Shock Wave/Transitional Boundary Layer Interactions Generated by a Cylinder on a Flat Plate

The HORIZON group is currently funded by the Office of Naval Research to perform shock wave/transitional 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 incoming boundary layer state. This work uses a variety of diagnostic techniques in our on-campus facilities, and has led to collaborations with Texas A&M University and NASA Langley Research Center. Check out the publications page to see the data resulting from this work.

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. 

Schlieren animation of a typical cylinder-induced shock wave/transitional boundary layer interaction. Images were captured at 25 kHz.

We extract quantitative data on the shock position and dynamics using an in-house developed MATLAB script. This animation is a demonstration of how it works.

Interaction dynamics and scaling across Schlieren (top), unsteady Pressure-Sensitive Paint (middle), and surface oil flow visualization (bottom). The probability density function of the upstream influence shock and forward shock foot derived from the Schlieren images is also shown.

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.