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Pipe Flow Boundary conditions

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Old   September 4, 2001, 20:52
Default Pipe Flow Boundary conditions
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Kunal Jain
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Hi I am trying to solve for a flow through a square duct for an incompressible flow in 2d. Now one of the boundary conditions becomes the inlet velocity. The other boundary condition if I set the pressure at the outlet how do I obtain the velocity in x and y direction. Do I set the gradients of both these as zero. Also if I explicitly specify the pressure would I be needing a reference pressure Thanks Kunal
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