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Characterization of variable hydrodynamic coefficients and maximum responses in two-dimensional vortex-induced vibrations with dual resonances

Lookup NU author(s): Dr Narakorn SrinilORCiD

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Abstract

A phenomenological model and analytical–numerical approach to systematically characterize variable hydrodynamic coefficients and maximum achievable responses in two-dimensional vortex-induced vibrations with dual two-to-one resonances are presented. The model is based on double Duffing and van der Pol oscillators which simulate a flexibly mounted circular cylinder subjected to uniform flow and oscillating in simultaneous cross-flow/in-line directions. Depending on system quadratic and cubic nonlinearities, amplitudes, oscillation frequencies and phase relationships, analytical closed-form expressions are derived to parametrically evaluate key hydrodynamic coefficients governing the fluid excitation, inertia and added mass force components, as well as maximum dual-resonant responses. The amplification of the mean drag is ascertained. Qualitative validations of numerical predictions with experimental comparisons are discussed. Parametric investigations are performed to highlight the important effects of system nonlinearities, mass, damping, and natural frequency ratios.

Publication metadata

Author(s): Zanganeh H, Srinil N

Publication type: Article

Publication status: Published

Journal: Journal of Vibration and Acoustics

Year: 2014

Volume: 136

Issue: 5

Print publication date: 01/10/2014

Online publication date: 25/07/2014

Acceptance date: 02/06/2014

Date deposited: 02/02/2016

ISSN (print): 1048-9002

ISSN (electronic): 1528-8927

Publisher: American Society of Mechanical Engineers

URL: http://dx.doi.org/10.1115/1.4027805

DOI: 10.1115/1.4027805

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