Hydrodynamic response of a pitching elastic hydrofoil in the wake of a circular body.

A hydrofoil with a classic cylinder–hydrofoil structure is adopted for study in this paper. The hydrofoil is invented by National Advisory Committee for Aeronautics (NACA) and so-called NACA0012.The hydrofoil is placed in an unsteady turbulent environment by positioning a cylinder in front of the hydrofoil. The simulation includes a solid stress model to calculate the hydrofoil's elastic deformation. Large-eddy simulation is used to simulate the effects of different materials on the hydrodynamic performance and noise characteristics. Researching the hydrodynamic performance and acoustic radiation characteristics of the pitching hydrofoil in a turbulent flow provides a reference basis for its design and manufacture. It was found that different material properties have limited effects on the hydrodynamic performance of pitching hydrofoils, and the generated lift is similar for each case. An analysis of stress changes shows that the stress increases with increasing elastic modulus and as the fixed rod is approached. In contrast, the displacement decreases as the elastic modulus increases. The displacement increases with the distance from the fixed rod. In addition, the noise component results show that thickness noise dominates, and an elastic material hydrofoil has better noise performance. [ABSTRACT FROM AUTHOR]