pressure boundary condition
 

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.

Re: pressure boundary condition
 

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.

Re: pressure boundary condition
 

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?

Thanks

Re: pressure boundary condition
 

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.

Re: pressure boundary condition
 

How can we calculate Du/Dt on an oscillating airfoil surface?