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The incompressible limit and the initial layer of the compressible Euler equation. (English) Zbl 0618.76074
The author considers the Euler equations for isentropic compressible fluid flow in $$R^ n$$, $$n\geq 3$$, and discuss the limit of solutions as the Mach number $$\lambda$$ tends to infinity. In a previous paper, S. Klainerman and A. Majda [Commun. Pure Appl. Math. 35, 629-651 (1982; Zbl 0478.76091)] considered this same problem; in particular they proved that unique solutions exist for all large $$\lambda$$ on the time interval [0,T] independent of $$\lambda$$, and that if the initial datum is incompressible, then the solutions converge as $$\lambda \to +\infty$$ uniformly on [0,T] to a solution of the incompressible Euler equation. In the present paper the author shows that even if the initial datum is not incompressible, the limit still exists and satisfies the incompressible Euler equation. Due to the development of initial layer, the convergence is not uniform near $$t=0$$.
Reviewer: P.Secchi

MSC:
 76N15 Gas dynamics (general theory) 35Q30 Navier-Stokes equations
Zbl 0478.76091
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