基于非定常边界元法的振动翼水动力性能研究

Research on hydrodynamic performance of oscillated hydrofoils using unsteady boundary element method

讨论了非定常边界元法的构建过程、数值模型、程序结构,建立了可以计及自由面影响的振动翼水动力性能计算模型;并采用该法在时域中进行了计算和研究.计算中采用了时变的尾涡面和时步迭代法.基于格林定理在边界面上布置Rankine源和偶极子,并采用时域方法求解自由面问题.经过数值计算结果与试验数据的对比,验证了计算模型的可行性和可靠性,表明该方法是研究振动翼非定常水动力性能的有效算法.

Unsteady boundary element method （BEM） was employed to research the hydrodynamic performance of oscillated hydrofoils which in the condition that free surface was considered. The construction process of unsteady BEM, numerical calculation model, and structure of computational pro- gram was discussed. The time-dependent trailing vortex sheet and the time-stepping scheme was used. Based on Green＇s theorem, the Rankine Sources and dipoles are placed on boundary surfaces, and a time domain numerical model was constructed to resolve the free surface problem. Feasibility and reliability of computation model was demonstrated by the comparison between numerical results and ex- perimental data. It is proven that this method is an effective approach to research unsteady hydrodynamic performance of oscillating hydrofoil.