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Drag and inertia coefficients for a circular cylinder in steady plus low-amplitude oscillatory flows |
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| Institution: | 1. Department of Mechanical Engineering, University of Western Macedonia, Bakola & Sialvera, Kozani 50132, Greece;2. School of Mechanical Engineering, National Technical University of Athens, Zografou 15780, Greece;1. Laboratory of Maritime Engineering, Barcelona Tech, D1 Campus Nord, Jordi Girona 1-3, 08034 Barcelona, Spain;2. Department of Civil and Environmental Engineering, Barcelona Tech, C2 Campus Nord, Jordi Girona 1-3, 08034 Barcelona, Spain;3. Centro Euro-Mediterraneo sui Cambiamenti Climatici, Via Augusto Imperatore, 16, Lecce, Italy;1. Hyundai Maritime Research Institute, Hyundai Heavy Industries, Co. Ltd., Ulsan, Republic of Korea;2. Research Institute of Marine Systems Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea;3. Defense Acquisition Program Administration, Seoul, Republic of Korea;4. Dept. of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, Republic of Korea |
| Abstract: | Computer simulations of steady plus low-amplitude oscillatory flow about a circular cylinder are reported at a fixed Reynolds number of 150 based on the steady component. The conventional Keleugan–Carpenter number based on the oscillatory component is fixed at π/5. The oscillation frequency is varied so as to study a wide spectrum of flows where inertial forces dominate at one end and viscous drag forces at the other as a function of the modified Keleugan–Carpenter number. The hydrodynamic force on the cylinder in-line with the flow direction is represented by Morison's equation and an extended version with three terms. The drag and inertia coefficients in Morison's equation are determined by least-squares fits to data directly computed from integration of skin friction and pressure distributions around the periphery of the cylinder. The root-mean-square value of the residue of reconstructed minus directly-computed forces varies between 2 and 41% depending on the flow parameters. Comparable results can be obtained with a semi-theoretical approach using inviscid inertia and quasi-steady viscous drag terms. Physical explanations for the variation of the force coefficients are provided and implications for pertinent flow–structure interactions are discussed. |
| Keywords: | Unsteady hydrodynamics Fluid loading Flow–structure interaction |
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