Analysis of Low-Frequency Unsteadiness in Shockwave and Turbulent Boundary Layer Interaction

The direct numerical simulation (DNS) of a compression-ramp shockwave and turbulent boundary layer interaction is presented. The simulation covers significantly more periods of the characteristic low-frequency shock motion than a previous simulation, which has been validated against experiments.\footnote{Wu, M. \& Martin, M. P., AIAAJ, vol.45, pp. 879-889, 2007}$^,$\footnote{Wu, M. \& Martin, M. P., JFM, vol.594, pp. 71-83, 2008} We perform a spectral analysis of the flowfield, investigate the behavior of the separation bubble and possible physical mechanisms driving the low-frequency unsteadiness.