[Vignesh2508]

Guys,

Can anyone please explain to me about the mass outflow correction (how they work and why we should use them) and the equations involved in them. I am trying to understand them because I have come across some info, that for a compressible simulation one should use pressure outlet BC. I am trying to understand this through the equations. Please shed some light on this.

Thanks

Vicky

[FMDenaro]

Originally Posted by Vignesh2508

Guys,

Can anyone please explain to me about the mass outflow correction (how they work and why we should use them) and the equations involved in them. I am trying to understand them because I have come across some info, that for a compressible simulation one should use pressure outlet BC. I am trying to understand this through the equations. Please shed some light on this.

Thanks

Vicky

For compressible flows, the type of inflow/outflow BCs depend on the supersonic/subsonic condition. Fixing a pressure value at the outlet is possible for subsonic conditions.

[Vignesh2508]

Then is it right to use the pressure outlet BC for velocity inlet BC for incompressible simulation. Or is the pressure outlet condition limited to only compressible flows.

Thanks

[FMDenaro]

Originally Posted by Vignesh2508

Then is it right to use the pressure outlet BC for velocity inlet BC for incompressible simulation. Or is the pressure outlet condition limited to only compressible flows.

Thanks

If you solve the fully incompressible model, a Dirichlet BCs. for the pressure can be fixed but it is not necessary, you can work using the velocity BC.
However, this model is totally different from the compressible model at low Mach number