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利用快速离散涡方法及流场可视化技术分析二维粘性不可压缩均匀流中并列圆柱体的旋涡脱落现象,识别作用在圆柱上的气动力及旋涡脱落频率。使用边界元方法及引入一个新颍的涡量边界条件计算表面涡量,利用系数影响矩阵技术获得无网格方法,采用自适应快速多极子算法快速计算涡元速度。数值算例再现了不同间距并列圆柱体的同步同相旋涡脱落、同步反相旋涡脱落、尾流的不对称性及间隙流的半稳定性等现象,数值结果与早期实验结果吻合得很好。
The rapid vortex shedding method and the flow field visualization technique were used to analyze the vortex shedding phenomenon of the parallel cylinder in the two-dimensional viscous incompressible flow and to identify the aerodynamic force and vortex shedding frequency acting on the cylinder. Using the boundary element method and introducing a new vorticity boundary condition to calculate the surface vorticity, a meshless method is obtained by using the coefficient influence matrix technique, and the vortex element velocity is calculated rapidly by using an adaptive fast multipole algorithm. The numerical example reproduces the phenomenon of synchronous isophase vortex shedding, synchronous reverse vortex shedding, wake asymmetry and semi-stability of clearance flow of juxtaposed cylinders with different pitches. The numerical results are in good agreement with the earlier experimental results.