Although there is unprecedented progress of computational technique, the profound theoretical description of fluid and gas viscous flows at high Reynolds numbers remains as usual in exceptionally complicated problem. The singular character of Reynolds number presence in Navier - Stokes equations makes illusive not only the opportunity to treat flows by more simple Euler equations, but the choice as a dynamical principle the classic Prandtl equations of boundary layer theory. The latter are unacceptable for valid understanding such questions, as separation, instability, laminar-turbulent transition, trailing vortex structure (for small and large distance), buffeting (at transonic velocities), forward propagation of disturbances in boundary layers. An analysis of above mentioned phenomena resulted in the generalization of Prandtl notions and gave rise to creation the theory of boundary layer with self-induced pressure. The proposed free-interaction theory in the process of its birth and development permits to reveal a number of sufficiently interesting effects, which are not accessible for investigation by others methods.
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