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A laminar kinetic energy model based on the Klebanoff-mode dynamics to predict bypass transition

Abstract : This article will introduce a new bypass-transition model based on the Klebanoff-mode dynamics. The model is built on the Laminar Kinetic Energy (LKE) concept, in order to be used in a Reynolds-Averaged Navier–Stokes (RANS) formulation. A new formulation of the LKE will be presented—it is based on a transport equation which quantifies the Klebanoff-mode amplification and destabilisation. This equation is included in a k − ω turbulence model –as Walters & Cokljat (2008) suggested –and is to result in a three-equation kL − kT − ω formulation. This new model was designed according to bypass-transition descriptions available in the literature. These descriptions are based on experimental results, Direct Numerical Simulation (DNS) results and stability computations. The bypass-transition phenomenon will first be overviewed and the mechanisms of the growth and the destabilisation of the Klebanoff modes will be examined. Starting from this literature review, a new model will then be described and validated on academic configurations.
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Submitted on : Friday, October 15, 2021 - 3:55:22 PM
Last modification on : Thursday, December 9, 2021 - 4:26:42 PM
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Loic Jecker, Olivier Vermeersch, Hugues Deniau, E. Croner, G. Casalis. A laminar kinetic energy model based on the Klebanoff-mode dynamics to predict bypass transition. European Journal of Mechanics - B/Fluids, Elsevier, 2018, pp.1-15. ⟨10.1016/j.euromechflu.2018.08.016⟩. ⟨hal-01980005⟩



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