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Turbulence modifications induced by the bed mobility in intense sediment-laden flows

Published online by Cambridge University Press:  02 November 2016

T. Revil-Baudard ,
J. Chauchat ,
D. Hurther  and
O. Eiff
T. Revil-Baudard
Affiliation:
Institut fur Hydromechanik, Kaiserstr.12, D-76131 Karlsruhe, Germany LEGI, Grenoble University, Domaine Universitaire, BP 53, 38041 Grenoble CEDEX 9, France
J. Chauchat*
Affiliation:
LEGI, Grenoble University, Domaine Universitaire, BP 53, 38041 Grenoble CEDEX 9, France
D. Hurther
Affiliation:
LEGI, Grenoble University, Domaine Universitaire, BP 53, 38041 Grenoble CEDEX 9, France
O. Eiff
Affiliation:
Institut fur Hydromechanik, Kaiserstr.12, D-76131 Karlsruhe, Germany
*
†Email address for correspondence: julien.chauchat@legi.grenoble-inp.fr
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Abstract

An experimental dataset of high-resolution velocity and concentration measurements is obtained under intense sediment transport regimes to provide new insights into the modification of turbulence induced by the presence of a mobile sediment bed. The physical interpretation of the zero-plane level in the law of the wall is linked to the bed-level variability induced by large-scale turbulent flow structures. The comparison between intrinsic and superficial Reynolds shear stresses shows that the observed strong bed-level variability results in an increased covariance between wall-normal ($w^{\prime }$) and streamwise ($u^{\prime }$) velocity fluctuations. This appears as an additional Reynolds shear stress in the near-wall region. It is also observed that the mobile sediment bed induces an increase of turbulence kinetic energy (TKE) across the boundary layer. However, the increased contribution of interaction events ($u^{\prime }w^{\prime }>0$, i.e. quadrants I and III in the ($u^{\prime },w^{\prime }$) plane) induces a decrease of the turbulent momentum diffusion and an increase of the turbulent concentration diffusion in the suspension region. This result provides an explanation for the modification of the von Kármán parameter and the turbulent Schmidt number observed in the literature for intense sediment transport.

JFM classification

Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Geophysical and Geological Flows: Sediment transport Turbulent Flows: Turbulent boundary layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 808 , 10 December 2016 , pp. 469 - 484
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Copyright
© 2016 Cambridge University Press 

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