Abstract
Approximate approach for the simple description of weakly nonlinear wave packet dynamics in laminar boundary layer is suggested. To this end time dependent integral nonlinear equation was obtained for the spectral amplitudes of disturbances in single-mode approximation with Gauss form of spectral distributions of every component in the state of 3-wave resonance together with a component concentrated near the origin of wave vector space. THe dynamics of the wave packet and amplitudes of its components by time is demonstrated.
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