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利用CFD方法,研究较高雷诺数下圆柱绕流及圆柱大振幅比横向受迫振动特性。在Navier-Stokes方程和k??湍流模型的基础上,对圆柱绕流分别进行了二维与三维的数值模拟,得到了圆柱绕流的升力系数和漩涡发放频率数等结果。研究结果表明,三维模拟的升力系数均小于二维模拟结果。利用Fluent的动网格技术进行大振幅比圆柱横向受迫振动的研究,得到圆柱在不同振动频率时的升力系数及漩涡发放规律和圆柱在特定振幅及频率下的“锁定”区间。
The CFD method is used to study the transverse forced vibration characteristics of circular flow and large circular cylinder under high Reynolds number. Based on the Navier-Stokes equations and the k-turbulence model, two-dimensional and three-dimensional numerical simulations of the flow around the cylinder were carried out respectively. The lift coefficient and the number of vortex shedding frequencies were obtained. The results show that the lift coefficients of three-dimensional simulation are less than the two-dimensional simulation results. Fluent dynamic grid technology is used to study the large amplitude and lateral forced vibration of cylindrical columns. The lift coefficient and vortex shedding regularity of the cylinder at different vibration frequencies and the “locking” interval of the cylinder at specific amplitude and frequency are obtained.