Abstract
The prediction and control of vortex-induced vibration (VIV) is one of the key problems for riser design. The effect of platform heave motion on VIV of deep sea top-tensioned riser (TTR) is presented by means of numerical simulation and experiment in this research. First, the heave motion was modeled as a parametric excitation, and the governing equation of VIV of riser considering the parametric excitation was established. Then, the dynamic response of TTR was calculated numerically by the finite difference method based on the Van der Pol wake-oscillator model. Finally, a validation experiment was carried out at the towing tank of Tianjin university. The results show that the VIV response at the bottom of riser is significantly increased due to the platform heave motion, especially in the situation of low current velocity. The larger amplitude and the higher frequency of the platform heave motion with the greater influence are generated on VIV of TTR. In particular, the value of 0.5 times, 1 time, or other multiples of the platform heave frequency will be included in the vibration frequency component of TTR when the platform heave amplitude is large and the frequency is high.
Highlights
With the growing demand of oil and gas, offshore oil and gas explorations are moving into deeper waters
This paper is to investigate the dynamic behavior of top-tensioned riser (TTR) under vortex-induced vibration (VIV) and platform heave motion. e platform heave motion is modeled as a parametric excitation on the top of TTR
Wang et al [16] and Yin et al [17] performed experiments in towing tank for TTR which was excited at the top by platform surge motion, and the results showed that the platform surge had a great influence on VIV of TTR. e platform heave motion was applied as a moving boundary condition at the top of the riser
Summary
Received 31 March 2020; Revised 25 February 2021; Accepted 3 March 2021; Published 17 March 2021. E prediction and control of vortex-induced vibration (VIV) is one of the key problems for riser design. E effect of platform heave motion on VIV of deep sea top-tensioned riser (TTR) is presented by means of numerical simulation and experiment in this research. The heave motion was modeled as a parametric excitation, and the governing equation of VIV of riser considering the parametric excitation was established. En, the dynamic response of TTR was calculated numerically by the finite difference method based on the Van der Pol wake-oscillator model. E results show that the VIV response at the bottom of riser is significantly increased due to the platform heave motion, especially in the situation of low current velocity. E larger amplitude and the higher frequency of the platform heave motion with the greater influence are generated on VIV of TTR. The value of 0.5 times, 1 time, or other multiples of the platform heave frequency will be included in the vibration frequency component of TTR when the platform heave amplitude is large and the frequency is high
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