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Numerical study of seabed response and liquefaction around a jacket support offshore wind turbine foundation under combined wave and current loading

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Water Science and Engineering 2022年第1期15卷 78-88页

作者： Shu-xin Wei Zuo-dong Liang Lin Cui Hua-ling Zhai Dong-sheng Jeng School of Civil Engineering Qingdao University of TechnologyQingdao 266033China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China School of Engineering&Built Environment Griffith University Gold Coast CampusQueensland 4222Australia

The seabed instability induced by the transient liquefaction when exposed to wave-current may threaten the safety of offshore structures.In this study,the Reynolds-averaged Navier-Stokes(RANS)equations with the k-e turbulence model were used to imitate the fluid dynamics,and Biot's poro-elastic theory was used to simulate the transient seabed response.An in-house solver(porous-fluid-seabed-structure interactions-field operation and manipulation)integrating the flow model and seabed model with the finite volume method was developed.The present model was confirmed with published experimental results and then used to analyze the dynamic process of the fluid-seabed-structure interactions as well as seafloor liquefaction around the jacket foundation under wave-current loading.The simulated results showed that the depth and range for the liquefaction area around the jacket foundation tended to increase at first and then declined as the wave propagated forward in the absence of current.In addition,the results demonstrated that the liquefaction depth under current and wave in the same orientation was greater than that without current.It is worth mentioning that the downstream piles were more prone to liquefaction than the upstream piles when the forward current existed.

关键词： Jacket Wave and current Liquefaction Seafloor dynamic Fluid-seabed-structure interactions

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