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Forum: Main CFD Forum

November 1, 2013, 17:37

Replies: 8

incompressible limit for compressible codes

Views: 1,335

Posted By liuju1985

well, if the flow is incompressible, you may...

well, if the flow is incompressible, you may regard rho as a constant. Then the compressible NS degenerates to incompressible NS, where pressure is still an unknown.

OK. This is the part not...

Forum: Main CFD Forum

November 1, 2013, 17:14

Replies: 8

incompressible limit for compressible codes

Views: 1,335

Posted By liuju1985

It is not necessary to enforce div(u) = 0. ...

It is not necessary to enforce div(u) = 0.

Considering an isothermal flow, perfect gas law gives that pressure is a linear function of density. Hence, you may write density as a function of...

Forum: Main CFD Forum

November 1, 2013, 16:55

Replies: 8

incompressible limit for compressible codes

Views: 1,335

Posted By liuju1985

Thanks. I understand dp/drho is ill-defined for...

Thanks. I understand dp/drho is ill-defined for incompressible flow.

So I proposed to solve, for example isothermal NS, in terms of pressure and velocity. Hence, we may avoid solving the density....

Forum: Main CFD Forum

November 1, 2013, 16:40

Replies: 8

incompressible limit for compressible codes

Views: 1,335

Posted By liuju1985

incompressible limit for compressible codes

People have always been talking about the incompressible limit for compressible codes.

It seems to me that there are some issues there, but it is not very clear.

What would happen if one runs...

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