Boundary Layer created by Euler Solvers

Jim

Hi, I have a simple question: Can you completely eliminate boundary layers created by Euler solvers? (of course, on a grid of a reasonable size. not h->0)

I computed a low-speed subsonic flow over a small bump on a structured nearly uniform quadrilateral grid by a 2nd order MUSCL-type finite-volume Euler solver with Roe's flux formula, with pressure extrapolation on the solid boundary (flux=[0,p*n,0] on the wall). In the solution, I see a boundary layer behind the bump, i.e. the x-velocity decreases towards the bottom wall (not goes to zero, though); all other variables look symmetric wrt the bump.

Well, is it a nature of Euler solvers? I want to know whether this is just a limitation or a bug.

Thanks, Jim