方柱-弹性分隔板涡致振动数值研究

Numerical Investigation of the Vortex Induced Vibration of a Square Cylinder With Flexible Plate

本文开发了基于有限体积法的流固强耦合大变形求解器,流体采用ALE动网格技术,固体采用修正拉格朗日模型进行求解。研究100≤Re≤1000范围内,方柱-弹性分隔板的涡致振动特性及其尾流脱涡特性。结果表明:弹性分隔板阻断尾流区剪切层的相互作用,使钝体阻力减小,旋涡脱落至下游;随着雷诺数的增加,方柱和分隔板的升力系数与振幅逐渐增大;弹性分隔板的斯特努哈尔数明显较小,能够更好地抑制尾流区剪切层间的相互作用.

The large deformation and fluid structure interaction(FSI) solver based on finite volume method is developed.The Arbitrary Lagrangian Eulerian(ALE) formulation is used to solve the motion of fluid,integrated with Updated Lagrangian model to govern the motion of the flexible plate with the assumption of large structural deformation.This paper studies the vortex induced vibration and vortex shedding behavior of a flexible plate in the wake of square cylinder at low Reynolds number 100^i?e<1000.Results show that the flexible plate inhibits wake interactions between the shear layers,which decreases the drag force on the bluff body and postpones the vortex shedding to downstream.The lift coefficient of cylinder with plate and the amplitude of the plate increase with the increasing of Reynolds number.Flexible plate can significantly reduce the Strouhal number and inhibit the wake interactions between the shear layers.