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对NACA4412翼型低速绕流进行了定常/非定常数值计算。对流项及扩散项的空间离散分别采用Roe格式和二阶中心格式,时间方向采用了二阶精度的双时间步隐式方法求解,湍流模式采用了两方程SST k-ω模式。将定常/非定常数值计算结果与实验数据进行了对比,非定常计算显示出了翼型尾缘附近周期性脱落涡现象,尾迹流动区里非定常流动现象明显,时间平均的非定常计算结果与实验数据符合的更好。
NACA4412 airfoil low-speed flow around the steady / unsteady numerical calculations. The spatial dispersions of convection term and divergence term are solved by Roe scheme and second-order central scheme respectively. The second-order time step implicit method is adopted for solving the time-order problem. The turbulence model uses the two-equation SST k-ω model. The results of steady / unsteady numerical calculation are contrasted with the experimental data. Unsteady calculation shows the phenomenon of periodic shedding vortex near the trailing edge of the airfoil and the unsteady flow in the wakespace. The unsteady calculation results of time-averaged The experimental data is better.