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Study of High Lift ConfigurationsThis project focus on the implementation of the Warren-Hassan transition / turbulence model (Journal of Aircraft, Vol. 35, No. 5) into the NASA code CFL3D and its testing for multi-element airfoils in landing configuration at different angles of attack. The Warren-Hassan transition model solves an evolution equation for a kinetic energy characteristic of non-turbulent fluctuations. This is combined with an empirical estimate of the frequency of the most amplified first-mode disturbance to yield an expression for an eddy viscosity characteristic of non-turbulent fluctuations. This is combined with the k - zeta model for fully turbulent flow to yield a unified approach capable of predicting both transition onset and extent. Blending of the non-turbulent and turbulent components of the model is accomplished by an intermittency function based on the work of Dhawan and Narasimha (Journal of Fluid Mechanics, Vol. 3, No. 4).
Document ID
20000024855
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Edward, Jack R.
(North Carolina State Univ. Raleigh, NC United States)
Hassan, Hassan A.
(North Carolina State Univ. Raleigh, NC United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Aircraft Design, Testing And Performance
Funding Number(s)
CONTRACT_GRANT: NAG1-1991
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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