||August 20, 2011 18:40
Originally Posted by Ford Prefect
Do you run a transient or steady state solver?
If the convergence is well behaved then more iterations will generally lead to lower residuals. This is a good thing (to a point) in a steady state solver, but it might not be necessary within a transient solver. I would suggest that you put an iteration number so that you will reach convergence for your variables within most of the time-steps.
If I am wrong please correct me.
If you set an "iteration number" (I guess, you meant maximum iteration) and the solution does not converge to a desired value within a time step, then iteration error will start accumulating. Unless those errors are convected out with the flow, and the solution starts converging to the desired value, your simulation will have high iteration error. For an accurate simulation, generally the minimum number of (non-linear) iterations is set.