Fluctuating lift on a circular cylinder: review and new measurements |
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| Institution: | 1. South Ural state agrarian University, 75, Lenin Avenue, Chelyabinsk, 454080, The Russian Federation;2. South Ural State University, 76, Lenin Avenue, Chelyabinsk, 454080, The Russian Federation;1. Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;2. Key Lab of Advanced Manufacturing Technology, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;3. School of Civil and Resource Engineering, The University of Western Australia, Australia;1. Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, UK;2. Institute for Sustainable Industries and Liveable Cities, Victoria University, Melbourne, Vic 8001, Australia;3. School of Manufacturing Engineering, University Malaysia Perlis, 02600 Arau, Perlis, Malaysia;1. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, PR China;2. DICDEA, University of Campania “Luigi Vanvitelli”, Via Roma 9, 81031 Aversa, CE, Italy |
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| Abstract: | Apart from providing some new experimental data the paper reviews previous investigations concerning fluctuating lift acting on a stationary circular cylinder in cross-flow. In particular, effects of Reynolds number in the nominal case of an infinitely long and nonconfined cylinder in a smooth oncoming flow are discussed. The Reynolds number range covered is from about Re=47 to 2×105, i.e., from the onset of vortex shedding up to the end of the subcritical regime. At the beginning of the subcritical regime (Re≃0.3×103) a spanwise correlation length of about 30 cylinder diameters is indicated, the correlation function being based on near-cylinder velocity fluctuations in outer parts of the separated shear layer. In between Reynolds numbers 1.6×103 and 20×103, an approximate 10-fold increase in the sectional r.m.s. lift coefficient is indicated. This range contains a fundamental change-over from one flow state to another, starting off at Re≃5×103 and seemingly fully developed at Re≃8×103. |
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