Comparative Studies of Numerical Methods for Evaluating Aerodynamic Characteristics of Two-dimensional Airfoil at Low Reynolds Numbers
Comparative Studies of Numerical Methods for Evaluating Aerodynamic Characteristics of Two-dimensional Airfoil at Low Reynolds Numbers
复制标题
低雷诺数二维翼型气动特性数值计算方法比较研究
DOI：
10.1080/10618562.2016.1274398
复制
发表时间：
2017
影响因子：
1.3
通讯作者：
and K. Fujii
中科院分区：
文献类型：
--
作者：
D. Lee;T.Nonomura;A. Oyama;and K. Fujii
本文研究了低雷诺数下几种数值方法的气动性能的可预测性及其对翼型几何形状的依赖性。采用Baldwin-Lomax（2-D RANS（BL））和Spalart-Allmaras（2-D RANS（SA））湍流模型进行了三维大涡模拟（3-D LES）、二维层流模拟（2-D Lam）和雷诺平均Navier-Stokes模拟。虽然三维LES、二维Lam和二维RANS（SA）的结果在升力和阻力特性方面几乎没有差异，但在分离点和再附着点的可预测性方面却存在显著差异。2-D Lam的预测升力、分离和再附着点与3-D LES的预测升力、分离和再附着点在性质上相似，除了大迎角时发生大规模分离。二维RANS（SA）对升力点和分离点有很好的预测性，但不能准确地估计再附着点。二维RANS（BL）不能准确预测分离点，导致升力可预测性差。这些特性与翼型几何形状无关。结果表明，在低雷诺数条件下，无需任何湍流模型的二维Lam模型可以用来定性地估算翼型的气动特性。
This study investigates the predictability of the aerodynamic performance of some numerical methods at low Reynolds numbers and their dependency on the geometric shape of airfoil. We conducted three-dimensional large-eddy simulations (3-D LES), two-dimensional laminar simulations (2-D Lam), and Reynolds-averaged Navier–Stokes simulations with Baldwin–Lomax (2-D RANS(BL)) and Spalart–Allmaras (2-D RANS(SA)) turbulence models. Although there is little discrepancy between the 3-D LES, 2-D Lam, and 2-D RANS(SA) results in terms of the lift and drag characteristics, significant differences are observed in the predictability of the separation and reattachment points. The predicted lift, separation, and reattachment points of the 2-D Lam are qualitatively similar to those of the 3-D LES, except for high angles of attack at which a massive separation occurs. The 2-D RANS(SA) shows good predictability of the lift and separation points, but it does not estimate reattachment points accurately. The 2-D RANS(BL) fails to predict the precise separation points, which results in a poor lift predictability. These characteristics appear regardless of the airfoil geometry shapes. The results suggest that a 2-D Lam without any turbulence models can be used to estimate qualitative airfoil aerodynamic characteristics at the low Reynolds numbers.