Effect of medium-intensity free-stream vorticity on a compressible boundary layer

Abstract eng:
The nonlinear response of a compressible boundary layer to unsteady free-stream vortical fluctuations is investigated theoretically and numerically. The amplitude of the disturbances is strong enough for nonlinear interactions to arise within the boundary layer. Compressibility is taken into account through aerodynamic heating effects due to the free-stream Mach number being O(1) and through heat transfer at the wall. The free-stream flow is studied by including the boundary-layer displacement effect and is found to assume different forms depending on the regime being subsonic or supersonic. Even in a low-disturbance environment such as flight conditions, nonlinearity is found to play a significant stabilizing role on the velocity and temperature streaks, the latter being more markedly attenuated than the former at supersonic speeds. The effect of different parameters, which are relevant to the study of the nonlinear compressible streaks, is also investigated.

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