A Bypass Transition Model by Convecting the Production Term in the Turbulent Kinetic Transport Equation

紊流動能方程式中對流生成能的迂迴過渡模式

陳宗輝(Tzong-Huei Chen)

《中國航空太空學會學刊》 32卷4期 (2000/12) Pp. 281-290

https://doi.org/10.6124/TAASRC.200012_32(4).02

摘要

本文提出過渡流(transition)的模式應用於一新的低雷諾數二方程紊流模式，來改善平板流過渡區的預測。此新的二方程紊流模式考慮鄰壁上的流體行爲，利用大尺度及小尺度的慨念來進行紊流漩渦黏度的模式，包括鄰壁的阻尼效果。兩種不同的阻尼效果函數提出，並與DNS數據作比較。此三方程模式對於過渡區的預測並不與實驗數據吻合。研究朝向二方程式中的紊流動能方程式內的生成能項考慮，因而提出對流生成能模式。數值模擬結果，此模式對於過渡區的開始與結束的預測相當適當。

關鍵字

紊流模式 ； 過渡流

並列摘要

A transition model applied to a new low Reynolds number two equation turbulence model that characterizes the near-wall turbulence behavior is proposed to improve the transition prediction for the flat plate flow. The newly developed two-equation model utilizes the largest and the smallest scales in constructing the turbulent eddy viscosity model, including the damping effects to match the asymptotic behavior of the flow in the vicinity of the wall. Two types of damping functions were presented and tested against the simple flows from DNS data. Transition predictions using this two-equation model at bypass free stream turbulence levels were not agreed well with experimental correlation. Focus on the production term in the turbulent kinetic energy transport equation was carried out and a convective production transition model was then proposed, Numerical results compared with the onset and end of transition experimental data were found to be appropriate.

並列關鍵字

Turbulence Model ； Transition