Investigation of Turbulent Flow over Dunes
Investigation of Turbulent Flow over Dunes
复制标题
沙丘上空湍流的研究
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
H. Shen
中科院分区：
文献类型：
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作者：
C. Mendoza;H. Shen
沙丘上方的湍流流场通过描述湍流动能（k）及其耗散率（e）的传输方程以及从二阶矩湍流闭合（代数应力模型）导出的代数关系进行预测。通过基于有限差分解的计算机代码，结合识别的边界条件，求解得到的表达式集，该代码使用PISO算法处理连续性方程和动量方程之间的耦合，以获得流场中的平均速度和湍流应力分布、湍流动能以及沙丘表面的压力和剪应力分布。流动阻力的估计是通过整合作用在沙丘表面上的压力和剪切应力分布来获得的。预测与沙丘上湍流明渠流的详细实验数据以及总流阻的实验数据进行了很好的比较。
The turbulent‐flow field above dunes is predicted with equations describing the transport of the kinetic energy of turbulence (k) its rate of dissipation (e), and algebraic relations derived from a second‐moment turbulence closure (Algebraic Stress Model). The resulting set of expressions jointly with the identified boundary conditions are solved with a computer code based on a finite‐difference solution that uses the PISO algorithm to handle the coupling between the continuity and momentum equations to obtain mean velocity and turbulent‐stress profiles in the flow field, turbulent kinetic energy, and pressure and shear stress distributions over the dune surface. Estimates of flow resistance are obtained by integrating the pressure and shear stress distributions acting on the dune surface. Predictions compared well with detailed data of experiments on turbulent open‐channel flow over dunes and with experimental data of total flow resistance.