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Old   March 4, 2001, 22:53
Default Unsteady boundary conditions
James Date
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I'm modelling a NACA 0020 aerofoil under unsteady flow conditions, using a finite volume flow solver. My question is, if I'm using an unsteady inflow boundary condition upstream of the foil what should the outflow boundary condition be set as. Is a constant pressure outflow boundary condition valid, if placed far enough downstream?

Regards James
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Old   March 5, 2001, 11:58
Default Re: Unsteady boundary conditions
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It depends on Mach number. If the problem is subsonic then constatnt pressure at outflow boundary will be Ok. If M> 1 then you should set smooth condition d/dn = 0.
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Old   March 5, 2001, 13:54
Default Re: Unsteady boundary conditions
clifford bradford
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Search for Kevin Thompsons paper called "Unsteady boundary Conditions for Hyperbolic systems" in J. Comp. Physics
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