Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8242
Title: Comparison between triangular cylinder and screen near-wakes in the orthogonal wavelet representation
Authors: Li, H
Zhou, Y
Keywords: Flow measurements
Initial conditions
Multi-scale flow structures
Near wake
Orthogonal wavelet transform
Turbulence
Vector wavelet multi-resolution analysis
Vortex
Issue Date: 2003
Publisher: Japan Soc Mechanical Engineers
Source: JSME international journal, series b : fluids and thermal engineering, 2003, v. 46, no. 3, p. 366-376 How to cite?
Journal: JSME International Journal, Series B: Fluids and Thermal Engineering 
Abstract: The near wake generated by a triangular cylinder and a screen, respectively, has been investigated with a view to provide information on the effect of initial conditions on turbulence structures of various scales based on the wavelet multi-resolution analysis. The velocity data were simultaneously obtained at x/h (x is the streamwise distance downstream of the wake generator and h is the height of the wake generator) =20 using a rake of eight X-wires aligned in the plane of mean shear. A vector wavelet multi-resolution technique was applied to decompose the velocity data into a number of wavelet components based on the central frequencies. The instantaneous sectional streamlines and vorticity field were used to reveal the turbulent structures at each wavelet component/central frequency. It was found that the behavior of large- and intermediate-scale structures depend on the initial conditions and the small-scale structures are independent of the initial conditions. The contributions from the wavelet components to the time-averaged Reynolds stresses and vorticity variance were estimated. Both the large-scale and intermediate longitudinal structures make the most significant contributions to Reynolds stresses in the triangular cylinder wake, but the contribution from the large-scale structures appears dominating in the screen wake. The relatively small-scale structures of the triangular cylinder wake contribute most to the total spanwise vorticity variance.
URI: http://hdl.handle.net/10397/8242
ISSN: 1340-8054
DOI: 10.1299/jsmeb.46.366
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