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Title: Effects of initial conditions on a wavelet-decomposed turbulent near-wake
Authors: Rinoshika, Akira
Zhou, Yu
Subjects: Decomposition
Reynolds number
Second harmonic generation
Temperature measurement
Velocity measurement
Wavelet transforms
Issue Date: 12-Apr-2005
Publisher: American Physical Society
Source: Physical review E, statistical, nonlinear, and soft matter physics, Apr. 2005, v. 71, no. 4, 046303, p. 1-8.
Abstract: The effect of initial conditions on the turbulent structures of various scales in a near-wake has been investigated for two wake generators, i.e., a circular cylinder and screen of 50% solidity, of the same characteristic dimension. Velocity data were obtained at x∕h (x and h are the streamwise distance downstream and the height of the wake generators, respectively) =20 using 16 X wires, eight aligned in the plane of mean shear and eight in the plane parallel to both the cylinder axis and the flow direction. A wavelet multiresolution technique was used to decompose the velocity data into a number of wavelet components based on the central frequencies, which correspond to the scales of turbulent structures. It was found that the behaviors of intermediate- as well as large-scale structures depend on the initial conditions. In the circular cylinder wake, the large- and intermediate-scale structures make the largest (and comparable) contribution to Reynolds stresses, but in the screen wake there is a significant difference in the contribution between the two types of structures. The two-dimensionality of the wavelet component is also examined.
Rights: Physical Review E © 2005 The American Physical Society. The Journal's web site is located at
Type: Journal/Magazine Article
DOI: 10.1103/PhysRevE.71.046303
ISSN: 1539-3755 (print)
1550-2376 (online)
Appears in Collections:ME Journal/Magazine Articles

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