紊流深度平均二方程新模式及其在天然河道数值模拟中的应用  

A New Depth-Averaged Two-Equation (■-■) Turbulent Closure Model and Its Application to Numerical Simulation for a River

作　　者：余利仁[1] 

机构地区：[1]上海电力学院

出　　处：《水动力学研究与进展（A辑）》1990年第1期108-117,共10页Chinese Journal of Hydrodynamics

摘　　要：本文提出了一个深度平均二方程新模式(—),用来封闭可以考虑水深变化的深度平均控制方程组。在平面受限温差射流的九种不同工况下,与深度平均 — 模式进行了客观而详细地数值比较研究。同时,将新模式应用于天然河流一岸有三个排放口,水下地形变化的岸边排放复杂工程实例计算,在计算过程中,进一步与 — 模式以及目前工程上常用的简单方法进行了分析和比较,证实本文提出的新模式,用于通常排放流量相对较小情况的近区和过渡区模拟时,要优于经典的 — 模式和其它工程上常用的简单方法。Tie paper mainly focuses on describing the modification made to a new depth-averaged two-equation (k-ω) turbulent closure model based on the revised k- w model recently. In the case of side discharged jets with temperature difference and transverse current, the new model has been investigated numerically in detail. As a practical example of application to use the new model, the side discharge of the cooling water from three outlets into a natural river on one bank has been simulated, and the geomorphic variation under water has been treated suitably. Two depth-averaged models, k-ω and k-ε have been used, the later is the unique one at present. Emphasis is placed on the comparative research with different models under the same computational conditions. It has been verified that if the discharged flowrates are relatively small, the agreement with experimental and field data simulated by the k- w model is better than by the k- eeeeeeeeeeeeeeeeeee model or other method used commonly in engineering, when the pollutant plume in the near and transitional zones was predicted.

关 键 词：数值模拟 紊流模式 深度平均数学模型 排放 天然河道 

分 类 号：TV131.21[水利工程—水力学及河流动力学]