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Flow formed by spanwise gaps between roughness elementsMeasurements of the three mean velocity components and the three Reynolds shear stresses were made in the region downstream of gaps between wall-mounted roughness elements of square cross section and high aspect ratio in a thick turbulent boundary layer. The effect of small and large gaps was studied in a wind tunnel at a Reynolds number of 3600, based on obstacle height and free-stream velocity. The small gap produces retardation of the gap flow as with a two-dimensional roughness element, but a definite interaction between gap and wake flows is observed. The interaction is more intense for the large gap than for the small. Both gaps generate a secondary crossflow which moves fluid away from the centerline in the wall region and toward the centerline in the outer (y greater than 1.5H) region.
Document ID
19860027235
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Logan, E.
(Arizona State Univ. Tempe, AZ, United States)
Lin, S. H.
(Arizona State Univ. Tempe, AZ, United States)
Islam, O.
(Arizona State University Tempe, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1985
Publication Information
Publication: ASME, Transactions, Journal of Fluids Engineering
Volume: 107
ISSN: 0098-2202
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
86A11973
Distribution Limits
Public
Copyright
Other

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