The results of an experimental and numerical investigation of a three-dimensional laminar separated flow in a compression corner are presented. The freestream Mach number M∞ =6. The model under study is a plate with a sharp leading edge on which a step with a 30° inclination angle is mounted. The model width is equal to the plate length from the leading edge to the step. A thin high-pressure layer located above the boundary layer, downstream of the reattachment line is shown to exist
