Are you modeling a compressible flow or an incompressible flow?

What are the velocity boundary conditions you wish to impose?

hi everybody,

I have some fundamental doubt about the excat role of boundary pressure. My first question is should i use the boundary pressure i have obtained by p' equation in momentum equation. The boundary pressure is obtained by interpolating from interior nodes. What i have observed that such interpolation leads to spurious source of mass. There also seems to be some sensitivity to grid spacing of first two nodes from the boundary. I have tried using cubic interpolation for boundary pressure, but it does'nt help. Shah and London have proposed a correlation of extracting boundary pressure, but that's for some special cases. I am using non-staggered grid. My main question is what is the excat role of boundary pressure and how effectively can i use it. thnx abhijit tilak

hi jim.

i am solving usual driven cavity flow with three impenetrable walls and one moving. the flow is ofcourse incompressible.and the grid is non-uniform.so boundary condition is u=0 and v=0 at the walls.