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werder85 February 26, 2011 21:28

Outlet boundary conditions

I'm a newbie to cfd. I'm trying to solve a backward facing step with a second order finite difference approach on a staggered grid.
I've specified the velocity inlet boundary condition (I'm using the incompressible Navier Stokes equations with artificial compressibility and they have been non-dimensionalized -> u=1.0, v=0.0 at inlet).
Which should be the outlet boundary condition? I read in different places that it should be a pressure condition. If yes which should be tha value?
Thank you!

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