数值分析倒角半径对半潜式平台绕流特性影响

Numerical simulation on the effect of corner radius on flow past a semi-submersible platform

半潜式平台的多柱绕流问题是研究半潜式平台涡激运动的基础,而半潜式平台多柱之间旋涡脱落的相互干扰使得立柱倒角半径的改变对于半潜式平台绕流的影响更为显著,故研究立柱倒角半径对半潜式平台绕流特性的影响对于半潜式平台的设计建造具有重要的指导意义。该文基于OpenFOAM开源代码工具箱,采用基于剪切应力运输(shear stress transport,SST)的延迟分离涡模拟(delayed detached-eddy simulation,DDES)方法,选取四种典型来流速度,对四种立柱倒角半径的半潜式平台在0°流向角时的阵列四柱绕流进行了数值模拟。并从半潜式平台立柱流体力系数、近尾流场流向速度分布及立柱尾部旋涡脱落特征等方面探究了立柱倒角半径变化对半潜式平台绕流特性的影响。

The study of the flow past a semi-submersible platform is the basis for the study of its vortex-induced motion,The interaction of vortex shedding between multi-columns of the semi-submersible platform makes the change of the corner radiuses of the columns has more significant effect on the flow past the semi-submersible platform.The study on the effect of column corner radius on flow past a semi-submersible platform has important guiding significance for the design of platform.Based on the open source CFD toolkit OpenFOAM,numerical simulation of flow past a semi-submersible platform with different column corner radiuses at 0° incident angle has been carried out in this paper using delayed detached-eddy simulation based on shear stress transport model（SST）.Four typical current velocities are chosen.The effect of the variation of the column＇s corner radiuses on the flow characteristics of the semi-submersible platform is studied based on the fluid force coefficient of the columns and platforms,mean stream-wise velocity in the near wake and the characteristics of vortex shedding.