Travelling-wave solutions bifurcating from relative periodic orbits in plane Poiseuille flow - 20/03/16
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Abstract |
Travelling-wave solutions are shown to bifurcate from relative periodic orbits in plane Poiseuille flow at in a saddle-node infinite-period bifurcation. These solutions consist in self-sustaining sinuous quasi-streamwise streaks and quasi-streamwise vortices located in the bulk of the flow. The lower branch travelling-wave solutions evolve into spanwise localized states when the spanwise size of the domain in which they are computed is increased. On the contrary, the upper branch of travelling-wave solutions develops multiple streaks when is increased. Upper-branch travelling-wave solutions can be continued into coherent solutions to the filtered equations used in large-eddy simulations where they represent turbulent coherent large-scale motions.
Le texte complet de cet article est disponible en PDF.Keywords : Fluid dynamics, Hydrodynamic stability, Transition to turbulence
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