, 44:21 | Cite as

Negative lift characteristics of NACA 0012 aerofoil at low Reynolds numbers

  • C Pranesh
  • M SivapragasamEmail author
  • M D Deshpande
  • H K Narahari


Numerical investigations on the flow over NACA 0012 aerofoil are carried out to provide better understanding of the unusual lift characteristics exhibited by this aerofoil at low Reynolds numbers. Computations are carried out at Re = 10,000–100,000, for different values of angles of attack and freestream turbulence intensity. There exists a narrow range of these parameters where the net circulation around this symmetrical aerofoil is negative, leading to the generation of negative lift at positive angles of attack. Different flow regimes are identified and physical explanations are given for this unusual behaviour of negative lift, and the influence of different flow parameters is discussed.


NACA 0012 aerofoil low-Reynolds-number flows flow separation transition laminar separation bubble negative lift 


  1. 1.
    Mueller T J and Batill S M 1982 Experimental studies of separation on a two-dimensional airfoil at low Reynolds numbers. AIAA J. 20: 457–463CrossRefGoogle Scholar
  2. 2.
    Ohtake T, Nakae Y and Motohashi T 2007 Nonlinearity of the aerodynamic characteristics of NACA0012 aerofoil at low Reynolds numbers. J. Jpn. Soc. Aeronaut. Space Sci. 55: 439–445Google Scholar
  3. 3.
    Tank J, Smith L and Spedding G R 2017 On the possibility (or lack thereof) of agreement between experiment and computation of flows over wings at moderate Reynolds number. Interface Focus 7: 1–15Google Scholar
  4. 4.
    Yonemoto K, Takato K, Ochi H and Fujie S 2008 Kutta condition violation in two-dimensional NACA0012 airfoil at low Reynolds number. AIAA Paper 2008-6399 Google Scholar
  5. 5.
    Lee D, Nonomura T, Oyama A and Fujii K 2014 Comparison of numerical methods evaluating airfoil aerodynamic characteristics at low Reynolds number. J. Aircr. 52: 296–306CrossRefGoogle Scholar
  6. 6.
    Menter F R, Langtry R B, Likki S R, Suzen Y B, Huang P G and Völker S 2006 A correlation-based transition model using local variables—part I: model formulation. J. Turbomach. 128: 413–422CrossRefGoogle Scholar
  7. 7.
    Langtry R B, Menter F R, Likki S R, Suzen Y B, Huang P G and Völker S 2006 A correlation-based transition model using local variables—part II: test cases and industrial applications. J. Turbomach. 128: 423–434CrossRefGoogle Scholar
  8. 8.
    Counsil J N and Boulama K G 2013 Low-Reynolds-number aerodynamic performances of the NACA 0012 and Selig–Donovan 7003 airfoils. J. Aircr. 50: 204–216CrossRefGoogle Scholar
  9. 9.
    Chen Z J, Qin N and Nowakowski A F 2013 Three-dimensional laminar-separation bubble on a cambered thin wing at low Reynolds numbers. J. Aircr. 50: 152–163CrossRefGoogle Scholar
  10. 10.
    Selig M S, Guglielmo J F, Broern A P and Giguere P 1996 Experiments on airfoils at low Reynolds numbers. AIAA Paper 96-0062 Google Scholar

Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Automotive and Aeronautical EngineeringM S Ramaiah University of Applied SciencesBengaluruIndia

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