scholarly journals Empirical sensitivity of two-dimensional nonlinear wake–cylinder oscillators in cross-flow/in-line vortex-induced vibrations

2018 ◽  
Vol 83 ◽  
pp. 310-338 ◽  
Author(s):  
Narakorn Srinil ◽  
Pierre-Adrien Opinel ◽  
Francesca Tagliaferri
Keyword(s):  
Cross Flow ◽  
Two Dimensional ◽  
Line Vortex ◽  
Vortex Induced Vibrations

Characterization of Variable Hydrodynamic Coefficients and Maximum Responses in Two-Dimensional Vortex-Induced Vibrations With Dual Resonances

2014 ◽  
Vol 136 (5) ◽  
Author(s):  
Hossein Zanganeh ◽  
Narakorn Srinil
Keyword(s):  
Cross Flow ◽  
Numerical Approach ◽  
Mass Force ◽  
Hydrodynamic Coefficients ◽  
Two Dimensional ◽  
Numerical Predictions ◽  
Vortex Induced Vibrations ◽  
Van Der Pol Oscillators ◽  
Force Components ◽  
Oscillation Frequencies

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.

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