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Spanwise turbulence structure over permeable walls

Published online by Cambridge University Press:  01 June 2017

Kazuhiko Suga Open the ORCID record for Kazuhiko Suga [Opens in a new window] ,
Yuka Nakagawa  and
Masayuki Kaneda
Kazuhiko Suga*
Affiliation:
Department of Mechanical Engineering, Osaka Prefecture University, Osaka 599-8531, Japan
Yuka Nakagawa
Affiliation:
Department of Mechanical Engineering, Osaka Prefecture University, Osaka 599-8531, Japan
Masayuki Kaneda
Affiliation:
Department of Mechanical Engineering, Osaka Prefecture University, Osaka 599-8531, Japan
*
†Email address for correspondence: suga@me.osakafu-u.ac.jp
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Abstract

Spanwise flow field measurements are carried out for turbulent flows in channels with permeable bottom walls by particle image velocimetry (PIV) to understand the effects of the wall permeability on turbulence structure near porous walls. The porous media used are three kinds of foamed ceramics which have the same porosities (0.8) but different permeabilities. The turbulent flow fields in spanwise planes are discussed using instantaneous and statistical measurement data. At a small permeability Reynolds number ($Re_{K}$), low-speed and high-speed streaks, which are similar to those of solid-wall turbulence, are observed near the walls while at a large $Re_{K}$ the observed structure is very different from that of the solid-wall turbulence. It is found that the obtained spanwise scales of the structure can be reasonably correlated with the wall normal distance plus the zero-plane displacement which is estimated from the mean velocity profile. With the distribution profiles of the spanwise streak spacing and integral length scales, the transitional change of the turbulence structure over permeable walls is discussed.

JFM classification

Turbulent Flows: Turbulent boundary layers Turbulent Flows: Turbulent Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 822 , 10 July 2017 , pp. 186 - 201
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Copyright
© 2017 Cambridge University Press 

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