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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v40.i2.70
pages 168-183

Near Wake Structure of Wall-Mounted Finite Cylinders in Shallow Open Channel Flow

Martin Agelin-Chaab
Automotive, Mechanical and Manufacturing Engineering Department, University of Ontario Institute of Technology Oshawa, ON, L1H 7K4, Canada
S. S. Paul
CG Power Systems Canada Inc. Winnipeg MB, Canada

RÉSUMÉ

This paper reports an experimental investigation of the structure of the flow field around wall-mounted finite circular and square cylinders in an open water channel. A particle image velocimetry technique was used to conduct detailed velocity measurements in the streamwise-transverse and streamwise-spanwise planes. From these measurements, the iso-contours and profiles of the mean velocities and turbulent quantities were obtained at selected streamwise locations to document the salient flow features. The wake half-width of the square cylinder is 23 % higher than that of the circular cylinder but their spanwise spread rates are both linear and similar. The square cylinder generates more turbulence at its free end than the circular cylinder which is evidenced by the higher turbulent quantities. The proper orthogonal decomposition (POD) analysis revealed that for each cylinder type there are more energetic structures in the streamwise-spanwise plane than in the streamwise-transverse plane. There are also more energetic structures in the square cylinder than the circular cylinder.


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