Enhancing PIV image and fractal descriptor for velocity and shear stresses propagation around a circular pier

Keshavarzi, A; Ball, J

Enhancing PIV image and fractal descriptor for velocity and shear stresses propagation around a circular pier

Keshavarzi, A Ball, J

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Publication Type:: Journal Article
Citation:: Geoscience Frontiers, 2017, 8 (4), pp. 869 - 883
Issue Date:: 2017-07-01

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Field	Value	Language
dc.contributor.author	Keshavarzi, A	en_US
dc.contributor.author	Ball, J https://orcid.org/0000-0001-8342-1916	en_US
dc.date.available	2016-07-09	en_US
dc.date.issued	2017-07-01	en_US
dc.identifier.citation	Geoscience Frontiers, 2017, 8 (4), pp. 869 - 883	en_US
dc.identifier.issn	1674-9871	en_US
dc.identifier.uri	http://hdl.handle.net/10453/124029
dc.description.abstract	© 2016 China University of Geosciences (Beijing) and Peking University In this study, the fractal dimensions of velocity fluctuations and the Reynolds shear stresses propagation for flow around a circular bridge pier are presented. In the study reported herein, the fractal dimension of velocity fluctuations (u′, v′, w′) and the Reynolds shear stresses (u′v′ and u′w′) of flow around a bridge pier were computed using a Fractal Interpolation Function (FIF) algorithm. The velocity fluctuations of flow along a horizontal plane above the bed were measured using Acoustic Doppler Velocity meter (ADV) and Particle Image Velocimetry (PIV). The PIV is a powerful technique which enables us to attain high resolution spatial and temporal information of turbulent flow using instantaneous time snapshots. In this study, PIV was used for detection of high resolution fractal scaling around a bridge pier. The results showed that the fractal dimension of flow fluctuated significantly in the longitudinal and transverse directions in the vicinity of the pier. It was also found that the fractal dimension of velocity fluctuations and shear stresses increased rapidly at vicinity of pier at downstream whereas it remained approximately unchanged far downstream of the pier. The higher value of fractal dimension was found at a distance equal to one times of the pier diameter in the back of the pier. Furthermore, the average fractal dimension for the streamwise and transverse velocity fluctuations decreased from the centreline to the side wall of the flume. Finally, the results from ADV measurement were consistent with the result from PIV, therefore, the ADV enables to detect turbulent characteristics of flow around a circular bridge pier.	en_US
dc.relation.ispartof	Geoscience Frontiers	en_US
dc.relation.isbasedon	10.1016/j.gsf.2016.07.004	en_US
dc.title	Enhancing PIV image and fractal descriptor for velocity and shear stresses propagation around a circular pier	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	8	en_US
utslib.for	0402 Geochemistry	en_US
utslib.for	0403 Geology	en_US
utslib.for	0404 Geophysics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	8	en_US

Abstract:

© 2016 China University of Geosciences (Beijing) and Peking University In this study, the fractal dimensions of velocity fluctuations and the Reynolds shear stresses propagation for flow around a circular bridge pier are presented. In the study reported herein, the fractal dimension of velocity fluctuations (u′, v′, w′) and the Reynolds shear stresses (u′v′ and u′w′) of flow around a bridge pier were computed using a Fractal Interpolation Function (FIF) algorithm. The velocity fluctuations of flow along a horizontal plane above the bed were measured using Acoustic Doppler Velocity meter (ADV) and Particle Image Velocimetry (PIV). The PIV is a powerful technique which enables us to attain high resolution spatial and temporal information of turbulent flow using instantaneous time snapshots. In this study, PIV was used for detection of high resolution fractal scaling around a bridge pier. The results showed that the fractal dimension of flow fluctuated significantly in the longitudinal and transverse directions in the vicinity of the pier. It was also found that the fractal dimension of velocity fluctuations and shear stresses increased rapidly at vicinity of pier at downstream whereas it remained approximately unchanged far downstream of the pier. The higher value of fractal dimension was found at a distance equal to one times of the pier diameter in the back of the pier. Furthermore, the average fractal dimension for the streamwise and transverse velocity fluctuations decreased from the centreline to the side wall of the flume. Finally, the results from ADV measurement were consistent with the result from PIV, therefore, the ADV enables to detect turbulent characteristics of flow around a circular bridge pier.

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http://hdl.handle.net/10453/124029