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Chang K.,Center for Marine Geotechnical Engineering | Jeng D.,Center for Marine Geotechnical Engineering | Jeng D.,Griffith University | Jeng D.,Hohai University | And 2 more authors.
Proceedings of Institution of Civil Engineers: Energy | Year: 2014

Donghai offshorewind farmnext to Shanghai is the first and largest commercial operating offshorewind energy system in China that adopts a high-rising structure foundation. This paper consists of two parts. Details are presented of this wind farm project, site conditions and related engineering solutions in the first part. Then, in the second part, a threedimensional porous model, based on Reynolds-averaged Navier-Stokes equations and Biot's poro-elastic theory, is developed by integrating three-dimensional wave and seabed models to simulate the wave-induced seabed response around the high-rising structure foundation. A parametric study of the effects of the wave and seabed characteristics on the soil response around the wind turbine foundation is conducted. Results concluded from the numerical analysis are as follows: (a) the existence of the structure has a significant effect on the wave transformation and the distribution of wave-induced pore pressure; (b) the magnitude of wave-induced pore pressure increases as wave height or wave period increases. In addition to the current design of the Donghai offshore wind farm with high-rising structure foundation, a gravity-based foundation is also considered and results are comparedwith those for the high-rising structure foundation.

Guo J.,Center for Marine Geotechnical Engineering | Zhou X.,Center for Marine Geotechnical Engineering | Xu F.,Center for Marine Geotechnical Engineering | Zhang J.,Center for Marine Geotechnical Engineering
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2015

Due to the specific characteristic of seabed and wave, the problem of the dynamic response of seabed under wave is extremely complex. In present paper, a three-dimensional numerical dynamic response model of seabed based on CFD numerical model is built to study the interaction between wave and porous seabed. The model applies Volume of Fluid (VOF) method to track the free surface of water and regard Navier-Stokes equations as governing equations to simulate wave. The seabed is treated as continuous porous medium and characterized by Biot's consolidation theory and partly dynamic (u-p) formulations in which consider the acceleration of soil skeleton. After compared with the result of other papers, the authors verify the availability of this method and a parametric study including wave height, water depth, wave period, degree of saturation is carried out. The numerical results demonstrate that soil parameters obviously affect the pore pressure and effective stress of seabed. ©, 2015, Shuili Xuebao/Journal of Hydraulic Engineering. All right reserved.

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