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Detached Eddy Simulation of Complex Separation Flows Over a Modern Fighter Model at High Angle of Attack

Part of: Turbulence Numerical analysis: Ordinary differential equations Basic methods in fluid mechanics

Published online by Cambridge University Press:  31 October 2017

Yang Zhang ,
Laiping Zhang ,
Xin He ,
Xiaogang Deng  and
Haisheng Sun
Yang Zhang*
Affiliation:
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China Low Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
Laiping Zhang*
Affiliation:
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China
Xin He*
Affiliation:
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China
Xiaogang Deng*
Affiliation:
National University of Defense Technology, Changsha, Hunan 410073, China
Haisheng Sun*
Affiliation:
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China Low Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
*
*Corresponding author. Email addresses:[email protected](Y. Zhang), [email protected](L. P. Zhang), [email protected](X. He), [email protected](X. G. Deng), [email protected](H. S. Sun)
*Corresponding author. Email addresses:[email protected](Y. Zhang), [email protected](L. P. Zhang), [email protected](X. He), [email protected](X. G. Deng), [email protected](H. S. Sun)
*Corresponding author. Email addresses:[email protected](Y. Zhang), [email protected](L. P. Zhang), [email protected](X. He), [email protected](X. G. Deng), [email protected](H. S. Sun)
*Corresponding author. Email addresses:[email protected](Y. Zhang), [email protected](L. P. Zhang), [email protected](X. He), [email protected](X. G. Deng), [email protected](H. S. Sun)
*Corresponding author. Email addresses:[email protected](Y. Zhang), [email protected](L. P. Zhang), [email protected](X. He), [email protected](X. G. Deng), [email protected](H. S. Sun)
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Abstract

This paper presents the simulation of complex separation flows over a modern fighter model at high angle of attack by using an unstructured/hybrid grid based Detached Eddy Simulation (DES) solver with an adaptive dissipation second-order hybrid scheme. Simulation results, including the complex vortex structures, as well as vortex breakdown phenomenon and the overall aerodynamic performance, are analyzed and compared with experimental data and unsteady Reynolds-Averaged Navier-Stokes (URANS) results, which indicates that with the DES solver, clearer vortical flow structures are captured and more accurate aerodynamic coefficients are obtained. The unsteady properties of DES flow field are investigated in detail by correlation coefficient analysis, power spectral density (PSD) analysis and proper orthogonal decomposition (POD) analysis, which indicates that the spiral motion of the primary vortex on the leeward side of the aircraft model is highly nonlinear and dominates the flow field. Through the comparisons of flow topology and pressure distributions with URANS results, the reason why higher and more accurate lift can be obtained by DES is discussed. Overall, these results show the potential capability of present DES solver in industrial applications.

Keywords

Detached eddy simulationhybrid gridadaptive dissipationseparation flowhigh angle of attack

MSC classification

Secondary: 76F99: None of the above, but in this section 76M12: Finite volume methods 65L80: Methods for differential-algebraic equations
Type
Research Article
Information
Communications in Computational Physics , Volume 22 , Issue 5 , November 2017 , pp. 1309 - 1332
Copyright
Copyright © Global-Science Press 2017 

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