热科学学报（英文版）2001，Vol.10Issue(3)：211-217,7.
Visualization of a Turbulent Jet Using Wavelets
Visualization of a Turbulent Jet Using Wavelets
Hui LI1
作者信息
- 1. Department of Mechanical Engineering, Kagoshima University 1-21-40, Korimoto, Kagoshima City 890-0065,Japan
- 折叠
摘要
Abstract
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 N＜10 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.关键词
digital image processing/multiresolution image analysis/orthogonal wavelet transform/turbulent jet/vortexKey words
digital image processing/multiresolution image analysis/orthogonal wavelet transform/turbulent jet/vortex分类
能源科技引用本文复制引用
Hui LI..Visualization of a Turbulent Jet Using Wavelets[J].热科学学报（英文版）,2001,10(3):211-217,7.
