IGTC-111 An Improved Low Re Number k-ε Model to Predict Laminar-Turbutent Transition(Organized Session I ADVANCED COMPUTATIONAL SIMULATION AND DESIGN)

概要

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Several well-known low-Reynolds-Number versions of the k-ε models are analyzed critically for laminar to turbulent transitional flows as well as near-wall turbulent flows from a theoretical and numerical standpoint. After examining apparent problems associated with the modeling of low-Reynolds-number wall damping functions used in these models, an improved version of the k-ε model is proposed by defining the wall damping factors as a function of some quantity (Turbulence Reynolds number Ret) that is only a rather general indicator of the degree of turbulent activity at any location in the flow rather than a specific function of the location itself, and by considering the wall limiting behavior, the free-stram asymptotic behavior, and the balance between production and destruction of turbulence. This new model is model is applied to the prediction of (1) transitional boundary layers influenced by the free-stream turbulence, pressure gradient, and heat transfer, (2) external heat transfer distribution on the gas turbine rotor and stator blade under different inlet Reynolds number and free-stream turbulence conditions. It is demonstrated that the present model yields improved predictions.
公益社団法人日本ガスタービン学会の論文