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The effects of turbulence on the mean flow past two-dimensional rectangular cylinders

Published online by Cambridge University Press:  20 April 2006

Yasuharu Nakamura  and
Yuji Ohya
Yasuharu Nakamura
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga, 816, Japan
Yuji Ohya
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga, 816, Japan
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Abstract

There are two main effects of turbulence on the mean flow past rectangular cylinders, just as found earlier for square rods. Small-scale turbulence increases the growth rate of the separated shear layers through increased mixing. Large-scale turbulence weakens regular vortex shedding by reducing spanwise correlation. The consequences of increased mixing and weakened regular vortex shedding depend on the depth-to-height ratio of a rectangular cylinder. In particular, the mean base pressure of a rectangular cylinder can be varied significantly by both the scale and intensity of turbulence.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 149 , December 1984 , pp. 255 - 273
Copyright
© 1984 Cambridge University Press

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