A simplified e” method for separated boundary layers

Paolo Dini, Michael S. Selig, Mark David Maughmer

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

An existing transition prediction method for attached, two-dimensional, incompressible boundary layers based on linear stability analysis is extended to separated, two-dimensional, incompressible boundary layers such as those found in laminar (transitional) separation bubbles. It is shown why the present method, which tracks the growth of disturbances at many different frequencies, is more accurate than the so-called envelope methods. Reliance on a data base of pre-calculated stability characteristics of known velocity profiles makes this method much faster than traditional stability calculations of similar accuracy. The Falkner-Skan self-similar profiles are used for attached flow and a new, very general family of profiles is used for separated flow. Comparisons with measured transition locations inside the bubble show good agreement over the range of chord Reynolds numbers and airfoil angles of attack of interest.

Original languageEnglish (US)
StatePublished - Jan 1 1991
Event9th Applied Aerodynamics Conference, 1991 - Baltimore, United States
Duration: Sep 23 1991Sep 25 1991

Other

Other9th Applied Aerodynamics Conference, 1991
CountryUnited States
CityBaltimore
Period9/23/919/25/91

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Boundary layers
Linear stability analysis
Angle of attack
Airfoils
Reynolds number

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Aerospace Engineering

Cite this

Dini, P., Selig, M. S., & Maughmer, M. D. (1991). A simplified e” method for separated boundary layers. Paper presented at 9th Applied Aerodynamics Conference, 1991, Baltimore, United States.
Dini, Paolo ; Selig, Michael S. ; Maughmer, Mark David. / A simplified e” method for separated boundary layers. Paper presented at 9th Applied Aerodynamics Conference, 1991, Baltimore, United States.
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Dini, P, Selig, MS & Maughmer, MD 1991, 'A simplified e” method for separated boundary layers' Paper presented at 9th Applied Aerodynamics Conference, 1991, Baltimore, United States, 9/23/91 - 9/25/91, .

A simplified e” method for separated boundary layers. / Dini, Paolo; Selig, Michael S.; Maughmer, Mark David.

1991. Paper presented at 9th Applied Aerodynamics Conference, 1991, Baltimore, United States.

Research output: Contribution to conferencePaper

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N2 - An existing transition prediction method for attached, two-dimensional, incompressible boundary layers based on linear stability analysis is extended to separated, two-dimensional, incompressible boundary layers such as those found in laminar (transitional) separation bubbles. It is shown why the present method, which tracks the growth of disturbances at many different frequencies, is more accurate than the so-called envelope methods. Reliance on a data base of pre-calculated stability characteristics of known velocity profiles makes this method much faster than traditional stability calculations of similar accuracy. The Falkner-Skan self-similar profiles are used for attached flow and a new, very general family of profiles is used for separated flow. Comparisons with measured transition locations inside the bubble show good agreement over the range of chord Reynolds numbers and airfoil angles of attack of interest.

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Dini P, Selig MS, Maughmer MD. A simplified e” method for separated boundary layers. 1991. Paper presented at 9th Applied Aerodynamics Conference, 1991, Baltimore, United States.