High Courant number
I am performing LES of a roundjet using OpenFOAM. SGS model is smagorinsky.
Upto around 12500 time steps my courant number was well below 1 (0.5-0.7). After that it has been increasing and, now at 13750 iterations, it is ~14. Is the solution right? I am using a time step 5e-5. Why is this sudden increase in courant number happening? |
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I am surprised why this instability has come up after these many timesteps
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@Arun... The error usually builds up during iterations, try to add under-relaxation factor to the variables. Also, re-check your mesh. |
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