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A Four-Equation Eddy-Viscosity Approach for Modeling Bypass Transition

Published online by Cambridge University Press:  03 June 2015

Guoliang Xu
Affiliation:
China Aerodynamics Research and Development Center, Mianyang 621000, China School of Aerospace, Tsinghua University, Beijing 100084, China
Song Fu*
Affiliation:
School of Aerospace, Tsinghua University, Beijing 100084, China
*
*Corresponding author. Email: fs-dem@tsinghua.edu.cn
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Abstract

It is very important to predict the bypass transition in the simulation of flows through turbomachinery. This paper presents a four-equation eddy-viscosity turbulence transition model for prediction of bypass transition. It is based on the SST turbulence model and the laminar kinetic energy concept. A transport equation for the non-turbulent viscosity is proposed to predict the development of the laminar kinetic energy in the pre-transitional boundary layer flow which has been observed in experiments. The turbulence breakdown process is then captured with an intermittency transport equation in the transitional region. The performance of this new transition model is validated through the experimental cases of T3AM, T3A and T3B. Results in this paper show that the new transition model can reach good agreement in predicting bypass transition, and is compatible with modern CFD software by using local variables.

Type
Research Article
Copyright
Copyright © Global-Science Press 2014

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