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Old   October 29, 2007, 08:54
Default pressure boundary condition
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kharati
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What would be pressure boundary condition on airfoil surface that oscillates in inviscid and viscous fluid flow? please send me a paper regarding this subject.
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Old   October 29, 2007, 11:42
Default Re: pressure boundary condition
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Harish
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That would depend on what kind of solver you are using and what velocity components that you use.A neumann boundary condition of dp/dn=0 or extrapolation seems to work.But it again depends on the details of your solver.
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Old   October 29, 2007, 19:53
Default Re: pressure boundary condition
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zonexo
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Hi, I've been using dp/dn=0 in oscillating airfoil. However, some other ppl had used dp/dn=-(Du/Dt).n, where Du/dt is the material derivative and n is the normal. Is this a more accurate BC?

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Old   October 29, 2007, 19:59
Default Re: pressure boundary condition
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ag
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Yes, the pressure gradient should be balanced by the normal acceleration. That's what the normal momentum equation can be approximated by at the boundary.
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Old   November 3, 2007, 10:42
Default Re: pressure boundary condition
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kharati
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How can we calculate Du/Dt on an oscillating airfoil surface?
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