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Incoherent turbulence structure in the near wake of a normal plate

Published online by Cambridge University Press:  21 April 2006

M. Kiya  and
M. Matsumura
M. Kiya
Affiliation:
Department of Mechanical Engineering, Hokkaido University, Sapporo, 060 Japan
M. Matsumura
Affiliation:
Department of Mechanical Engineering, Hokkaido University, Sapporo, 060 Japan
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Abstract

In this paper experimentally studied characteristics of various frequency components of incoherent velocity fluctuations in the near wake behind a thin normal plate immersed in a uniform flow are described. Measurements were made at a position 8 plate heights downstream of the plate where the wake had a marked periodicity, so that coherent vortices shed from the plate are expected to have a small dispersion in streamwise spacing, transverse location, strength and shape. Shearing stress associated with the incoherent fluctuations is mainly contributed by components with frequencies around half of the vortex-shedding frequency fs on one side of the wake. The ½fs frequency component appears to be caused by the spanwise locations of ribs, which are connected to the coherent vortices, being different from vortex to vortex. A probable spanwise arrangement of the ribs is suggested.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 190 , May 1988 , pp. 343 - 356
Copyright
© 1988 Cambridge University Press

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