[Ankit Patel]

Hello everyone!

I am using ANSYS Fluent 2020 R1 for simulation of compressible air. I have attached one sample of isomeric geometry for which simulation have to carried out. The experiment is all ready carried out and I have to carried out simulation for same.

Boundary Conditions,
Inlet: Pressure (7 bar, Fixed)
Outlet: Pressure (Varying between 6.5 bar and 3 bar)
Wall: Stationary wall, no slip
Target: To find mass flow rate for all boundary conditions

The steady, compressible and fully developed turbulent flow is there. From experimental data, the range of Mach number between 0.3 to 1.15 for given boundary conditions.

I have carried out simulation for one boundary condition with pressure based solver and density based solver and my mesh is fine for both the solvers. The result by pressure based solver is more nearer to experimental result compared to density based solver. For pressure based solver, SIMPLE scheme is used for PV coupling with second order upwind to other equations. For density based solver implicit formulation is used with second order upwind to other equations.

Questions:
(1) Which solver results should I consider for given Mach number range for my case?
(2) Are there any relation available for Mach number and selection of solver?

Thanks in advance.