nan, Final residual = nan, No Iterations 1000
smoothSolver: Solving for Uz, Initial residual = nan, Final residual = nan, No Iterations 1000
smoothSolver: Solving for Uz, Initial residual = nan, Final residual = nan, No Iterations 1000
2 total processes killed (some possibly by mpirun during cleanup)
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Old   July 19, 2010, 06:18
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Rasoul
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First, try with the smaller value for the timeStep.
Your max. courant number is high.
if the problem still exists, try with a refined mesh.

regards,
Rasoul
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Old   July 20, 2010, 02:44
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matej forman
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another few things to try:
(a) double/triple/quatro check your BC settings.
(b) think about your initial conditions. do you start from zero or some converged solution
(c) have a look where is your Co so high.

good luck
matej
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