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Multiple solutions for compressible turbulent flow models. (English) Zbl 1109.35073
Summary: We analyse the uniqueness of the solutions of a PDE system from the framework of compressible turbulent models. Smoothness properties of the turbulent viscosity closure law are of central importance. Several closures of practical importance, including the most widely used law, indeed fail to be Lipschitz continuous in the natural neighborhood of a null turbulent energy. For such models, we prove the existence of infinitely many distinct traveling wave solutions which exhibit positive turbulent energy but connect at infinity end states with vanishing turbulence. Examples and counter-examples are given.

MSC:
35L67 Shocks and singularities for hyperbolic equations
35Q35 PDEs in connection with fluid mechanics
76F50 Compressibility effects in turbulence
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