|June 18, 2006, 14:01||
I have to run a case with laminar unsteady flow. I wrote the UDF that describes the unsteady velocity profile, hooked it up to Fluent. But the simulation seems to be outrageously slow. I even changed to second order upwinding, reduced the relaxation factors. Even then, there's no improvement.
After about 151 iterations (my time step size is 0.01 with 400 time steps), I get an error mesage that says:
Error: divergence detected in AMG solver: y- momentum
Error Object )
What does this mean and how can it be corrected?
Any opinions/ suggestions?
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