Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32068
Title: Smart visualization of multi-scale turbulent structures
Authors: Li, H
Zhou, Y
Takei, M
Saito, Y
Horii, K
Issue Date: 2001
Publisher: IOS Press
Source: International journal of applied electromagnetics and mechanics, 2001, v. 15, no. 1-4 spec, p. 393-402 How to cite?
Journal: International journal of applied electromagnetics and mechanics 
Abstract: The vector wavelet multi-resolution technique based on the orthogonal wavelet transform was used to analyze the velocity vector data that were simultaneously obtained by sixteen X-wires in the turbulent near-wake of a circular cylinder at different streamwise positions. The instantaneous velocity vector field is decomposed into the multi-scale structures, and its sectional streamline of various scales is displayed. The large-scale structures in the plane of mean shear are consistent with the well-known Kármán vortices. The structures that correspond to the saddle region between Kármán vortices are identified with the rib-like structures. Even smaller scale structures are also observed. As increasing x/d, the decay of vortical structure and rib-like structure are observed. The topologies of Reynolds stress and RMS vorticity associated with the multi-scale structures are discussed at different downstream positions. It is found that the most significant contribution to Reynolds stress comes from the frequency components of f ≤ 219 Hz at x/d = 20. However, the contribution to Reynolds stress coming from the intermediate-scale structure becomes weak at x/d = 40. The RMS vorticity components of f = 875 Hz is the largest among all components.
URI: http://hdl.handle.net/10397/32068
ISSN: 1383-5416 (print)
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