不同流向下低质量比方形四立柱涡激运动特性研究

Research on Vortex Induced Characteristics of Four Square Columns with Low Mass Ratio under Different Flow Approach

采用有限体积法对方形四立柱涡激运动进行了数值模拟。方形四立柱涡激运动系统简化为两自由度的质量-弹簧-阻尼模型,引入雷诺平均应力模型求解不可压缩粘性Navier-Stokes方程,结合SST k-ω湍流模型对低质量比弹性支撑的方形四立柱涡激运动进行了研究。对不同来流方向和折合速度下横向振幅、流向振幅、流向平衡位置、升力系数的主频变化趋势进行了分析,探讨了其运动轨迹和尾涡脱落模。

The finite volume method is used to simulate vortex-induced motion of four circular columns in this paper. The vortex-induced motion system of four circular columns is simplified into spring-mass-damping model Reynolds-Averaged solver combined with the SST （Shear-Stress Transport） k-co turbulence model for the Navier-Stokes equation has been used to simulate the vortex induced motion at low mass ratio. The changing trend of the stream-wise and transverse amplitude, in-line balance position, main frequency of lift coefficient at different reduced velocity and flow approaching angles is analyzed Finally, the trajectory and vortex shedding pattern of four square columns at different velocities are discussed.