The organized vortex structure in relaxing gas flow

Data of the experiments correspond immediately to the nonlinear stage of transition in the turbulent regime at alpha = 7 It's known from the modern scenarios of the transition and generation of turbulence are flat these processes are essential nonlinear. They realize by means of origin evolution and decay of certain vortex structures. In boundary layers and pipes they are known gamma-structures, in two-dimension free shear flows and jets they are two-dimensional vortices extended on the transversal coordinate. Under this interpretation the generation of turbulence can be considered as the process of LTT which is stochastically repeated in space and time. This fact allows one to assume flat bulk viscosity influence on the development of perturbations at the nonlinear stage can be estimated by simulating the interaction of the solitary vortex structure with the basic (mean) flow. In this paper the simple model of the evolution of the spanwise vortex structure in a shear flow of non-equilibrium molecular gas is considered for such a purpose.