A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
CF VIV Simulation of Flexible Risers Employing Structural Systems of Different Nonlinearities with a Wake Oscillator
To achieve a reliable structural model for VIV (Vortex-Induced Vibration) prediction of flexible risers, this paper employs structural systems with different geometrical nonlinearities (including a linear structure, a nonlinear one, a coupled CF and axial nonlinear one) and a classical oscillator to simulate CF (Cross-Flow) VIV. By comparing the experimental and simulation results, it is found that when the drag coefficient is assumed to be a fixed constant along the cylinder, it affects the vibration amplitude considerably and may alter the dominant modes. When the excited mode of VIV is bending-stiffness dominant, the CF structural nonlinearities can have a profound stiffening effect on vibration response. Although the introduction of axial deformation can reduce this function, the coupled CF and axial nonlinearities still have the effect of decreasing the VIV amplitude.
CF VIV Simulation of Flexible Risers Employing Structural Systems of Different Nonlinearities with a Wake Oscillator
To achieve a reliable structural model for VIV (Vortex-Induced Vibration) prediction of flexible risers, this paper employs structural systems with different geometrical nonlinearities (including a linear structure, a nonlinear one, a coupled CF and axial nonlinear one) and a classical oscillator to simulate CF (Cross-Flow) VIV. By comparing the experimental and simulation results, it is found that when the drag coefficient is assumed to be a fixed constant along the cylinder, it affects the vibration amplitude considerably and may alter the dominant modes. When the excited mode of VIV is bending-stiffness dominant, the CF structural nonlinearities can have a profound stiffening effect on vibration response. Although the introduction of axial deformation can reduce this function, the coupled CF and axial nonlinearities still have the effect of decreasing the VIV amplitude.
CF VIV Simulation of Flexible Risers Employing Structural Systems of Different Nonlinearities with a Wake Oscillator
Shuai, Meng (author) / Xuefeng, Wang
2016
Article (Journal)
English
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