摘要
采用适合于分离流的修正低雷诺数ｋ－ε模型对突扩园管中的流动进行了数值研究，重点是对近壁流动和再附着点附近流动的研究。从理论上证明了所采用的湍流模型既满足近壁渐进行为，又避免了在通过再附着点截面上μｔ恒为０的困难。和已有的实验数据比较表明，所采用的模型对再附点位置及其附近的流动预测能力优于普通低雷诺数ｋ－ε模型。
modified low Reynolds number kε turbulence model applicable to separated flow recently developed in is used for the calculation of turbulent separated flow in pipe expansion, particularly for the numerical study on turbulent flow in the regions near the wall and neighboring to the reattachment point. It is shown theoretically that this turbulence model satisfies the near wall asymptotic behavior while avoiding μt≡0 in the whole section across the reattachment point. Comparisons with available measurements and the numerical results by previously developed kε turbulence model show that the adopted model is superior to other low Reynolds number kε models on the prediction of reattachment point and the flow field neighboring to it.
出处
《应用力学学报》
CAS
CSCD
北大核心
1998年第2期91-95,共5页
Chinese Journal of Applied Mechanics
