Numerical simulation of multi-element airfoil in unsteady ground effect

Zhu Yixi; Lu Zhiliang; Guo Tongqing

doi:10.7638/kqdlxxb-2014.0048

ACTA AERODYNAMICA SINICA > 2015 > 33(6): 806-811. > DOI: 10.7638/kqdlxxb-2014.0048

Zhu Yixi, Lu Zhiliang, Guo Tongqing. Numerical simulation of multi-element airfoil in unsteady ground effect[J]. ACTA AERODYNAMICA SINICA, 2015, 33(6): 806-811. DOI: 10.7638/kqdlxxb-2014.0048

Citation:

Zhu Yixi, Lu Zhiliang, Guo Tongqing. Numerical simulation of multi-element airfoil in unsteady ground effect[J]. ACTA AERODYNAMICA SINICA, 2015, 33(6): 806-811. DOI: 10.7638/kqdlxxb-2014.0048

Citation:

Zhu Yixi, Lu Zhiliang, Guo Tongqing. Numerical simulation of multi-element airfoil in unsteady ground effect[J]. ACTA AERODYNAMICA SINICA, 2015, 33(6): 806-811. DOI: 10.7638/kqdlxxb-2014.0048

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Numerical simulation of multi-element airfoil in unsteady ground effect

Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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Received Date: June 03, 2014
Revised Date: August 20, 2014
Available Online: January 07, 2021

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Abstract

Abstract

The unsteady ground effect of a multi-element airfoil during its taking off and landing has been studied. For the airfoil's large displacement, a strategy that mesh around airfoil should be kept in rigid motion with the airfoil is proposed. Besides, a simple and practical mesh reconstruction method based on moving mesh has been adopted to preserve the grid quality. Furthermore, the Navier-Stokes equations in arbitrary Lagrangian-Eulerian (ALE) frame have been solved to simulate the unsteady flows around the airfoil close to the ground. Both NACA0012 and GAW-(1) two-element airfoil in uniform down have been computed out of ground effect, and the results are in agreement with calculations of the corresponding quasi-steady cases. As GAW-(1) two-element airfoil approaches the ground, the unsteady ground effect has been investigated. Computations indicate that the lift of the multielement airfoil decreases as it gets close to the ground. Besides, the results are compared with the quasi-steady (add the equivalent attack angle to airfoil's attack angle) ones, which show that unsteady ground effect is first less then greater than the quasi-steady one as the height between airfoil and ground decreases.
- Navier-Stokes equations,
- unsteady ground effect,
- arbitrary Lagrangian-Eulerian method,
- multi-element airfoil

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[1]	Angle G M Ⅱ, O'Hara M, Pertl F A, et al. Pitch stability analysis of an airfoil in ground effect[D]. Morgantown, WV:West Virginia Univ., 2009.
[2]	Justin Gross, Lance W Traub. Experimental and theoretical investigation of ground effect at low reynolds numbers[J]. Journal of Aircraft, 2012, 49(2):576-586.
[3]	Gratzer L B, Mahal A S. Ground effects in STOL operation[J]. Journal of Aircraft, 1971, 19(3):236-242.
[4]	[KG2.1mm]Ahmed M R, Takasaki T, Kohama Y. Aerodynamics of a NACA4412 airfoil in ground effect[J]. AIAA Journal, 2007, 45(1):37-47.
[5]	[KG2.1mm]Zhang Z, Zerihan Jonathan. Aerodynamics of a double-element wing in ground effect[J]. AIAA Journal, 2003, 41(6):1007-1016.
[6]	Xiao T, Daichin. The experimental study of aerodynamics and flow structures of a wing with Gurney flaps in ground effect[J]. Acta Aerodynamica Sinica, 2013, 31(5):572-578. (in Chinese)肖涛,代钦. Gurney襟翼对机翼地面效应气动特性和流动结构的影响实验研究[J].空气动力学学报, 2013, 31(5):572-578.
[7]	Qin X G, Liu P Q, Qu Q L. Numerical simulation on 3D multi-element wings in ground effect[J]. Acta Aeronuatica et Astronautica Sinica. 2011,32(2):257-264. (in Chinese)秦绪国,刘沛清,屈秋林,等.三维多段机翼地面效应数值模拟[J].航空学报, 2011, 32(2):257-264.
[8]	Ye-Hoon Im, Keun-Shik Chang. Unsteady Aerodynamics of a wing-in-ground-effect airfoil flying over a wavy wall[J]. Journal of Aircraft, 2000, 37(4):690-696.
[9]	Wu J, Shu C, Zhao N, et al. Fluid dynamics of flapping insect wing in ground effect[J]. Journal of Bionic Engineering, 2014, (11):52-60.
[10]	Wang Z Q, Bai J Q, Wang Y Y. Steady/unsteady numeric simulation of aircraft ground effect[J]. Science Technology and Engineering, 2012, 12(5):1073-1075. (in Chinese)王中清,白俊强,王元元.飞行器地面效应定常/非定常流场数值模拟[J].科学技术与工程, 2012, 12(5):1073-1075.
[11]	Guo T Q. Transonic unsteady aerodynamics and flutter computations for complex assemblies[D]. Nanjing University of Aeronautics and Astronautics, 2006. (in Chinese)郭同庆.复杂组合体跨音速非定常气动力和颤振计算[D].南京:南京航空航天大学, 2006.
[12]	Thomas P, Lombard K. Conservation law and its application to flow computations on moving grids[J]. AIAA Journal, 1979, 17:1030-1037.
[13]	Christopher L Rumseya, Susan X Y. Prediction of high lift:review of present CFD capability[J]. Progress in Aerospace Sciences, 2002, (38):145-180.
[14]	Ding L, Lu Z L, Guo T Q. An efficient dynamic mesh generation method for complex multi-block structured grid[J]. Advances in Applied Mathematics and Mechanics, 2014, 6(1):120-134.
[15]	Smith A M O. High lift aerodynamics[J]. Journal of Aircraft, 1975, 12(6):501-530.
[16]	Wentz W H. Development of a fowler flap system for a high performance general aviation airfoil[R]. NASA CR-2443, 1974.
[17]	Jahangirian A, Hadidoolabi M. Unstructured moving grids for implicit calculation of unsteady compressible viscous flows[J]. Int. J. Numer. Meth. Fluids, 2005, 47:1107-1113.
[18]	Blazek J. Computational fluid dynamic:principles and applications[M]. Elsevier, 2001.
[19]	Lu Z L. Generation of dynamic grids and computation of unsteady transonic flows around assemblies[J]. Chinese Journal of Aeronautics, 2001, 14(1):1-5.

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