Numerical Analysis of Nonlinear Hydrodynamic Performance in an Innovative Composite Monopile Foundation for Offshore Wind Turbines Using a Fully Nonlinear Potential Flow Model

Shuang Liang, Lin Lin (), Fayun Liang, Panpan Shen and Shilun Zhao
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Shuang Liang: Shanghai Investigation, Design and Research Institute Co., Ltd., Shanghai 200335, China
Lin Lin: Shanghai Investigation, Design and Research Institute Co., Ltd., Shanghai 200335, China
Fayun Liang: Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Panpan Shen: Shanghai Investigation, Design and Research Institute Co., Ltd., Shanghai 200335, China
Shilun Zhao: Shanghai Investigation, Design and Research Institute Co., Ltd., Shanghai 200335, China

Sustainability, 2025, vol. 17, issue 11, 1-19

Abstract: Offshore wind turbines serve as critical infrastructure components in marine renewable energy systems, enabling sustainable energy extraction within offshore engineering frameworks. Monopile foundations for offshore wind turbines in deep-water environments are subjected to strong nonlinear wave actions. This study introduces a novel composite monopile foundation specifically designed for deep-sea applications, with its fully nonlinear hydrodynamic performance systematically investigated using potential flow theory. The novel hybrid monopile incorporates a concrete-filled double-skin steel tubular (CFDST) configuration to reduce pile diameter at water level. In the numerical model, the higher-order boundary element method (HOBEM) is implemented to resolve boundary value problems at each temporal iteration. Following numerical validation, nonlinear wave loading and run-up characteristics for the CFDST hybrid structure are quantified, while the limitations of Morison’s equation for large-scale structures under strongly nonlinear wave conditions are concurrently assessed. Results indicate that CFDST implementation effectively attenuates both nonlinear hydrodynamic forces and wave run-up amplitudes, enabling safer and more economical design approaches for deep-water offshore wind turbine foundations.

Keywords: offshore wind turbine; novel hybrid monopile; fully nonlinear waves; potential flow theory; sustainable energy; higher-order boundary element method (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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