The present study investigates experimentally and numerically the impact of composite materials on hydro-elastic performances of a hydrofoil experiencing Fluid–Structure Interactions, and focus on the bend–twist coupling phenomenon. Four flexible hydrofoils piercing the free surface, with identical geometry of extruded plan-form, a constant NACA0015 section, are tested in a cantilevered configuration in a hydrodynamic flume. The hydrofoils are built from the same mold with different materials (carbon or glass fiber) and different layups. The layups are designed to allow or not bend–twist coupling by the use of $\pm$ 45°plies in the structure. Two different coupled FSI numerical approaches are developed to model the hydrofoils behavior: a low fidelity code based on the coupling of a Vortex Lattice Method and a beam theory and a high fidelity code made of the coupling of the structural model code–ASTER and an OpenFOAM VoF hydrodynamic model with free surface. Mechanical characterization of the hydrofoils highlights the differences on the structures which are exacerbated in the hydrodynamic tests. The bend–twist coupling induces a modification of the angle of attack at the tip, leading to a significant difference of the generated lift and thus the deformation. The bend–twist coupling and the hydrodynamic performances are simulated by the numerical approaches.

本研究通过实验和数值研究了复合材料对经历流固耦合的水翼的水弹性能的影响，并着重于弯扭耦合现象。在悬臂结构的流体动力水槽中测试了四根穿过自由表面的柔性水翼，它们具有相同的挤压平面形状，恒定的NACA0015截面。水翼由具有不同材料（碳或玻璃纤维）和不同叠层的同一模具制成。叠层的设计允许通过使用$\pm$结构中成45°角。开发了两种不同的FSI耦合数值方法来模拟水翼行为：基于涡形格子法和梁理论耦合的低保真度代码以及由结构模型代码ASTER和OpenFOAM耦合制成的高保真度代码具有自由表面的VoF流体动力学模型。水翼的机械特性突出了在水动力试验中加剧的结构差异。弯扭耦合引起尖端攻角的改变，从而导致产生的升力和变形产生明显差异。通过数值方法模拟了弯扭耦合和水动力性能。