Wavelet Analysis on Turbulent Structure in Drag-Reducing Channel Flow Based on Direct Numerical Simulation
Joint Authors
Source
Advances in Mechanical Engineering
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-03-20
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
Direct numerical simulation has been performed to study a polymer drag-reducing channel flow by using a discrete-element model.
And then, wavelet analyses are employed to investigate the multiresolution characteristics of velocity components based on DNS data.
Wavelet decomposition is applied to decompose velocity fluctuation time series into ten different frequency components including approximate component and detailed components, which show more regular intermittency and burst events in drag-reducing flow.
The energy contribution, intermittent factor, and intermittent energy are calculated to investigate characteristics of different frequency components.
The results indicate that energy contributions of different frequency components are redistributed by polymer additives.
The energy contribution of streamwise approximate component in drag-reducing flow is up to 82%, much more than 25% in the Newtonian flow.
Feature of turbulent multiscale structures is shown intuitively by continuous wavelet transform, verifying that turbulent structures become much more regular in drag-reducing flow.
American Psychological Association (APA)
Wu, Xuan& Yu, B.& Wang, Yi. 2013. Wavelet Analysis on Turbulent Structure in Drag-Reducing Channel Flow Based on Direct Numerical Simulation. Advances in Mechanical Engineering،Vol. 2013, no. 2013, pp.1-10.
https://search.emarefa.net/detail/BIM-477697
Modern Language Association (MLA)
Wu, Xuan…[et al.]. Wavelet Analysis on Turbulent Structure in Drag-Reducing Channel Flow Based on Direct Numerical Simulation. Advances in Mechanical Engineering No. 2013 (2013), pp.1-10.
https://search.emarefa.net/detail/BIM-477697
American Medical Association (AMA)
Wu, Xuan& Yu, B.& Wang, Yi. Wavelet Analysis on Turbulent Structure in Drag-Reducing Channel Flow Based on Direct Numerical Simulation. Advances in Mechanical Engineering. 2013. Vol. 2013, no. 2013, pp.1-10.
https://search.emarefa.net/detail/BIM-477697
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-477697