High frequency analysis of the unsteady Interactive Boundary Layer model

Abstract : The present paper is about a famous extension of the Prandtl equation, the so-called Interactive Boundary Layer model (IBL). This model has been used intensively in the numerics of steady boundary layer flows, and compares favorably to the Prandtl one, especially past separation. We consider here the unsteady version of the IBL, and study its linear well-posedness, namely the linear stability of shear flow solutions to high frequency perturbations. We show that the IBL model exhibits strong unrealistic instabilities, that are in particular distinct from the Tollmien-Schlichting waves. We also exhibit similar instabilities for a Prescribed Displacement Thickness model (PDT), which is one of the building blocks of numerical implementations of the IBL model.
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SIAM Journal on Mathematical Analysis, Society for Industrial and Applied Mathematics, In press, 50 (4), pp.4203-4245. 〈10.1137/17M1157477〉
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https://hal.archives-ouvertes.fr/hal-01615251
Contributeur : Anne-Laure Dalibard <>
Soumis le : mardi 9 janvier 2018 - 11:57:00
Dernière modification le : vendredi 4 janvier 2019 - 17:33:34

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Anne-Laure Dalibard, Helge Dietert, David Gérard-Varet, Frédéric Marbach. High frequency analysis of the unsteady Interactive Boundary Layer model. SIAM Journal on Mathematical Analysis, Society for Industrial and Applied Mathematics, In press, 50 (4), pp.4203-4245. 〈10.1137/17M1157477〉. 〈hal-01615251v2〉

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