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Saltating particles in a turbulent boundary layer: experiment and theory

Published online by Cambridge University Press:  14 April 2009

M. CREYSSELS ,
P. DUPONT ,
A. OULD EL MOCTAR ,
A. VALANCE ,
I. CANTAT ,
J. T. JENKINS ,
J. M. PASINI  and
K. R. RASMUSSEN
M. CREYSSELS
Affiliation:
IPR, Université de Rennes 1, CNRS UMR 6251, Campus Beaulieu, 35042 Rennes, France
P. DUPONT
Affiliation:
LGCGM, INSA de Rennes, Campus Beaulieu, 35043 Rennes, France
A. OULD EL MOCTAR
Affiliation:
Thermocinétique, Polytech. Nantes, CNRS UMR 6607, 44306 Nantes, France
A. VALANCE*
Affiliation:
IPR, Université de Rennes 1, CNRS UMR 6251, Campus Beaulieu, 35042 Rennes, France
I. CANTAT
Affiliation:
IPR, Université de Rennes 1, CNRS UMR 6251, Campus Beaulieu, 35042 Rennes, France Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY 14853, USA
J. T. JENKINS
Affiliation:
IPR, Université de Rennes 1, CNRS UMR 6251, Campus Beaulieu, 35042 Rennes, France Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY 14853, USA
J. M. PASINI
Affiliation:
Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY 14853, USA
K. R. RASMUSSEN
Affiliation:
Department of Earth Sciences, University of Aarhus, DK-8000 Aarhus C, Denmark
*
†Email address for correspondence: alexandre.valance@univ-rennes1.fr
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Abstract

The work presented here focuses on the analysis of a turbulent boundary layer saturated with saltating particles. Experiments were carried out in a wind tunnel 15m long and 0.6m wide at the University of Aarhus in Denmark with sand grains 242 μm in size for wind speeds ranging from the threshold speed to twice its value. The saltating particles were analysed using particle image velocimetry (PIV) and particle-tracking velocimetry (PTV), and vertical profiles of particle concentration and velocity were extracted. The particle concentration was found to decrease exponentially with the height above the bed, and the characteristic decay height was independent of the wind speed. In contrast with the logarithmic profile of the wind speed, the grain velocity was found to vary linearly with the height. In addition, the measurements indicated that the grain velocity profile depended only slightly on the wind speed. These results are shown to be closely related to the features of the splash function that characterizes the impact of the saltating particles on a sandbed. A numerical simulation is developed that explicitly incorporates low-velocity moments of the splash function in a calculation of the boundary conditions that apply at the bed. The overall features of the experimental measurements are reproduced by simulation.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 625 , 25 April 2009 , pp. 47 - 74
Copyright
Copyright © Cambridge University Press 2009

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Footnotes

‡

Present address: United Technologies Research Center, 411 Silver Lane, East Hartford, CT 06108, USA

References

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