Transitional Shock Wave-Boundary Layer Interactions of a Cylinder on a Flat Plate

The HORIZON group is currently funded by the Office of Naval Research to perform transitional shock wave-boundary layer interaction research. The goal of the research is to characterize the structure and dynamic behavior, and identify any scaling parameters of the interaction as a function of the boundary layer state.

Surface oil flow visualization of the mean separation structure development of a cylinder-induced shock wave-boundary layer interaction as the boundary layer evolves from laminar to turbulent.

Surface oil flow visualization of the mean separation structure, comparing a cylinder-induced shock wave-boundary layer interaction in a transitional and fully turbulent boundary layer. 

Typical cylinder-induced shock wave-boundary layer interaction with primary flow features identified.

Schlieren animation of a typical cylinder-induced shock wave-boundary layer interaction. Images were captured at 25 kHz to observe the dynamic behavior of the interaction in a transitional boundary layer.

Shown here is a Mach number contour for a turbulent shock wave-boundary layer interaction simulation using RANS. Separation is overpredicted, resulting in a higher triple point than seen in a turbulent experiment. Secondary vortex structures are relatively small compared to what is expected.