流体中相互靠近两圆柱的水动力特性数值研究

Numerical study of hydrodynamic characteristics between two submerged approaching cylinders

该文采用基于动态网格技术的CFD数值方法,对黏性流体中两物体相互靠近时的水动力特性进行了研究。首先对比分析了无黏流场和黏性流场中圆柱的受力特性,然后分析了不同间隙比、不同靠近速度、不同背景流场下黏性流场中圆柱的受力特性。数值模拟结果表明:当来流速度为零时,阻力系数随着间隙比的减小而增大,随靠近速度的增大而增大;当来流速度不为零时,阻力系数随着来流速度的增大而增大;当来流速度与靠近速度之比较大时,圆柱受力出现较为明显的振荡。

The hydrodynamic characteristics of the two cylinders approaching to each other in viscous flow have been studied using the computational fluid dynamics （CFD） tool based on dynamic mesh technology. The paper compares, the characteristics of dynamics in inviscid flow with that in viscid flow firstly. Then the forces acting on the cylinders in viscid flow under different interstice ratios, different approaching velocities and different background flows are analyzed. The numerical results show that when the background flow velocity is zero, the drag coefficient increases gradually with the decrease of interstice ratio, and increases with the increase of approaching velocity. When the background flow velocity is not zero, the drag coefficient increases with the increase of background flow velocity. When the ratio between the background flow velocity and the approaching velocity is large, the cylinder vibrates obviously.