Obstructed internal flow - convergence stall
I'm modelling an unsteady 2D channel flow with a semi-circular obstruction located midway through the channel. The inlet velocity is uniform but is gradually increased (from zero) with time.
I noticed that after a certain inlet velocity, the solver residual is not monotically reducing as before - instead the convergence is somewhat stalled !?
Why is that ?
And, how could this be overcome ?
Appreciate all the response.
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