翼型波浪水面巡航地面效应数值模拟

数值求解非定常不可压缩流动的雷诺平均N-S(Navier-Stokes)方程和标准k-ε湍流模型,用VOR(Volume Of Fluid)方法模拟波浪水面,模拟了NACA2410翼型在波浪水面上方飞行的流场.研究了余弦波浪水面的生成方法,选取合适的计算网格和时间步长,避免了在生成规则余弦波浪水面时由于数值耗散使波面形状衰减.比较了固壁波浪与水面波浪计算结果的差异,发现固壁波浪的结果更接近余弦曲线分布.研究了波浪等级对翼型气动性能的影响,分析计算结果发现:在规则的余弦水面波浪上方飞行,翼型气动力呈现周期性,给出了一个周期内气动力的变化过程,以及波长和波幅对气动力平均值和波动幅度的影响规律.

Numerical simulation on aerodynamics of airfoil flying over wavy water surface

Aerodynamic characteristics of an airfoil NACA2410 in flight being close to wavy water surface are investigated numerically. The Reynold average Navier-Stokes(RANS) equation of unsteady incompressible flow, the standard k-ε turbulence model and volume of fluid(VOF) method were solved. Appropriate mesh and time step were used to avoid the distortion of regular cosine wavy surface. The difference of the solid wall of water waves and water surface wave was compared. The results of the solid wall are closer to the cosine curve distribution. The aerodynamic forces of the airfoil are periodic when it flies over cosine-shaped water surface. The variation of the aerodynamic forces in one period is presented. The effect of wavelength and wave amplitude on mean and amplitude values of aerodynamic forces is provided.