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Asymptotic behavior of curvature of surface elements in isotropic turbulenceThe asymptotic behavior of the curvature of material elements in turbulence is investigated using Lagrangian velocity-gradient time series obtained from direct numerical simulations of isotropic turbulence. Several material-element ensembles of different initial curvatures and shapes are studied. It is found that, at long times, the (first five) moments of the logarithm of characteristic curvature and shape factor asymptote to values that are independent of the initial curvature or shape. This evidence strongly suggests that the asymptotic pdf's of the curvature and shape of material elements are stationary and independent of initial conditions. Irrespective of initial curvature or shape, the asymptotic shape of a material surface is cylindrical with a high probability.
Document ID
19910058208
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Girimaji, S. S.
(NASA Langley Research Center; A.S.&M., Inc. Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
July 1, 1991
Publication Information
Publication: Physics of Fluids A
Volume: 3
ISSN: 0899-8213
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
91A42831
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-88-0052
Distribution Limits
Public
Copyright
Other

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