Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/85695
Title: Cylinder-wall interference effects on finite-length wavy cylinders at subcritical Reynolds number flows
Authors: New, T. H.
Shi, Shengxian.
Liu, Yingzheng.
Keywords: DRNTU::Engineering::Aeronautical engineering
Issue Date: 2013
Source: 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.
Series/Report no.: Experiments in fluids
Abstract: 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.
URI: https://hdl.handle.net/10356/85695
http://hdl.handle.net/10220/16770
ISSN: 0723-4864
DOI: 10.1007/s00348-013-1601-8
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 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].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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