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The Effect of Strain Rate on the Evolution of Plane Wakes Subjected to Irrotational StrainsDirect numerical simulations of time-evolving turbulent plane wakes developing in the presence of irrotational plane strain applied at three different strain rates have been generated. The strain geometry is such that the flow is compressed in the streamwise direction and expanded in the cross-stream direction with the spanwise direction being unstrained. This geometry is the temporally evolving analogue of a spatially evolving wake in an adverse pressure gradient. A pseudospectral numerical method with up to 16 million modes is used to solve the equations in a reference frame moving with the irrotational strain. The initial condition for each simulation is taken from a previous turbulent self-similar plane wake direct numerical simulation at a velocity deficit Reynolds number, Re, of about 2,000. Although the evolutions of many statistics are nearly collapsed when plotted against total strain, there are some differences owing to the different strain rate histories. The impact of strain-rate on the wake spreading rate, the peak velocity deficit, the Reynolds stress profiles, and the flow structure is examined.
Document ID
20020035536
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Rogers, Michael M.
(NASA Ames Research Center Moffett Field, CA United States)
Merriam, Marshal
Date Acquired
August 20, 2013
Publication Date
January 1, 1996
Subject Category
Structural Mechanics
Meeting Information
Meeting: DFD96 Meeting of the American Physical Society
Location: Syracuse, NY
Country: United States
Start Date: November 24, 1996
End Date: November 26, 1996
Sponsors: American Physical Society
Funding Number(s)
PROJECT: RTOP 505-59-53
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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