Nonlinear interaction of wave trains in a supersonic boundary layer

Nonlinear interaction of disturbances caused by a harmonic point source in supersonic boundary layer over a flat plate is considered. It is assumed that wave lengths are much less than a characteristic scale of nonlinear interaction and the averaging technique on the intermediate scales may be used. The wave trains are considered as sums of narrow wave packets. The parameters of flow and harmonic point source are chosen in accordance with the experiments carried out by Kosinov et al. [Nonlinear Instability of Nonparallel Flows (Springer, New York, 1994)].