Journal of Fluid Mechanics

Flow past short circular cylinders with two free ends

M. M.  Zdravkovich a1, V. P.  Brand a1, G.  Mathew a1p1 and A.  Weston a1
a1 Department of Aeronautical and Mechanical Engineering, University of Salford, Salford M5 4WT, UK

Article author query
zdravkovich mm   [Google Scholar] 
brand vp   [Google Scholar] 
mathew g   [Google Scholar] 
weston a   [Google Scholar] 


Preliminary tests have been carried out on short circular cylinders with both ends free. Drag force is measured across the range 6 × 104 < Re < 2.6 × 105 for cylinders of length to diameter ratio L/D between 1 and 10. The effect of hemispherical ends is also investigated. A kind of periodic vortex shedding is found in the range 2 < L/D < 8. The oil-film surface flow visualization shows that the ‘eyes’ near the free ends (regions of low pressure) gradually disappear as L/D is reduced to 3. An asymmetric flow pattern is established for very short cylinders (L/D < 3). The detailed measurements of pressure distribution along and across models shows asymmetries of minimum and base pressures along the span. The asymmetric flow produces yawing and rolling moments which are also measured.

(Published Online April 26 2006)
(Received April 3 1987)
(Revised January 10 1989)

p1 Present address: Arthur Andersen & Co., The Information Consultancy, Chicago, Illinois, USA.