Article
Separation for the stationary Prandtl equation
Publications Mathématiques de l'IHÉS, Tome 130 (2019), pp. 187-297

In this paper, we prove that separation occurs for the stationary Prandtl equation, in the case of adverse pressure gradient, for a large class of boundary data at x=0. We justify the Goldstein singularity: more precisely, we prove that under suitable assumptions on the boundary data at x=0, there exists x * >0 such that y u |y=0 (x)Cx * -x as xx * for some positive constant C, where u is the solution of the stationary Prandtl equation in the domain {0<x<x * ,y>0}. Our proof relies on three main ingredients: the computation of a “stable” approximate solution, using modulation theory arguments; a new formulation of the Prandtl equation, for which we derive energy estimates, relying heavily on the structure of the equation; and maximum principle and comparison principle techniques to handle some of the nonlinear terms.

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     author = {Dalibard, Anne-Laure and Masmoudi, Nader},
     title = {Separation for the stationary {Prandtl} equation},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {187--297},
     year = {2019},
     publisher = {Springer Berlin Heidelberg},
     address = {Berlin/Heidelberg},
     volume = {130},
     doi = {10.1007/s10240-019-00110-z},
     mrnumber = {4028516},
     language = {en},
     url = {https://www.numdam.org/articles/10.1007/s10240-019-00110-z/}
}
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Dalibard, Anne-Laure; Masmoudi, Nader. Separation for the stationary Prandtl equation. Publications Mathématiques de l'IHÉS, Tome 130 (2019), pp. 187-297. doi: 10.1007/s10240-019-00110-z

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