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Boundary condition pairs to avoid?

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Old   September 27, 2016, 05:38
Default Boundary condition pairs to avoid?
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What are some boundary condition pairings that should be avoided and why?
or if you know of a document or a suggestion of where I could figure something like this out that would be great!

For example, fixing the pressure and velocity at the inlet and outlet should be avoided as this overdefines the situation.
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