Equations of hydrodynamic type: exact solutions, reduction of order, transformations, and nonlinear stability/unstability

Details Equations of hydrodynamic type: exact solutions, reduction of order, transformations, and nonlinear stability/unstability Equations of hydrodynamic type: exact solutions, reduction of order, transformations, and nonlinear stability/unstability

2009-09-09

arxiv.org/abs/0909.1844v1

Physics

Fluid Dynamics

10 pages

Scientific paper

Systems of hydrodynamic type equations derived from the Navier-Stokes equations and the boundary layer equations are considered. A transformation of the Crocco type reducing the equation order for the longitudinal velocity component is described. The issues of nonlinear stability of the obtained solutions are studied. It is found that a specific feature of many solutions of the Navier-Stokes equations is instability. The nonlinear instability of solutions is proved by a new exact method, which may be useful for the analysis of other nonlinear physical models and phenomena.

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