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 .45是尾流区涡街向形成稳定的回流区转变的临界值 In order to investigate the characteristics of the backflow of the circular island flow in the shallow aquifer, the shallow water equations of the Reynolds average equation (equivalent to the circular flow around the deep water area) and the depth average were solved respectively. The k- ε turbulence model is used to simulate the flow around the island under several operating conditions. The calculation uses the SIMPL E algorithm to solve the equation. The calculation results show that the flow structure of the wakes in the wake of island flow in the Sham Shui Po area is mainly affected by Re. The only parameter that determines the flow pattern of the shallow wake is the stability parameter S, and S = 0.45 is the vortex wake Street to form a stable reflux area of ​​the critical value of change