用一种改进的κ—ε模型预测复杂湍流

An Investigation into a k-s Model by Predicting Complex Turbulent Flows

Nagano和Hishida提出了一个改进的k—ε模型以计算壁湍流,并在简单流动的计算中得到验证。本文应用这一模型对突缩管内湍流、受限同轴射流和绕障碍物的二维渠道流进行了数值预测。结果表明,引进流线曲率修正,该模型可以正确预测二维复杂流动的时均流速。

A further investigation into an improved κ-ε model of turbulence proposed by Nagano Y and Hishida M for predicting wall turbulence is obtained by predicting three complex turbulent flows: turbulent flows in a pipe with an abrupt contraction, confined coaxial turbulent jets and turbulent channel flows over a two-dimensional fence. Detailed profiles of mean velocities and turbulence energy have been computed with a finite-difference-based numerical prediction procedure and compared with experimental results. The effects of streamline curvature are considered in the prediction. The results of the three tests show that the present k-s model may predict mean velocities of two-dimensional complex turbulent flows well.