Topology of the vorticity field in three-dimensional shear layers and wakes
Topology of the vorticity field in three-dimensional shear layers and wakes
复制标题
三维剪切层和尾流中涡度场的拓扑
DOI：
10.1016/0169-5983(88)90057-3
复制
发表时间：
1988
影响因子：
1.5
通讯作者：
W. Ashurst
中科院分区：
文献类型：
--
作者：
E. Meiburg;J. Lasheras;W. Ashurst
An experimental and numerical study of the three-dimensional transition of plane wakes and shear layers behind a flat plate is presented. Flow visualization techniques are used to monitor the response of laminar flows at moderate Reynolds numbers (≈ 100) to perturbations periodically distributed along the span. In this way, the formation and evolution of streamwise vortex tubes and their interaction with the spanwise vortices are analyzed. The flow was studied numerically by means of three-dimensional inviscid vortex dynamics. Assuming periodicity in the spanwise and the streamwise direction, we discretize the vorticity field into two layers of vortex filaments with finite core diameter. Comparison between experiment and visualization indicates that important features of the three-dimensional evolution can be reproduced by inviscid vortex dynamics. Vortex stretching in the strain field of the spanwise rollers appears to be the primary mechanism for the three-dimensional transition in this type of flows.
