Journal
FLUID DYNAMICS RESEARCH
Volume 45, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0169-5983/45/4/045504
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Funding
- National Research Foundation of Singapore [NRF-CRP5-2009-01]
- Maritime Research Centre
- Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore
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The wake structure behind a circular cylinder-pair of unequal diameters as a function of incident flow angle alpha (0 degrees <= alpha <= 180 degrees) has been investigated using the particle image velocimetry technique. The Reynolds number Re, center-to-center spacing ratio (P/D) and diameter ratio (d/D) are kept constant at 1200, 1.2 and 2/3, respectively. Instantaneous vorticity contours, mean flow fields and Reynolds shear stress contours are presented to elucidate the flow characteristics. The flow patterns behind the cylinder-pair change from that of a single bluff body to two vortex streets with increasing incident angle over the range of 0 degrees <= alpha <= 90 degrees, while the inverse phenomenon is observed when 90 degrees < alpha <= 180 degrees.
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