Direct Numerical Simulations on the three-dimensional wake transition of flows over NACA0012 airfoil at Re = 1000

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-01-01 DOI:10.1177/17568293211055656

T. Kouser, Y. Xiong, Dan Yang, Sai Peng

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引用次数: 6

Abstract

For micro air vehicles (MAV), the precise prediction of aerodynamic force plays an important role. The aerodynamic force of a comparative low Reynold number (Re) vehicle tends to be affected by the different flow modes. In this paper, the aerodynamic performance of a three-dimensional NACA0012 airfoil is studied numerically. A range of angles of attack (α) 0°−25° and Reynolds number 1000 is considered. Mean and fluctuating coefficients of aerodynamic forces around NACA0012 airfoil are analyzed for different wake modes. The difference of aerodynamic forces between two and three-dimensional simulations are compared. The results show that the wake remains steady two-dimensional for lower angles of attack. At α = 9°, Von Karman vortex pattern is noticed. Flow transition to three-dimensional as the angle of attack increases from α = 13°. 3D wake is found to be stable with parallel shedding mode for 14°-17°. However, these modes become finer with the gradual increase in angle of incidence. While, wake loses its three-dimensional stability to chaotic with gradual increment in angle of attack afterwards.

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Re = 1000时NACA0012翼型三维尾迹转捩的直接数值模拟

对于微型飞行器(MAV)来说，精确的气动力预测具有重要的意义。相对低雷诺数飞行器的气动力往往受到不同流动模式的影响。本文对三维NACA0012翼型的气动性能进行了数值研究。考虑攻角(α)为0°~ 25°，雷诺数为1000。分析了不同尾流模式下NACA0012翼型的平均气动系数和波动气动系数。比较了二维仿真和三维仿真的气动力差异。结果表明，在较低迎角时，尾迹保持二维稳定。在α = 9°处，观察到Von Karman涡型。从α = 13°开始，随着迎角的增大，流动向三维过渡。三维尾迹在14°~ 17°范围内具有稳定的平行脱落模式。随着入射角的逐渐增大，这些模态逐渐变细。随着迎角的逐渐增大，尾迹逐渐失去三维稳定性，进入混沌状态。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.