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http://dx.doi.org/10.3795/KSME-B.2004.28.9.1032

Coherent Structure Extraction from 3-Dimensional Isotropic Turbulence Velocity Field Using Discrete Wavelet Transform  

Lee, Sang-Hwan (한양대학교 기계공학부)
Jung, Jae-Yoon (한양대학교 대학원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.9, 2004 , pp. 1032-1041 More about this Journal
Abstract
In this study we decompose the 3-dimensional velocity field of isotropic turbulent flow into the coherent and the incoherent structure using the discrete wavelet. It is shown that the coherent structure, 3% wavelet modes, has 98% energy and 88% enstrophy and its statistical characteristics are almost same as the original turbulence structure. And it is confirmed that the role of the coherent structure is that it produces the turbulent kinetic energy at the inertia range then transfers energy to the dissipation range. The incoherent structure, with residual wavelet modes, is uncorrelated and has the Gaussian probability density function but it dissipates the kinetic energy in dissipation range. On the procedure, we propose a new but easy way to get the threshold by applying the energy partition percentage concept about coherent structure. The vorticity field extracted from the wavelet-decomposed velocity field has the same structure as the result of the precedent studies which decomposed vorticity field directly using wavelet. Therefore it has been shown that velocity and vorticity field are on the interactive condition.
Keywords
Discrete Wavelet; Isotropic Turbulence; Coherent Structure; Energy; Threshold; Interactive;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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