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Numerical simulation of laminar-turbulent transition in a spatially-developing flat plate wakeLaminar-turbulent transition of an incompressible flat-plate wake is investigated by direct numerical integration of the Navier-Stokes equations. For the numerical integration, a combination of finite-difference and spectral methods along with an ADI/Crank-Nicolson/Adams-Bashforth time integration scheme is employed. Subject to 2D forcing, the wake exhibited a rapidly-growing fundamental disturbance that quickly saturated. This saturation was due partly to the stabilizing effect of the mean flow distortion. Downstream of the saturation point, disturbance energy was concentrated in the fundamental disturbance, the second harmonic, and the mean flow distortion component. At large amplitude levels, a Karman vortex street formed. Variations in the 2D forcing level did not alter the qualitative behavior of the disturbances. Simulations of 3D breakdown indicates that the presence of large-amplitude, 2D disturbances tends to initially suppress small-amplitude 3D disturbance growth. Following this initial suppression, a resumption of 3D growth is observed that may have been due to a secondary instability mechanism. For high levels of 3D disturbance energy, lambda-shaped vortical structures formed between adjacent Karman vortices.
Document ID
19930064116
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dratler, D. I.
(NASA Headquarters Washington, DC United States)
Fasel, H. F.
(Arizona Univ. Tucson, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 93-2911
Meeting Information
Meeting: AIAA, Fluid Dynamics Conference
Location: Orlando, FL
Country: United States
Start Date: July 6, 1993
End Date: July 9, 1993
Sponsors: AIAA
Accession Number
93A48113
Funding Number(s)
CONTRACT_GRANT: NGT-50074
CONTRACT_GRANT: AF-AFOSR-85-0146
Distribution Limits
Public
Copyright
Other

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