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oscillating airfoil in an inviscid fluid flow

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Old   December 8, 2007, 03:15
Default oscillating airfoil in an inviscid fluid flow
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S.T
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How can we apply pressure boundary condition on airfoil surface oscillating in an inviscid fluid flow?
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Old   December 8, 2007, 06:30
Default Re: oscillating airfoil in an inviscid fluid flow
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Alex
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Why do you need a pressure boundary condition, not the standard vanishing normal velocity on the airfoil?
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Old   December 8, 2007, 07:36
Default Re: oscillating airfoil in an inviscid fluid flow
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S.T
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I want to solve unsteady Euler equations using C-type mesh. that's why I need pressure boundary condition on the airfoil surface.
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Old   December 8, 2007, 12:53
Default Re: oscillating airfoil in an inviscid fluid flow
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Peter Attar
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the pressure BC can be obtained from the expression(latex math): {\partial p \over \partial n}=-\rho \vec{a}_b \cdot \vec{n} where \vec{a}_b is the acceleration of the body and \vec{n} is a vector normal to the surface.

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Old   December 10, 2007, 02:17
Default Re: oscillating airfoil in an inviscid fluid flow
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S.T
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the equation you mentioned must be applied in the fluid and we know that fluid particles slip on the airfoil surface and for slip condition we know that acceleration of body is not equal to fluid particles !
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Old   December 10, 2007, 06:25
Default Re: oscillating airfoil in an inviscid fluid flow
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CFD Student
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http://aiac.ae.metu.edu.tr/db/serv.p...=AIAC-2007-017

this might help you...
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Old   December 10, 2007, 09:07
Default Re: oscillating airfoil in an inviscid fluid flow
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Peter Attar
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You apply this to get the pressure and then a condition on the normal velocity(ie that they are the same for the fluid and structure). Look at any papers which deal with fluid-structure interaction and the Euler equations.
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