Outlet boundary conditions

werder85 · February 26, 2011, 20:28

Hi!

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!

francisco.angel · November 28, 2017, 15:38

If you are solving an incompressible case the specific value that you use is not important, because the navier stokes equations are influenced only by the gradients in pressure.

February 26, 2011, 20:28	Outlet boundary conditions	#1
werder85 New Member Join Date: Dec 2010 Posts: 14 Rep Power: 15	Hi! 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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November 28, 2017, 15:38		#2
francisco.angel New Member Francisco Angel Join Date: Dec 2012 Posts: 26 Rep Power: 13	If you are solving an incompressible case the specific value that you use is not important, because the navier stokes equations are influenced only by the gradients in pressure.