solver for compressible flow
 

hello all,
i am student and new at/in (?) OpenFOAM
i am just trying my first case in OpenFOAM (flow in an open cavity)
i want to solve for compressible flow. the conditions i have are

unsteady, laminar flow with
M=0.15 ; cavity L/D ratio=4 ; Re=1500

please suggest a solver and how to specify the boundary conditions.