圆柱振荡绕流中涡旋运动模式(pattern)的数值模拟  

NUMERICAL SIMULATIONS OF VORTEX MOTION PATTERNS IN OSCILLATING FLOW AROUND A CIRCULAR CYLINDER

作　　者：凌国平[1] 凌国灿[2] 

机构地区：[1]苏州大学数学系,苏州215006 [2]LNM,中国科学院力学所北京100080

出　　处：《计算物理》1996年第1期73-78,共6页Chinese Journal of Computational Physics

基　　金：国家自然科学基金;中科院力学所非线性连续介质力学开放实验室资助课题

摘　　要：提出并发展的一种基于区域分解思想,综合了解 N—S方程的有限差分法及涡法各自优点的新数值方法,计算了各种 Keulegan-Carpenter 数下(Kc=2～24)振荡流绕圆柱的流动。系统地研究了振荡流中涡旋运动模式随 Kc 数变化的规律,模拟了不对称区、单对涡区(或模向区)、双对涡区(或对角区)和三对涡区四种不同的涡旋运动模式。将计算所得的阻力系数 C_D、惯性系数 C_M与国外近期发表的计算结果进行了比较。A new hybrid finite difference and vortex method,which is based on domain decom- position and proposed by the authors,is used for calculating the oscillating flow around a circular cylinder at various Keulegan-Carpenter numbers(K_c=2～24)respectively.The rules of variation of vortex motion patterns with K_c numbers are studied systematically.The vortex motion pat- terns in asymmetric regime,single pair(ortransverse) regime,double pair(or diagonal)regime and three pairs regime are first successfully simulated in China.The calculated drag and inertial coefficients are in better agreement with experiments than other recent numerical results.

关 键 词：振荡流 分离流动 涡旋运动模式 有限差分 

分 类 号：O357[理学—流体力学]