浅水层与深水区圆柱岛屿的近尾流流动  

Circular island flow structures in shallow water and deep water

作　　者：李玲[1] 李玉梁[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2000年第8期117-120,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金项目!(5 96 790 2 3);中国博士后基金! (1999) 17号

摘　　要：为对浅水层中圆柱型岛屿绕流的回流特征进行探讨 ,分别求解了 Reynolds平均方程 (相当于深水区圆柱绕流 )和深度平均的浅水方程 ,并采用基于 RNG(renonnalization group)方法的 k-ε湍流模型数值模拟几种工况下岛屿绕流的流动。计算中采用 SIMPL E算法求解方程。计算结果表明 ,深水区岛屿绕流的尾流区的流动结构主要受到 Re的影响 ,而决定浅水尾流流动模式的唯一参数是稳定性参数 S,并且发现 S=0 .The recirculating shallow water flow in wakes behind circular islands was investigated numerically. The reynolds averaged equations and the depth averaged shallow water equations were solved with the k ε turbulence model based on RNG (renormalization group) to numerically simulate the wake flow. The analysis used the SIMPLE algorithm. The calculated results show that the wake stability parameter, S , is a unique factor that determines the flow patterns behind an island in shallow water. The value of S=0.45 marks the transition from vortex shedding to a recirculating bubble wake. Deep water flow in the wake of a circular cylinder was a function of the Reynolds number.

关 键 词：浅水尾 深水区 湍流尾流 数值模拟 

分 类 号：TV131.21[水利工程—水力学及河流动力学]