Convective instabilities in a laminar shock-wave/boundary-layer interaction

Linear stability analyses are performed to study the dynamics of linear convective instability mechanisms in a laminar shock-wave/boundary-layer interaction at Mach 1.7. In order account for all two-dimensional gradients elliptically, we introduce perturbations into an initial-value problem that found as solutions eigenvalue formulated moving frame reference. We demonstrate this methodology provides results independent numerical setup, speed, and type eigensolutions used initial conditions. The obtained time-integrated wave packets then Fourier-transformed recover individual-frequency amplification curves. This allows us determine dominant spanwise wavenumber frequency yielding largest shock-induced recirculation bubble. By decomposing temporal wave-packet growth rate physical energy-production processes, provide in-depth characterization interaction. For particular case studied, is achieved near-vicinity bubble apex due wall-normal (productive) streamwise (destructive) Reynolds-stress terms. also observe Reynolds heat-flux effects similar but contribute smaller extent.