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different boundary conditions for flat plate

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Old   March 20, 2012, 09:40
Default different boundary conditions for flat plate
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dear all,

so far I have seen three approaches for the boundary conditions of flow over a flat plate (for the top one):
1. free stream surface with velocity perpendicular to flat plate = 0
2. inflow bc on the top with positive slope of the mesh on the top
3. outflow boundary condition on the top

which is the best to choose ?
can I expect any differences in the results ?
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