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Forum: Main CFD Forum

December 21, 2011, 05:18

Replies: 30

2nd order boundary conditions for 2nd order discretization?

Views: 5,630

Posted By Ford Prefect

Yes I agree, I just wanted to illustrate that...

Yes I agree, I just wanted to illustrate that order of the boundary condition approximation is not always important. However, I did not think of the boundary as a supersonic boundary. The pressure...

Forum: Main CFD Forum

December 20, 2011, 09:07

Replies: 30

2nd order boundary conditions for 2nd order discretization?

Views: 5,630

Posted By Ford Prefect

I am just assuming zero gradient at the boundary...

I am just assuming zero gradient at the boundary for velocity and use one-sided differences for the derivative approximation.

Forum: Main CFD Forum

December 15, 2011, 04:37

Replies: 30

2nd order boundary conditions for 2nd order discretization?

Views: 5,630

Posted By Ford Prefect

I agree with previous poster. It is problem...

I agree with previous poster. It is problem dependent as well. For steady, incompressible, pipe flow the order of the outlet boundary condition should play little role.

1st order: u_b = u_b-1...

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