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Turbulence structures of wall-bounded shear flows found using DNS data

Published online by Cambridge University Press:  25 February 1998

M. S. CHONG ,
J. SORIA ,
A. E. PERRY ,
J. CHACIN ,
B. J. CANTWELL  and
Y. NA
M. S. CHONG
Affiliation:
Department of Mechanical and Manufacturing Engineering, University of Melbourne, Parkville, VIC 3052, Australia
J. SORIA
Affiliation:
Department of Mechanical Engineering, Monash University, Clayton, VIC 3168, Australia
A. E. PERRY
Affiliation:
Department of Mechanical and Manufacturing Engineering, University of Melbourne, Parkville, VIC 3052, Australia
J. CHACIN
Affiliation:
Department of Mechanical Engineering, Stanford University, CA 94305, USA
B. J. CANTWELL
Affiliation:
Department of Aeronautics and Astronautics, Stanford University, CA 94305, USA
Y. NA
Affiliation:
Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, IL 61801, USA
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Abstract

This work extends the study of the structure of wall-bounded flows using the topological properties of eddying motions as developed by Chong et al. (1990), Soria et al. (1992, 1994), and as recently extended by Blackburn et al. (1996) and Chacin et al. (1996). In these works, regions of flow which are focal in nature are identified by being enclosed by an isosurface of a positive small value of the discriminant of the velocity gradient tensor. These regions resemble the attached vortex loops suggested first by Theodorsen (1955). Such loops are incorporated in the attached-eddy model versions of Perry & Chong (1982), Perry et al. (1986), and Perry & Marusic (1995), which are extensions of a model first formulated by Townsend (1976). The direct numerical simulation (DNS) data of wall-bounded flows studied here are from the zero-pressure-gradient flow of Spalart (1988) and the boundary layer with separation and reattachment of Na & Moin (1996). The flow structures are examined from the viewpoint of the attached eddy hypothesis.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 357 , 25 February 1998 , pp. 225 - 247
Copyright
© 1998 Cambridge University Press

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