抄録
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.
