DNS of Turbulent By-Pass Transition at the Entrance of a Plane Channel
作者： A. Cadiou , M. Buffat , L. Le Penven , J. Montagnier
DOI: 10.1007/978-3-319-01860-7_10
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摘要: Direct numerical simulations of boundary layers transition and their interaction in a very elongated plane channel are presented.Wall-normal velocity perturbations small amplitude with spanwise wavelength the order layer thickness introduced one layer. They generate steady streaks by transient growth mechanism. In non-linear regime, varicose instability mechanism pushes low speed away from wall. Mushroom-shaped structures appear outer region laminar subjected to sinuous instabilities leading transition. The turbulent evolves further downstream initiates by-pass second An orthogonal decomposition field is used characterize
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