pressure boundary condition for inviscid flow
I think in applying boundary condition for pressure on the surface of an oscillating airfoil in an inviscid flow Du/Dt for fluid particle can not be calculated by differentiating u(t)(u(t) is airfoil motion) because of slip condition on airfoil surface.

Re: pressure boundary condition for inviscid flow
You have to apply the tangent flow boundary condition along with the boundary condition on the pressure ( dp/dn=rho*du/dt dot n ) where u is the structural velocity vector and n is the normal vector.

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