G304 間欠度輸送方程式を用いた境界層バイパス遷移の予測法に関する研究(2)(GS3 可視化,境界層,一般セッション)

概要

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This paper presents a new RANS based model for bypass transition using an intermittency transport equation. The intermittency transport equation proposed in this study is the modification of Cho and Chung model with respect to the base equation, diffusion term and empirical model constants. The intermittent behavior of the transitional flow is incorporated into the computation by modifying the eddy viscosity μ_1, obtained from a turbulence model. Wilcox low Reynolds κ-ω turbulence model is employed to calculate the eddy viscosity and others turbulent quantities. This model is designated for the prediction of flow transition under the influence of freestream turbulence and pressure gradient. For validation, the current transition model is applied to the benchmark experiments of flat plate test cases of ERCOFTAC series and to predictions of a modern low pressure turbine experiment. All test cases show well agreements with the experiments and thus it implies, the new approach has a potential as a predictive tool.
2007-11-17