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Modeling separated flow transition with a transport intermittency model

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1720
4 pages

L. Wang
Institute of Fluid Mechanics and Engineering Acoustics, Berlin University of Technology, Müler-Breslau-Str. 8, 10623 Berlin, Germany

Song Fu
Department of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China

A. Carnarius
Institute of Fluid Mechanics and Engineering Acoustics, Berlin University of Technology, Müler-Breslau-Str. 8, 10623 Berlin, Germany

C. Mockett
Institute of Fluid Mechanics and Engineering Acoustics, Berlin University of Technology, Müler-Breslau-Str. 8, 10623 Berlin, Germany

Frank Thiele
Hermann-Fottinger-Institute for Fluid Mechanics, Technical University of Berlin, 10623 Berlin, Germany

Abstract

In this study we propose a local-variable-based laminar-turbulence transition model that considers the effects of different instability modes existing in separated flows. This model is based on k-ω-γ three-equation eddy-viscosity concept with k representing the fluctuating kinetic energy, ω the specific dissipation rate and the intermittency factor γ. It takes into account not only the local effects that the freestream disturbances penetrate into the laminar boundary layer by convection and viscous diffusion, as described by the transport equations, but also the non-local effect that by pressure diffusion, as represented by an elliptic approach. Such attempt makes the present model responding to freestream turbulence intensity properly and predicting both the long and short bubble length well, which indicates that the mixed-mode transition scenario do benefit from such a modular prediction approach that mirrors the conceptual understanding of the transition process.

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