Fluid Behaviour of Side-By-Side Circular Cylinders in Steady Cross-Flow

Author: Sumner D.   Wong S.S.T.   Price S.J.   PAÏDOUSSIS M.P.  

Publisher: Academic Press

ISSN: 0889-9746

Source: Journal of Fluids and Structures, Vol.13, Iss.3, 1999-04, pp. : 309-338

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Abstract

The flow field for two and three circular cylinders of equal diameter D arranged in a side-by-side configuration in steady cross-flow was investigated using flow visualization, hot-film anemometry and particle image velocimetry (PIV), for centre-to-centre pitch ratios from T/D=1·0 to 6·0, and Reynolds numbers from Re=500 to 3000. For two-cylinder arrangements, three basic flow patterns were observed: single bluff-body vortex shedding at small T/D , biased flow with synchronized vortex shedding at intermediateT/D , and symmetric flow with synchronized vortex shedding at larger T/D . For three-cylinder arrangements, either single bluff-body behaviour or an asymmetric biased flow pattern could be observed at smallT/D , whereas a symmetric-biased flow pattern was found at intermediate T/D . Instantaneous representations of the in-plane vorticity field obtained from the PIV technique revealed some variation in these basic flow patterns at given T/D and Re.