Transient Growth on the Homogenous Mixing Layer

Abstract : We compute the three-dimensional (3D) optimal perturbations of an homogeneous mixing layer. We consider as a base state both the hyperbolic tangent (tanh) velocity profile and the developing two-dimensional (2D) Kelvin-Helmholtz (KH) billow. For short enough times, the most amplified perturbations on the tanh profile are 3D and result from a combination between the lift-up and Orr mechanisms[1]. For developing KH billows, there are different mechanisms that prevail depending on the initial amplitude of the billow, the spanwise wavenumber and the time of the response observed. We determine when the largest transient growth at a particular time is associated with an optimal response reminiscent of the elliptic or hyperbolic instability.
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Communication dans un congrès
Philipp Schlatter, Dan S. Henningson. Seventh Iutam Symposium On Laminar-turbulent Transition, Jun 2009, Stockholm, Sweden. Springer, 18, pp.453-456, 2010, IUTAM Bookseries. 〈10.1007/978-90-481-3723-7_73〉
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Soumis le : jeudi 31 juillet 2014 - 16:43:18
Dernière modification le : jeudi 10 mai 2018 - 02:03:06

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Cristobal Arratia, Sara Iams, Jean-Marc Chomaz, Colm-Cille P. Caulfield. Transient Growth on the Homogenous Mixing Layer. Philipp Schlatter, Dan S. Henningson. Seventh Iutam Symposium On Laminar-turbulent Transition, Jun 2009, Stockholm, Sweden. Springer, 18, pp.453-456, 2010, IUTAM Bookseries. 〈10.1007/978-90-481-3723-7_73〉. 〈hal-01053641〉

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