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Performance of a Modified DDES for the Near Stall Flow Past a NACA0015 Airfoil

  • Jian Liu
  • Wenqing Zhu
  • Zhixiang XiaoEmail author
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 143)

Abstract

A modification of DDES with adaptive coefficient CDES (DDES-AC) is proposed to deal with the delay transition from RANS to LES in the stall flows over a NACA0015 airfoil. The coefficient CDES is adaptive with the flow patterns, quasi-2D shear layer or 3D full developed separation, which helps to reduce the eddy viscosity in the separated shear layer. The performance of DDES-AC is validated by computing the flows over a NACA005 airfoil with mild trailing edge separation and during dynamic stall. It is found that the “grey area” in the original DDES is exacerbated in the simulation of dynamic stall. The DDES-AC is effective in accelerating the transition from RANS to LES and alleviating the “grey area” to some extent.

Keywords

DDES Adaptive coefficient Grey area Mild separation Dynamic stall 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 11772174 and No. 91852113).

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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.School of Aerospace EngineeringTsinghua UniversityBeijingChina
  2. 2.China Aerodynamics Research and Development CenterMianyangChina

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