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论文:2012,Vol:30,Issue(6):830-835 |
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引用本文: |
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刘方良, 韩忠华, 宋文萍, 张坤. 含层流分离泡的粘性绕流精确数值模拟方法研究[J]. 西北工业大学 |
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Liu Fangliang, Han Zhonghua, Song Wenping, Zhang Kun. RANS Simulation with Transition Prediction Method on Airfoil Flows with Laminar Separation Bubbles[J]. Northwestern polytechnical university |
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含层流分离泡的粘性绕流精确数值模拟方法研究 |
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刘方良, 韩忠华, 宋文萍, 张坤 |
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西北工业大学 翼型叶栅空气动力学国防科技重点实验室, 陕西 西安 710072 |
摘要: |
高精度CFD求解器是翼型设计的基础,而翼型流动转捩的准确预测是提高数值模拟精度的关键之一。eN方法是比较可靠的且可应用于翼型设计的转捩判断方法,但目前国内耦合eN转捩预测与二维雷诺平均N-S(RANS)方程求解器的研究仍需要通过求解层流边界层方程为转捩判断提供所需的边界层信息。这种方法不能处理含层流分离泡的流动。为解决上述问题,文章发展了一种直接求解RANS方程为转捩判断提供高精度的边界层解的方法,耦合基于线性稳定性理论的eN转捩判断方法实现了含层流分离泡流动的转捩点自动判断。采用文中方法对含层流分离泡的翼型绕流进行了数值模拟,转捩预测位置与实验值吻合较好,气动力计算精度得到了提高,验证了该方法的有效性。 |
关键词:
RANS方程
eN转捩判断方法
线性稳定性理论
边界层转捩
层流分离泡
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RANS Simulation with Transition Prediction Method on Airfoil Flows with Laminar Separation Bubbles |
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Liu Fangliang, Han Zhonghua, Song Wenping, Zhang Kun |
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National Key Laboratory of Science and Technology on Aerodynamic Design and Research, Northwestern Polytechnical University, Xi'an 710072, China |
Abstract: |
In this paper,the transition prediction model of e N method based on linear stability theory is introducedinto the calculation of the two dimensional Reynolds-Averaged Navier-Stokes (RANS) equations in order to improvethe accuracy of numerical simulation of flow around airfoil,especially for cases involving laminar separation bub-bles. The detailed information of the boundary layer used for linear stability analysis is obtained from the RANS sol-ver. e N method based on linear stability theory is used to analyze this information and determine the transition posi-tion which is then returned into the RANS solver. The above steps are repeated until the transition position changesinsignificantly. So it is an automatic progress of transition prediction. Numerical simulation results of flows respec-tively around S809 airfoil and NACA 66 3 -018 airfoil,presented in Figs. 3 through 9,Figs. 11 through 14 and Ta-bles 1 and 2,and their analysis confirm preliminarily indeed the validity of our method of calculation,particularlyfor the cases involving laminar separation bubbles. |
Key words:
airfoils
algorithms
boundary conditions
laminar boundary layer
calculations
computer simulation
computer software
flow fields
flowcharting
linear stability analysis
mathematical models
NavierStokes equations
two dimensional
unmanned aerial vehicles(UAV)
stability;boundary layer tran-sition
e N transition prediction method
laminar separation bubble
linear stability theory
Reynolds-Averaged Navier Stokes(RANS) equations
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收稿日期: 2011-12-08
修回日期:
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DOI: |
基金项目: 国家高技术研究发展计划(2012AA951301)资助 |
通讯作者:
Email: |
作者简介: 刘方良(1988-),女,西北工业大学硕士研究生,主要从事计算流体力学的研究。
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参考文献: |
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