Visualization of a Turbulent Jet Using Wavelets

作     者：Hui LI Department of Mechanical Engineering, Kagoshima University 1-21-40, Korimoto, Kagoshima City 890-0065, Japan 

作者机构：Department of Mechanical Engineering Kagoshima University Kagoshima City Japan 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2001年第10卷第3期

页      面：211-217页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

主　　题：digital image processing multiresolution image analysis orthogonal wavelet transform turbulent jet vortex. 

摘      要：An application of multiresolution image analysis to turbulence was investigated in this paper, in order to visualize the coherent structure and the most essential scales governing turbulence. The digital imaging photograph of jet slice was decomposed by two-dimensional discrete wavelet transform based on Daubechies, Coifman and Baylkin bases. The best choice of orthogonal wavelet basis for analyzing the image of the turbulent structures was first discussed. It is found that these orthonormal wavelet families with index N10 were inappropriate for multiresolution image analysis of turbulent flow. The multiresolution images of turbulent structures were very similar when using the wavelet basis with the higher index number, even though wavelet bases are different functions. From the image components in orthogonal wavelet spaces with different scales, the further evident of the multi-scale structures in jet can be observed, and the edges of the vortices at different resolutions or scales and the coherent structure can be easily extracted.