Global stability of a jet in crossflowReport as inadecuate




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* Corresponding author 1 Linné Flow Centre, Department of Mechanics, Royal Institute of Technology KTH, SE-10044 Stockholm, Sweden 2 LadHyX - Laboratoire d-hydrodynamique

Abstract : A linear stability analysis shows that the jet in crossflow is characterized by self-sustained global oscillations for a jet-to-crossflow velocity ratio of 3. A fully three-dimensional unstable steady-state solution and its associated global eigenmodes are computed by direct numerical simulations and iterative eigenvalue routines. The steady flow, obtained by means of selective frequency damping, consists mainly of a steady counter-rotating vortex pair CVP in the far field and horseshoe-shaped vortices close to the wall. High-frequency unstable global eigenmodes associated with shear-layer instabilities on the CVP and low-frequency modes associated with shedding vortices in the wake of the jet are identified. Furthermore, different spanwise symmetries of the global modes are discussed. This work constitutes the first simulation-based global stability analysis of a fully three-dimensional base flow. © 2009 Cambridge University Press.





Author: S. Bagheri - P. Schlatter - Peter Schmid - D.S. Henningson -

Source: https://hal.archives-ouvertes.fr/



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