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Journal of the Brazilian Society of Mechanical Sciences and Engineering

Print version ISSN 1678-5878

Abstract

ROSETTI, Guilherme F.; GONCALVES, Rodolfo T.; FUJARRA, André L. C.  and  NISHIMOTO, Kazuo. Parametric analysis of a phenomenological model for vortex-induced motions of monocolumn platforms. J. Braz. Soc. Mech. Sci. & Eng. [online]. 2011, vol.33, n.2, pp.139-146. ISSN 1678-5878.  http://dx.doi.org/10.1590/S1678-58782011000200004.

Phenomenological models are an important branch in VIV (Vortex-Induced Vibrations) and in VIM (Vortex-Induced Motions) studies to complement the results achieved via CFD (Computational Fluid Dynamics), as the latter tool is not presently a suitable tool for intense use in engineering analysis, due to high computer power requirements. A phenomenological model for evaluating the VIM on monocolumn platforms is presented and its results are compared with experimental ones. The main objective is to present a parametric analysis, focusing on the physical significance of the modifications in parameter values. The following parameters are varied: aspect ratio (L/D), structural damping (ξ), fluid damping (γ) and Strouhal number (S). The results are presented in terms of: non-dimensional amplitudes of motion (AX/D and AY/D), added mass coefficient (Ca) and periods of motion (TX and TY). The phenomenological model is based on a time-domain, two degree-of-freedom structural model coupled with van der Pol wake oscillators. The governing equations are solved through fourth-order Runge-Kutta schemes.

Keywords : vortex-induced motions (VIM); phenomenological model; van der Pol wake oscillator; two degree-of-freedom; monocolumn platform.

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