shock reflection

Shuo

I running the shock reflection test case for my compressible flow solver. I have applied the required B.C.

(Uniform Ma = 2.9 flow at LHS, top boundary specify the conditions behind a shock that would turn the flow 11 deg, Flow tangency at the wall and all variables are extrapolated at the RHS, Uniform condition specified everywhere except top boundary for initial condition)

but the shock simply hits the wall and doesn't reflect. Any advice?

thanks SHuo