【摘要】 该文采用k-ε双方程模型模拟流场,选用VOF模型模拟自由面,依据物理实验条件对交汇式河流进行了三维数值模拟,成功模拟出了分离区的出现、分离区的几何尺度、交汇区域的水位变化等现象。数值模拟结果与应用声速多普勒流速仪(ADV)测量的试验结果吻合较好。研究表明:在汇口下游主流右侧出现分离区,分离区流速较小甚至出现回流现象,分离区的形状随着入汇角的减小而变得狭长,分离区的尺寸随着入汇角度和汇流比的增大而增大。本模型不仅对排污口的设计、河道治理等具有重要指导作用,还可进一步用于研究交汇区域的污染物扩散。更多还原

【Abstract】 The characteristics of separation zone and flow field of confluent rivers were studied in the paper by series of numerical simulations and flume experiments. The k ～ε turbulence model and VOF method were used in simulations. The simulations were conducted in a combined flume with 90o and 60o angles between main and tributary flume and different discharge ratios. The results were examined by experiment, in which velocity field were measured by a three-component Acoustic Doppler velocimeter (ADV). The results showed that the separation zone scales varied with the discharge ratios and angles between a main river and tributary. It would play an important guiding role on the design of sewage outfall and river training, and could be applied in the study of pollutants transportation更多还原