Development of Prediction Method of Boundary Layer Bypass Transition using Intermittency Transport Equation

Abstract

This paper presents a new RANS-based method for predicting bypass transition of the boundary layer using intermittency transport equation. The base program is based on the boundary-layer analysis code given by Schmidt and Patankar (1988), implemented with Myong-Kasagi κ- ε turbulence model. The intermittency transport equation proposed in this study is the modification of Cho and Chung model (1992) with respect to the diffusion term and empirical model constants. The intermittent behavior of the transitional flow is invoked in the computation when the momentum-thickness based Reynolds number exceed a criterion given by the empirical correlation of Abu-Ghannam and Shaw (1980). The method proposed in this study is applied to the prediction of boundary layer transition under the influence of free stream turbulence and pressure gradient. Through the comparison of the calculated results with the corresponding experimental data, for example ERCOFTAC T3A, the proposed method is proven to have a potential as a predictive tool of FST (free stream turbulence intensity)-induced boundary layer transition.