Bifurcation stationnaire tridimensionnelle dans des écoulements décollés
Résumé
Global stability analyses of several separated flow configurations have revealed that the flow bifurcates from a 2D to a 3D steady flow. To further explore the nature of the bifurcation, a weakly nonlinear analysis is performed. The amplitude of the 3D global mode is governed by a real Stuart-Landau equation. Its coefficients have been computed for a backward facing step and a smooth backward ramp. We show that the bifurcation is super-critical in the former case and sub-critical in the latter which is further investigated using a 3D global stability analysis.
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