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针对结构涡激振动问题,分别采用雷诺平均SST k-ω湍流模型和大涡模拟(Large Eddy Simulation,LES)求解不可压缩黏性流体N-S方程,将Newmark-β法嵌入并行Fluent UDFs中以求解结构振动响应,结合滑移网格和动网格技术建立了结构涡激振动数值模拟方法。对矩形断面柱体进行不同折算风速下的竖向涡激振动响应计算,将计算结果与风洞试验结果比较,对矩形断面柱体涡激振动机理进行探讨。结果表明:矩形断面柱体竖向涡激振动响应数值模拟结果与风洞试验结果总体吻合较好,三维大涡模拟结果优于二维数值模拟结果;一个振动周期内涡激力所做功随折算风速的变化与无量纲振幅随折算风速的变化相似;矩形断面涡激力与位移时程相位差随锁定区折算风速变化而变化,在锁定区起始点相位差为0,振幅最大处相位差约为45°,锁定区结束点处相位差约为180°。
In order to solve the problem of vortex-induced vibration, the nonlinear equations of incompressible viscous fluid were solved by Reynolds-averaged SST k-ω turbulence model and Large Eddy Simulation (LES) respectively. The Newmark-β method was embedded in parallel Fluent UDFs to solve the structure Vibration response, combined with slip grid and moving grid technology to establish the structure of the vortex-induced vibration numerical simulation method. The vertical vortex-induced vibration response of rectangular section cylinder subjected to different conversion wind speed is calculated. The calculation results are compared with the wind tunnel test results to discuss the vortex-induced vibration mechanism of rectangular section cylinder. The results show that the results of vertical vortex-induced vibration response of rectangular section cylinder are in good agreement with the results of wind tunnel test, and the results of 3D large eddy simulation are better than the results of two-dimensional numerical simulation. The work of vortex-induced vibration The change of the wind speed and the dimensionless amplitude are similar to the change of the wind speed. The phase difference between the displacement of the rectangular section and the wind speed changes with the change of the wind speed in the lock zone. The phase difference at the starting point of the lock zone is 0 and the phase difference at the maximum amplitude About 45 °, and the phase difference at the end of the lock region is about 180 °.