基于Fluent的多圆柱体绕流场数值模拟

 圆柱绕流一直是海洋工程研究热点，对海洋工程有重要意义。在海洋工程应用中，多圆柱间相互干扰现象普遍存在，多圆柱绕流特性一直是研究的热点和难点。为了分析多圆柱绕流场的形态结构，本文应用Fluent软件，采用数值求解RANS方程的黏性流方法，对典型的多圆柱黏性绕流场进行模拟。结果表明，串列双圆柱绕流场与圆柱间距有关；并列双圆柱尾流存在反向对称涡街；斜置双圆柱与3圆柱绕流场存在后柱抑制前柱涡的分离现象；方形排列4柱绕流场尾涡存在非对称性。同时表明Fluent软件对多圆柱体绕流场的数值模拟是有效的，本文采用的方法能定性正确地模拟多圆柱绕流的流动细节。

Simulation of Flow Around Multi-Circular-Cylinders Based on Fluent

The flow around circular cylinders always is a problem of focus in ocean engineering, as related with platforms and oil pipelines. In this paper, the Fluent software is used to simulate the flow around multi-circular-cylinders, for several typical arrangements of multi-circular- cylinders. The simulation is based on the RANS equation and RNG turbulence model. It is shown that the flow around serial arrangements of two circular cylinders is related to the distance between the two cylinders. There is a symmetric and inverted vortex in the flow around two circular cylinders of the parallel arrangement. The flow around two circular cylinders of the staggered arrangement is similar to the flow around three cylinders of triangle-shaped arrangement or inverted triangle-shaped arrangement, and the fore circular cylinders restrain the vortex separation by the back circular cylinders. The vortex in the flow around four circular cylinders of square arrangement is unsymmetrical. The simulation results indicate that the simulation of multi-circular-cylinders viscous flow field using Fluent is effective, and the details of the flow around multi-circular-cylinders can be qualitatively simulated.