TELEMAC-MASCARET Forum: SIMULATION STOPPED DUE TO GUILTY POINT- MESSAGE (1/1)

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TOPIC: SIMULATION STOPPED DUE TO GUILTY POINT- MESSAGE

SIMULATION STOPPED DUE TO GUILTY POINT- MESSAGE 7 years 7 months ago #26160

sathya	Hello, While doing tracer modeling in TELEMAC 3d, i get the following error message which causes the simulation to get STOPPED . MURD3D: ITERATION NO. REACHED 100 , STOP. ALPHA = 3.8595040309604506E-002 GUILTY POINT = 356026 I would like to know what is the cause of such error? What is meant by GUILTY POINT? How should i overcome this error? Thanks Sathya
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SIMULATION STOPPED DUE TO GUILTY POINT- MESSAGE 7 years 6 months ago #26219

v.clary

Hello,
I am experiencing sometimes the same problem (even if it is not with tracers) and might have some clues, as I looked into the code.

This error occurs while using the MURD Schemes (number 3, 4 or 5). It means that the maximum number of iteration is reached during the advection step.
Some time sub-iterations are done during this step. The new time step used there is approximately the time step you chose in the .cas file multiplied by alpha. In your case the max number of iterations was reached. (100*alpha<1 in your case).

The first thing to check is your time step :it might be too big so that 100 iterations are not enough.
But it also might be convergence difficulties.

Best regards,

Vincent

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