摘要
对于单圆柱绕流问题,以前的分块耦合法一般将整个流场区域划分为八个子区域,同时每一子块的内部拟边界与相邻块重叠一层网格,且节点数一致,以便实现数据传递.这种分块方法紧贴圆柱面上也会有拟边界点,所以不利于以后的动网格计算.使用新的分块耦合求解方法来数值模拟单圆柱以及不同间距下的串列双圆柱绕流情况,克服了过去分块方法造成的边界附近的数值奇性问题.并将该方法扩展用于串列双圆柱绕流的数值模拟,研究分析了改变双圆柱中心间距对上下游圆柱的升阻力系数和脉动频率所产生的影响,为进一步研究涡致振动提供了依据.使用壁面涡量积分法计算升阻力系列化脉动,精确计算出了脉动周期和幅值,计算结果与实验数据符合较好.
Presents a method for solving the incompressible N- S equation in tensor forms, which overcome the flaw of numerical singularity in the old method. A new domain decomposition method was employed to simulate the unsteady viscous flow past a single circular cylinder and two circular cylinders in tandem arrangements. The old program was reconstructed and added to our new momentum solver module. The results showed that the qualitative aspect of the flow depended strongly on the distance between the cylinders, and yielded some knowledge on vortex- induced vibration. The integral of the vortex on the wall was used to compute the lift and drag coefficient.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2003年第5期596-601,共6页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(19972061)
关键词
黏性非定常圆柱绕流
升阻力
分块耦合法
涡脱落
临界间距
数值模拟
flow over circular cylinder
tandem arrangement
vortex shedding
lift and drag coefficient
critical distance
