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Three-dimensional separation and reattachmentThe separation of three dimensional turbulent boundary layers from the lee of flight vehicles at high angles of attack is investigated. The separation results in dominant, large scale, coiled vortex motions that pass along the body in the general direction of the free stream. In all cases of three dimensional flow separation and reattachment, the assumption of continuous vector fields of skin friction lines and external flow streamlines, coupled with simple laws of topology, provides a flow grammar whose elemental constituents are the singular points: the nodes, spiral nodes (foci), and saddles. The phenomenon of three dimensional separation may be construed as either a local or a global event, depending on whether the skin friction line that becomes a line of separation originates at a node or a saddle point.
Document ID
19820016291
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Peake, D. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Tobak, M.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
March 1, 1982
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-84221
A-8845
NAS 1.15:84221
Accession Number
82N24167
Funding Number(s)
PROJECT: RTOP 505-31-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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