FLUID BEHAVIOUR OF SIDE-BY-SIDE CIRCULAR CYLINDERS IN STEADY CROSS-FLOW

• Published in: Journal of fluids and structures 1999-04, Vol.13 (3), p.309-338
• Main Authors: SUMNER, D, WONG, S.S.T, PRICE, S.J, PAÏDOUSSIS, M.P
• Format: Article
• Language: English
• Subjects: Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Instrumentation for fluid dynamics; Jets; Physics; Rotational flow and vorticity; Separated flows; Turbulent flows, convection, and heat transfer; Wakes
• ISSN: 0889-9746; 1095-8622
• DOI: 10.1006/jfls.1999.0205

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.