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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
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga, 816, Japan
Yuji Ohya
Affiliation:
Research Institute for Applied Mechanics, Kyushu University, Kasuga, 816, Japan

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
Copyright
© 1984 Cambridge University Press

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