Modeling free-surface fluctuation effects for calculation of turbulent open-channel flows
Modeling free-surface fluctuation effects for calculation of turbulent open-channel flows
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DOI：
10.1023/a:1021136912983
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发表时间：
2003-03-01
影响因子：
2.2
通讯作者：
Yokojima, S
中科院分区：
文献类型：
--
作者：
Nakayama, A;Yokojima, S
提出了一种利用自由面涨落幅度在明渠湍流计算中引入自由面效应的新方法，并给出了自由面涨落方程的建模方法。通过引入阻尼因子来表示涡旋与起伏自由面的相互作用，它可以并入k-epsilon或k-omega类型的两方程模型中。对充分发展流动和后台阶流动的试验计算表明，与直接数值模拟结果和实验结果吻合较好。
A new method of introducing the free-surface effects in the calculation of turbulent openchannel flows using the amplitude of the free-surface fluctuation is proposed along with a modeling method of the equation for the free-surface fluctuation. It can be incorporated in two-equation models like k-epsilon or k-omega type models by introducing the damping factor to represent the interaction of the eddies with the fluctuating free-surface. Test calculations for fully developed flows and those over backward-facing step indicate good agreement with direct numerical simulation results as well as experimental results.