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Probing structures in channel flow through SO(3) and SO(2) decomposition

Published online by Cambridge University Press:  15 February 2002

LUCA BIFERALE ,
DETLEF LOHSE ,
IRENE M. MAZZITELLI  and
FEDERICO TOSCHI
LUCA BIFERALE
Affiliation:
Department of Physics, University Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy INFM, Unitá di Tor Vergata, Roma, Italy
DETLEF LOHSE
Affiliation:
Department of Applied Physics and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
IRENE M. MAZZITELLI
Affiliation:
Department of Applied Physics and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
FEDERICO TOSCHI
Affiliation:
Department of Applied Physics and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands INFM, Unitá di Tor Vergata, Roma, Italy
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Abstract

SO(3) and SO(2) decompositions of numerical channel flow turbulence are performed. The decompositions are used to probe, characterize, and quantify anisotropic structures in the flow. Close to the wall, the anisotropic modes are dominant and reveal the flow structures. The dominance of the (j, m) = (2, 1) mode of the SO(3) decomposition in the buffer layer is associated with hairpin vortices. The SO(2) decomposition in planes parallel to the walls allows us also to access the regions very close to the wall. In those regions we have found that the strong enhancement of intermittency can be explained in terms of streaklike structures and their signatures in the m = 2 and m = 4 modes of the SO(2) decomposition.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 452 , 10 February 2002 , pp. 39 - 59
Copyright
© 2002 Cambridge University Press

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