I am trying to simulate a pressure drop across a post combustion chamber. The fluid material moving through is air at very lower speeds and pressure, so we can assume it is incompressible.
I am having problems with a diverging velocity result.
The first run was successful and the conditions I used to set it up were high (just to test the simulation). I used a pressure inlet and a volumetric flow outlet. When changing the boundary conditions on consequent runs to a more realistic scenario, the simulation always fails and returns an error of diverging velocity results at a point near the inlet.
As you can see first run is successful and others fail, can anyone please asssist?