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February 18, 2022 at 9:44 am
Rob
Forum Moderator
The blockage might help the stability depending on what that does to the overall pressure loss. Equally it could lead to all sorts of interesting flow separation effects so cell count and meshing are going to be important. You do need to refine the mesh into the chamber as that's where all the interesting things are going to happen.
Pressure based (Coupled Solver) is good to Mach 2-3 and I'm told pretty good for higher Mach Numbers. I very rarely use the density based solver, in fact I can't remember last time I did other than the check a tutorial for a colleague. For density based you'll need to be more careful with the mesh and look at the Courant Number settings very carefully. PBCS may need the pseudo time step reducing to 0.1-0.2 or the courant number to around 25-50 (depending on the options you pick) but should otherwise behave. As you're using Fluent I'd post process in Fluent too, it's quicker.
Pressure based (Coupled Solver) is good to Mach 2-3 and I'm told pretty good for higher Mach Numbers. I very rarely use the density based solver, in fact I can't remember last time I did other than the check a tutorial for a colleague. For density based you'll need to be more careful with the mesh and look at the Courant Number settings very carefully. PBCS may need the pseudo time step reducing to 0.1-0.2 or the courant number to around 25-50 (depending on the options you pick) but should otherwise behave. As you're using Fluent I'd post process in Fluent too, it's quicker.
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