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The structure of the vorticity field in homogeneous turbulent flowsThe structures of the vorticity fields in several homogeneous irrotational straining flows and a homogeneous turbulent shear flow were examined using a database generated by direct numerical simulation of the unsteady Navier-Stokes equations. In all cases, strong evidence was found for the presence of coherent vortical structures. The initially isotropic vorticity fields were rapidly affected by imposed mean strain and the rotational component of mean shear and developed accordingly. In the homogeneous turbulent shear-flow cases, the roll-up of mean vorticity into characteristic hairpin vortices was clearly observed, supporting the view that hairpin vortices are an important vortical structure in all turbulent shear flows; the absence of mean shear in the homogeneous irrotational straining flows precludes the presence of hairpin-like vortices.
Document ID
19870049980
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rogers, Michael M.
(NASA Ames Research Center Moffett Field, CA, United States)
Moin, Parviz
(NASA Ames Research Center Moffett Field; Stanford University, CA, United States)
Date Acquired
August 13, 2013
Publication Date
March 1, 1987
Publication Information
Publication: Journal of Fluid Mechanics
Volume: 176
ISSN: 0022-1120
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
87A37254
Distribution Limits
Public
Copyright
Other

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