Coupling Soil–Fluid–Structure Domains by Localized Lagrange Multipliers Mixed Formulation (u,p) for Modeling Offshore Wind Turbine Vibration

作者：Francisco Ilson da Silva Junior, Onézimo Carlos Viana Cardoso, G. Cunha, André Luiz Ponte de Aguiar · 发表于：International Journal of Computational Methods · 年份：2022 · DOI：10.1142/s0219876222500050 · 被引用次数：2

Modeling is frequently used to design structures in a large range of engineering applications. Coupled models can be solved by several numerical procedures. This paper presents a soil–fluid–structure coupling analysis applied to offshore wind turbines design. The goal of this work is to develop a coupled structural finite element procedure using Localized Lagrange Multipliers (LLM) at idealized offshore wind turbines with poroelastic soil foundation. The poroelastic media theory of Biot is used to represent the soil domain as two-phase material which is considered to be fully saturated with water. The numerical model is validated through a fully coupled model at classical problems results. In this work, the mixed formulation [Formula: see text] is used to model the interface frames between the domains. The interface domain behaves as fictitious porous material generating a nonsymmetrical coupling between elastic solid and potential fluid. The momentum equilibrium and mass continuity equations are solved by algebraic equation system imposed by Lagrange multipliers methodology. In order to fully model the coupled system, aerodynamic decoupling effects are implemented to separate the tower structure, the soil foundation and the rotor-nacelle assembly. This procedure is based on the blade aerodynamic characteristics. The force and moment vectors are assembled considering the aerodynamic damping coupling between inplane and outplane rotor motions. Finally, the equations of the tow...