Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows

An experimental study was conducted on aspect-ratio of six finite-length wavy cylinders immersed within a Re D = 2,700 free-stream. Wavelengths of 2 and 4 diameters, as well as wave amplitude of 0.1, 0.2 and 0.3 diameters were used for a comprehensive investigation. Time-resolved particle-image velo...

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Main Authors: New, T. H., Shi, Shengxian., Liu, Yingzheng.
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/85695
http://hdl.handle.net/10220/16770
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-856952023-03-04T17:15:41Z Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows New, T. H. Shi, Shengxian. Liu, Yingzheng. School of Mechanical and Aerospace Engineering DRNTU::Engineering::Aeronautical engineering An experimental study was conducted on aspect-ratio of six finite-length wavy cylinders immersed within a Re D = 2,700 free-stream. Wavelengths of 2 and 4 diameters, as well as wave amplitude of 0.1, 0.2 and 0.3 diameters were used for a comprehensive investigation. Time-resolved particle-image velocimetry measurements and proper orthogonal decomposition analyses show that for the present large wavelength wavy cylinders, vortex-shedding behaviour of high aspect-ratio wavy cylinders observed in past studies can be altered through variations in the aspect-ratio, exact geometric node and saddle locations, as well as the presence of end-walls. This is due to the persistent formation of recirculating regions close to the end-walls under certain wavy cylinder configurations, which affect the distributions of spanwise flows and vortex formation lengths. Vortex-shedding behaviour of smaller-wavelength wavy cylinders has also been observed to be considerably less sensitive to variations in the physical configurations, due to the formation of multiple streamwise vortices at the saddles. The presence of these coherent streamwise vortices is postulated to play a key role in significantly reducing flow-altering effects associated with the end-walls. Accepted version 2013-10-24T06:33:28Z 2019-12-06T16:08:26Z 2013-10-24T06:33:28Z 2019-12-06T16:08:26Z 2013 2013 Journal Article New, T. H., Shi, S., & Liu, Y. (2013). Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows. Experiments in Fluids, (54), 1-24. 0723-4864 https://hdl.handle.net/10356/85695 http://hdl.handle.net/10220/16770 10.1007/s00348-013-1601-8 174697 en Experiments in fluids © 2013 Springer-Verlag Berlin Heidelberg. This is the author created version of a work that has been peer reviewed and accepted for publication by Experiments in Fluids, Springer-Verlag Berlin Heidelberg. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1007/s00348-013-1601-8]. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Aeronautical engineering
spellingShingle DRNTU::Engineering::Aeronautical engineering
New, T. H.
Shi, Shengxian.
Liu, Yingzheng.
Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows
description An experimental study was conducted on aspect-ratio of six finite-length wavy cylinders immersed within a Re D = 2,700 free-stream. Wavelengths of 2 and 4 diameters, as well as wave amplitude of 0.1, 0.2 and 0.3 diameters were used for a comprehensive investigation. Time-resolved particle-image velocimetry measurements and proper orthogonal decomposition analyses show that for the present large wavelength wavy cylinders, vortex-shedding behaviour of high aspect-ratio wavy cylinders observed in past studies can be altered through variations in the aspect-ratio, exact geometric node and saddle locations, as well as the presence of end-walls. This is due to the persistent formation of recirculating regions close to the end-walls under certain wavy cylinder configurations, which affect the distributions of spanwise flows and vortex formation lengths. Vortex-shedding behaviour of smaller-wavelength wavy cylinders has also been observed to be considerably less sensitive to variations in the physical configurations, due to the formation of multiple streamwise vortices at the saddles. The presence of these coherent streamwise vortices is postulated to play a key role in significantly reducing flow-altering effects associated with the end-walls.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
New, T. H.
Shi, Shengxian.
Liu, Yingzheng.
format Article
author New, T. H.
Shi, Shengxian.
Liu, Yingzheng.
author_sort New, T. H.
title Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows
title_short Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows
title_full Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows
title_fullStr Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows
title_full_unstemmed Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows
title_sort cylinder-wall interference effects on finite-length wavy cylinders at subcritical reynolds number flows
publishDate 2013
url https://hdl.handle.net/10356/85695
http://hdl.handle.net/10220/16770
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