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http://hdl.handle.net/10397/4817
Title: | Effects of initial conditions on a wavelet-decomposed turbulent near-wake | Authors: | Rinoshika, A Zhou, Y |
Issue Date: | 12-Apr-2005 | 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. | Keywords: | Decomposition Estimation Frequencies Reynolds number Second harmonic generation Temperature measurement Velocity measurement Wavelet transforms |
Publisher: | American Physical Society | Journal: | Physical review. E, Statistical, nonlinear, and soft matter physics | ISSN: | 1539-3755 | EISSN: | 1550-2376 | DOI: | 10.1103/PhysRevE.71.046303 | Rights: | Physical Review E © 2005 The American Physical Society. The Journal's web site is located at http://pre.aps.org/ |
Appears in Collections: | Journal/Magazine Article |
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Rinoshika_Wavelet-decomposed_Turbulent_Near-wake.pdf | 663.06 kB | Adobe PDF | View/Open |
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