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<p>The nonlinear interaction of the high-steep waves with a bottom-fixed monopile is studied experimentally and numerically in this research. The predominance of the near-breaking waves in sea-bottom-effect waters where fixed structures such as wind turbines have been located drives the incentive of the endeavour. Hence, viscous fluid kinematics due to the interaction of regular and irregular wave regimes with the monopile is determined by using a three-dimensional viscous numerical model that takes advantage of an implicit finite volume to solve the Reynolds Average Navier–Stokes (RANS) equation. The volume of fluid method is exploited to treat the air–water interface. Moreover, the physical model test is carried out to record wave loads and kinematics of the free surface flow around the monopile. A range of nonlinear waves is considered for experimental and numerical models, from weakly nonlinear waves to near-breaking waves. The accuracy and convergence tests for different mesh sizes are conducted on the numerical model, and the numerical results are compared with the experimental data for verification. To reveal the nonlinearities of the shear force and the bending moment, the spectral analysis is run on the time-history of results. Furthermore, the fidelity of the numerical viscous model is evaluated for different sea states. The analogous study is replicated for a broad range of irregular waves to recognise the higher-order wave loads driven by the inertia forces and the diffraction.</p>

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Analysis of shallow water steep waves interaction with a bottom-fixed monopile offshore wind turbine using an implicit Navier–Stokes and experimental model

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  • 出版模式：

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  • 发表日期：

    2025年7月4日

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  • Abdolmajid Moghtadaei,
  • Madjid Karimirad,
  • Arash Abbasnia,
  • Charles Young,
  • Trevor Whittaker

摘要

The nonlinear interaction of the high-steep waves with a bottom-fixed monopile is studied experimentally and numerically in this research. The predominance of the near-breaking waves in sea-bottom-effect waters where fixed structures such as wind turbines have been located drives the incentive of the endeavour. Hence, viscous fluid kinematics due to the interaction of regular and irregular wave regimes with the monopile is determined by using a three-dimensional viscous numerical model that takes advantage of an implicit finite volume to solve the Reynolds Average Navier–Stokes (RANS) equation. The volume of fluid method is exploited to treat the air–water interface. Moreover, the physical model test is carried out to record wave loads and kinematics of the free surface flow around the monopile. A range of nonlinear waves is considered for experimental and numerical models, from weakly nonlinear waves to near-breaking waves. The accuracy and convergence tests for different mesh sizes are conducted on the numerical model, and the numerical results are compared with the experimental data for verification. To reveal the nonlinearities of the shear force and the bending moment, the spectral analysis is run on the time-history of results. Furthermore, the fidelity of the numerical viscous model is evaluated for different sea states. The analogous study is replicated for a broad range of irregular waves to recognise the higher-order wave loads driven by the inertia forces and the diffraction.