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Pré-Publication, Document De Travail Année : 2012

From linear stability analysis to three-dimensional organisation in an incompressible open cavity flow

Résumé

Three-dimensional direct numerical simulations of an incompressible open square avity flow are conducted. Features of the permanent (non-linear) regime together with the linear stability analysis of a two-dimensional steady base flow are discussed. Spanwise boundary conditions are periodic and control parameters set such that the shear layer is stable against Kelvin-Helmholtz modes. Three branches of destabilising modes are found. The most destabilising branch is associated with steady modes, over a finite range of spanwise wavenumbers. The two other branches provide unsteady modes. Features of each branches are recovered in the permanent regime: wavelength of the most powerful spanwise Fourier mode, swaying phenomenon, angular frequencies, indicating that modes of each branches are selected and interact in the permanent flow.
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Dates et versions

hal-00712297 , version 1 (27-06-2012)

Identifiants

  • HAL Id : hal-00712297 , version 1

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Luc Pastur, Yann Fraigneau, François Lusseyran, Jérémy Basley. From linear stability analysis to three-dimensional organisation in an incompressible open cavity flow. 2012. ⟨hal-00712297⟩
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