小Kc数振荡流中圆柱绕流流场结构的数值分析

本文综合Chorin的涡方法、网格涡方法和泊松方程快速解法的优点,采用固定离散涡的数目和位置,随时间变化调整离散涡强度的计算方法,对Kc数在1到5之间,β数在10到1665之间圆柱在振荡流动中的流场结构进行了数值模拟。并与U型振荡水槽中的流场涡结构显示照片比较,计算结果表明,数值解在稳定性和收敛性方面都是比较好的。与显示照片相比,其符合程度也是令人满意的。

NUMERICAL ANALYSIS OF FLOW STRUCTURE AROUND A CIRCULAR CYLINDER IN OSCILLATORY FLOW AT LOW Kc NUMBERS

This paper presents an improved algorithm which combines the advantages of Chorin's vortex method, Vortex-in-Cell method and rapid elliptic algorithm. In the present method, the numbers and positions of the discrete vortices are fixed on meshes, and the vor-ticities of the discrete vortices are adjusted with the time advances. Numerical simulations of flow structure around a circular cylinder in oscillatory flow, ranging in Kc from 1 to 5 and β from 10 to 1665, are presented in the paper. The comparison of ...