重叠网格技术在小型油粘滞阻尼器设计中的应用研究

Overlap Grid Research on the Application of Minitype Oil Viscous Damper Design

摘要: 论文采用URANS方法和运动重叠网格计算盛液封闭容器内的薄板振动绕流问题。数值网格采用两套网格重叠布置的形式，网格运动由用户自定义函数(UDF)实现，湍流模型采用SST k-ω模型，采用有限体积法和PISO算法求解URANS方程。文中通过对带正六边形薄板的小型油粘滞阻尼器进行建模分析及求解。结果表明，这种阻尼器的耗能能力与薄板面积基本呈线性关系，与薄板振幅的平方也呈近似线性关系，一个振动周期内薄板表面压力演化过程的流场显示，有助于增进对此类流动问题的认识。计算结果还表明基于重叠网格技术的CFD数值模拟，可以较好的模拟盛液封闭容器内振动薄板的流动问题。

Abstract: Unsteady Reynolds Averaged Navier Stokes (URANS) methods and moving overlap gird tech-nique are used to calculate the internal flow around thin plate vibrating in vessel filled with vis-cous fluid. Computational grid zones are arranged overlapping each other. The gird moving is carried out by using user define function built in commercial software. The SST k-ω turbulence model, finite volume method and PISO algorithm are employed to solve URANS equations in viscous flow calculation. This paper builds numerical model for a minitype oil viscous damper with hexagon thin plat and solves the internal flow. The results show that the energy dissipation capacity of this damper is not only in linear relationship with the area of the plate but also pro-portional to the square of the vibration amplitude. The flow visualization of the pressure evolu-tion on surface of the oscillating thin plate during a period contributes to insight of flow prob-lem in this kind. Those results also manifest that the present CFD simulation with overlap gird is suitable for calculating the oscillating flow induced by thin plate in closed container filled with viscous fluid.