VIV analysis of a single elastically-mounted 2D cylinder: Parameter Identification of a single-degree-of-freedom multi-frequency model
| Autor: | Riccardo Pigazzini, Mitja Morgut, Simone Martini, Thomas Puzzer, Andrea Mola, Giorgio Contento |
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| Přispěvatelé: | Pigazzini, Riccardo, Contento, Giorgio, Martini, Simone, Puzzer, Thoma, Morgut, Mitja, Mola, Andrea |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Parameter identification
media_common.quotation_subject 020101 civil engineering 02 engineering and technology Computational fluid dynamics Inertia 01 natural sciences 010305 fluids & plasmas 0201 civil engineering Physics::Fluid Dynamics Settore MAT/08 - Analisi Numerica VIV sdof-mf model CFD 0103 physical sciences Cylinder media_common Physics business.industry Mechanical Engineering Mechanics Vortex shedding Vortex Vibration Drag Harmonics business |
| Popis: | A novel single-degree-of-freedom multi-frequency model (sdof-mf) for the prediction of the Vortex Induced Vibrations (VIV) of an elastically mounted circular cylinder in two-dimensional cross flow is presented. The proposed model treats the total hydrodynamic force as sum of conventional Morison-like inertia and drag terms related to the cylinder motion in still fluid plus additional harmonics that account for the lift force induced by vortex shedding. Amplitudes, frequencies and phase lags of these harmonics are identified using a Parameter Identification (PI) procedure applied to time domain data of vortex induced forces, here obtained via CFD simulations. The proposed sharp identification via PI of the independent frequencies of the vortex shedding fluid force is the peculiarity of the proposed method. The model is assessed considering a wide range of flow regimes, including lock-in conditions. From the overall results, the proposed sdof-mf model exhibits promising but consistent capabilities in the reproduction of the vortex shedding forces and cylinder motion, in terms of both amplitudes and frequencies. |
| Databáze: | OpenAIRE |
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