摘要
研究了雷诺数Re=200,1000,线速度比α=0.5,2.0,4.0,强迫振荡频率f_s=0.1～2.0情况下的旋转振荡圆柱绕流问题,通过基于非结构同位网格有限体积法对Navier-Stokes方程进行数值求解,对流项、扩散项和非恒定项的离散格式均具有二阶精度,利用SIMPLE算法处理压力一速度耦合,计算得到了作用力系数随不同控制参数的变化规律,通过对升力系数的频谱分析得到自然脱落频率和强迫振荡频率下的作用力振幅,通过对不同频率作用力幅值的分析,得到频率之间的竞争关系,进而定量地给出了不同尾迹涡脱落模式的分区图。
The unsteady flow past a circular cylinder which starts translating and rotary oscillating impulsively from rest in a viscous fluid is investigated at Reynolds numbers Re = 200 and 1000, rectilinear speed ratios α = 0.5, 2.0 and 4.0, and for forced oscillating frequencies fs between 0.1 and 2.0. Numerical solutions of the Navier-Stokes equations are obtained by a finite volume method based on unstructured colocated meshes. The discretized schemes of the convective fluxes, diffusive fluxes and unsteady term are all of second-order accuracy. The SIMPLE algorithm is adopted to deal with the pressure-velocity coupling. The varieties of force coefficients with the control parameter are obtained after the discussion. The amplitudes of lift coefficients at natural shedding frequency and forced oscillating frequency respectively are determined by the amplitude spectra analysis, which show clearly the competitive relationship between the two frequencies. Based on this relationship, the region of the classification of flow structure modes is given at last.
出处
《力学学报》
EI
CSCD
北大核心
2004年第4期466-471,共6页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(19972068)~~
