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Turbulence‐producing eddies in the viscous wall region
Author(s) -
Lyons S. L.,
Hanratty T. J.,
McLaughlin J. B.
Publication year - 1989
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690351207
Subject(s) - eddy , turbulence , mechanics , quadrant (abdomen) , reynolds stress , reynolds number , physics , plane (geometry) , turbulence kinetic energy , flow (mathematics) , geometry , mathematics , medicine , pathology
A computer simulation of turbulent flow in a channel is used to detect flow patterns related to the production of Reynolds stress. It is found that quadrant 2 and quadrant 4 events possess a streaky structure in the viscous wall region and that these events can be best understood by examining the velocity field in the y ‐ z plane. Large turbulence production in the viscous wall region is found to occur in updrafts and downdrafts associated with closed eddies. These eddies, on average, have a spanwise dimension of 50 wall units and a streamwise dimension of 400–450 wall units. They are often seen to originate from small attached eddies at the wall.