【作者】 陈瑜； 谢锡麟； 麻伟巍；

【Author】 CHEN Yu,Xie Xi-lin,MA Wei-wei Department of Mechanics of Engineering Science,Fudan University,Shanghai,200433,

【机构】 复旦大学 力学与工程科学系； 东华大学 理学院；

【摘要】 本文基于映照观点,通过构造适当的曲线坐标系将物理空间中不规则的流动区域微分同胚至参数区域中的规则区域,且基于一般曲线坐标系下场论分析获得基于一般曲线坐标系的二维不可压缩流动的涡-流函数解法,以数值方法研究低Reynolds数工况,规则圆柱、水平及垂直放置椭圆柱以及表面驻波状圆柱尾迹的空间动力学行为。比较了流场总体形态、升阻力系数的时间历程等,对比研究了上述类圆柱尾迹的局部动力学行为,包括壁面涡量、壁面涡量通量等,籍此研究壁面几何特征对流场空间动力学行为的影响。更多还原

【Abstract】 The point of view of mapping which can map the real configurations of continuous medium in the physical space to the regular geometric domains in the parametric space in the diffeo-morphism manner were adopted in the present study.Consequently,the vorticity & stream-function algorithm for planar incompressible flows corresponding to the curvilinear coordinates with respect to the current physical configurations can be developed.Based on the present theory,the numerical study to several two dimensional incompressible flows were carried out.And the global features of the wakes together with local spatial dynamics behaviors of 2d cylinder wake such as boundary vorticity distribution,boundary vorticity flux and drag and lift signal were studied correspondly by comparison.The related results reveal that the characters of the flows especially the local spatial dynamics behavior could be changed due to the geometrical shape of the boundaries.更多还原