双排并列三方柱绕流数值模拟

Numerical Simulation of the Flow around Double-row Tied for Three Square Cylinders

采用有限体积法对雷诺数Re=2.2×104条件下双排并列三方柱绕流问题进行数值模拟,对横向桩距比L/D=1.5、2、2.5、3,纵向桩距比S/D=2、2.5、3共12种工况下绕流流场分别进行计算,得到了每种工况下各方柱绕流阻力系数值及其随桩间距的变化规律,同时分析了绕流流场的演变及方柱前后压差随桩间距的变化趋势,计算结果表明:多方柱绕流较单方柱已明显表现出群桩阻水效应,各方桩绕流参数变化幅度较大,流场演变相对复杂。

With the finite volume method,the flow around double-row tied for three square cylinders at Re = 2. 2 ×10^4 was simulated, and the circle flow field under 12 kinds of work conditions with the horizontal spacing ratio LID = 1.5,2,2. 5,3 and the longitudinal spacing ratio S/D = 2,2. 5,3 was calculated respectively, and the drag coefficient of flow around every square cylinder with the change of pile spacing were obtained under each work condition. Meanwhile, the trends of flow field evolution and pressure difference between pre and post square cylinders with the change pile spacing were obtained. Calculation results show that：the flow around several square cylinders clearly show pile group watertight effect than the flow around a square cylinder, and the change of flow parameters is bigger and the flow field evolution is more complex.