Global stability analysis of attached or separated flows over a NACA0012 airfoil

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2 Citations (Scopus)

Abstract

The stability of a non-parallel flowfield over an airfoil has been investigated by applying a two-dimensional global (non-parallel) linear stability analysis. In this study, Chiba's method, which is a numerical method for the global linear stability analysis, was improved in order to study the stability of the time-averaged flowfield of CFD results. In a laminar separation bubble formed on the airfoil, a sequence of vortices is experimentally observed, which is generated by Kelvin-Helmholtz instability. By applying the stability analysis, we can examine the mode such as an oscillatory phenomenon that is generated by the instability of the flowfield. At higher angles of attack, a separated flow is observed at the leading edge of the airfoil, which corresponds to the stall condition of the airfoil. The results of the global stability analysis at high angles of attack demonstrate the mode which causes the separation at the leading edge of the airfoil. In this paper, the mode of Kelvin-Helmholtz instability and the mode which causes the stall condition of flowfield are presented.

Original languageEnglish
Title of host publicationCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
Pages15798-15814
Number of pages17
Publication statusPublished - 2006 Dec 1
Event44th AIAA Aerospace Sciences Meeting 2006 - Reno, NV, United States
Duration: 2006 Jan 92006 Jan 12

Publication series

NameCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
Volume21

Conference

Conference44th AIAA Aerospace Sciences Meeting 2006
CountryUnited States
CityReno, NV
Period06/1/906/1/12

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ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Tezuka, A. (2006). Global stability analysis of attached or separated flows over a NACA0012 airfoil. In Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting (pp. 15798-15814). (Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting; Vol. 21).