On flow unsteadiness induced by structural vibration |
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| Institution: | 1. Institut Pprime, CNRS, Université de Poitiers, ISAE–ENSMA, 86962 Futuroscope Chasseneuil, France;2. Department of Aeronautics, Imperial College London, London, SW7 2AZ, UK;1. Departamento de Física, Universidad de Guadalajara, Mexico;2. Aix-Marseille Université, IUT GTE, Marseille, France;3. Aix Marseille Université, CNRS, Centrale Marseille, IRPHE UMR 7342, 13384 Marseille, France;1. Cockcroft Institute, Warrington WA44AD, UK;2. University of Liverpool, Physics Department, L697ZE Liverpool, UK;3. CERN, 1211 Geneva, Switzerland;4. RIKEN Nishina Center, 351-0198 Wako, Japan;1. Department of Engineering University Roma Tre, Via della Vasca Navale 79, 00146, Rome, Italy;2. Sustainable Combustion Lab COMSO, Via Anguillarese 301, 00123, Santa Maria di Galeria, Rome, Italy |
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| Abstract: | In this paper, the effects of structural vibration on flow unsteadiness are investigated numerically. A fully coupled model, that solves the unsteady flow equations as well as the dynamic equations of the structure, is used. Numerical experiments are carried-out for flow over a backward-facing step, where a large number of numerical and experimental data exist for comparisons. The flexible structure is upstream of the step and is excited by a plane acoustic wave from the side opposite to the flow. Three Reynolds number cases are studied: 300 for a laminar flow, 3000 for a transitional flow and 15 000 for a turbulent flow. The results obtained are in good agreement with experimental observations and show the strong coupling between structural vibration and the resulting flow unsteadiness. |
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