Analysis of Vortex-induced Vibration and Fatigue Characteristics of High-pressure Riser in Shallow Sea
With the continuous development of oil and gas resources in the East China Sea,jack-up platforms with lower development costs will be widely used.The marine environment where the riser is located is complex and changeable.Due to the large ratio of structural length to diameter,vortex-induced vibrations will occur under the action of ocean currents.In this paper,the wake oscillator model is used to predict the vortex-induced vibration of the high-pressure riser.Based on the content of the DNV specification,the S-N curve method is used to calculate the structural fatigue.The model is discretely solved by the finite difference method.The research focuses on the influence of the top tension with the vortex-induced vibration and fatigue characteristics of the riser.It is found that the top tension will affect the vortex-induced vibration response of the riser,and further change the fatigue life of the structure,and head affect the safety of the structure.
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