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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › Diverging Results with density based solver › Reply To: Diverging Results with density based solver

November 15, 2023 at 4:15 pm
Matt Jones
Subscriber

 

I tried using a timestep of 1e-7, and it seemed to be working better. The only problem is that I’ve seen multiple papers use a timestep of 1e-5 and 1e-6. So it seems weird that this problem is happening to me and that it is diverging from the inflation layers.

The bigger problem is that after I get the steady state solution, I simply changed it to transient with a timestep of 1e-5 (nothing else is changing). Ideally it shld converge instantly, but after a few iterations it started diverging.

I saved the residuals for postprocessing and observed where the residuals were high. and it was really high in some parts of the inflation layers.
This is confusing because none of these problems happen when using pressure based solver