moving boundary and pressure

M. Engel

Hello,

I am using curvilinear coordinates to solve the ALE-Navier-Stokes-equations on a moving grid. Grid velovities are computed according to geometric conservation. A pressure projection method is used. At inflow boundary a constant(in time) parabolic profile is used, freestream at outflow boundary and no-slip(v=0) at rigid walls. At the moving wall I set u = u_wall. Now I experience pressure oscillations(in time), apparently dependent on the acceleration of the boundary, and after long time the poisson-equation is not solvable any more. Any hints?

Thank you, Martin