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I get the following error while running the turbulence models. Error occurs after execution of first time step However if i switch to laminar, the model runs easily. Why is this happening.
Most likely to do with problem setup - either boundary condition (likely inflow) or nodal initial conditions or a combination. Can you post the related .inp file?
Are you using K-Omega model? It seems like a division by Zero kind of error. Something has wrong value in the input.