Turbulence‐producing eddies in the viscous wall region | Zendy

Lyons S. L. | Zendy; Hanratty T. J. | Zendy; McLaughlin J. B. | Zendy

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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.

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