改良型k-ε乱流モデルを使用した遷移境界層の数値解析 : (1)改良型k-ε乱流モデルの提案

概要

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Calculations of transitional flat plate boundary layer without pressure gradient have been carried out by various well known versions of low Reynolds number k-ε model and after examining apparent problens associated with the modeling of low Reynolds functions used in these models, an improved version of k-ε model is proposed by defining the damping factor fμ as a function of some quantity (turbulence Reynolds number Rt) which is only a rather general indicator of the degree of turbulent activity at any x or y location in the flow rather than a specific function of location itself, and also by taking into account the wall limiting behavior and the free-stream asymptotic behavior. Finally, the present model along with the other considered models are used to predict the experimental flat plate transitional boundary layer data for 3% and 6% free-stream turbulence intensity and the present model reproduced the experimental effect of free-stream turbulence on transition the best.
社団法人日本ガスタービン学会の論文
1992-06-10