Generation of longitudinal structures by external vortical and thermal waves

The longitudinal structures generated by external vortical and thermal waves in subsonic and supersonic boundary layers have been studied. Particular attention is paid to setting boundary conditions on the external boundary of the boundary layer. It has been found that disturbances of the longitudinal velocities inside the boundary layer can be several times higher than the amplitude of the external vortical wave. The generation efficiency decreases with increasing Mach number. It has been shown that the influence of thermal external waves on the flow structure in the boundary layer is much weaker than the influence of the vortex structure of the flow.