Wavelet Multi-Resolution Analysis on Large-Eddy Simulation of Turburlent Flow behind a Vehicle Exernal Mirror
Wavelet Multi-Resolution Analysis on Large-Eddy Simulation of Turburlent Flow behind a Vehicle Exernal Mirror
复制标题
DOI：
10.1142/s0219691313600072
复制
发表时间：
2013-07
期刊：
影响因子：
--
通讯作者：
A. Rinoshika;Y. Zheng;E. Shishido
中科院分区：
文献类型：
--
作者：
A. Rinoshika;Y. Zheng;E. Shishido
应用三维正交小波多分辨分析技术，研究了不同尺度下汽车外后视镜周围的流场结构。首先，采用大涡模拟（LES）方法对雷诺数为105时镜面尾迹的三维流动进行了数值分析。然后利用小波多分辨率技术将瞬时速度和涡度分解为大尺度、中尺度和相对小尺度分量。结果表明，一个三维大尺度垂直涡主导了镜像尾流，并对涡量集中作出了主要贡献。从LES中提取了一些中等和相对较小尺度的涡，并且可以清楚地识别。
The three-dimensional orthogonal wavelet multi-resolution technique was applied to analyze flow structures of various scales around an externally mounted vehicle mirror. Firstly, the three-dimensional flow of mirror wake was numerically analyzed at a Reynolds number of 105 by using the large-eddy simulation (LES). Then the instantaneous velocity and vorticity were decomposed into the large-, intermediate- and relatively small-scale components by the wavelet multi-resolution technique. It was found that a three-dimensional large-scale vertical vortex dominates the mirror wake flow and makes a main contribution to vorticity concentration. Some intermediate- and relatively small-scale vortices were extracted from the LES and were clearly identifiable.