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  4. Velocity and Surface Shear Stress Distributions Behind a Rough-to-Smooth Surface Transition: A Simple New Model
 
research article

Velocity and Surface Shear Stress Distributions Behind a Rough-to-Smooth Surface Transition: A Simple New Model

Chamorro, L.P.
•
Porté-Agel, F  
2009
BOUNDARY-LAYER METEOROLOGY

A simple new model is proposed to predict the distribution of wind velocity and surface shear stress downwind of a rough-to-smooth surface transition. The wind velocity is estimated as a weighted average between two limiting logarithmic profiles: the first log law, which is recovered above the internal boundary-layer height, corresponds to the upwind velocity profile; the second log law is adjusted to the downwind aerodynamic roughness and local surface shear stress, and it is recovered near the surface, in the equilibrium sublayer. The proposed non-linear form of the weighting factor is equal to ln(z/z (01))/ln(delta (i) /z (01)), where z, delta (i) and z (01) are the elevation of the prediction location, the internal boundary-layer height at that downwind distance, and the upwind surface roughness, respectively. Unlike other simple analytical models, the new model does not rely on the assumption of a constant or linear distribution for the turbulent shear stress within the internal boundary layer. The performance of the new model is tested with wind-tunnel measurements and also with the field data of Bradley. Compared with other existing analytical models, the proposed model shows improved predictions of both surface shear stress and velocity distributions at different positions downwind of the transition.

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Type
research article
DOI
10.1007/s10546-008-9330-x
Author(s)
Chamorro, L.P.
Porté-Agel, F  
Date Issued

2009

Published in
BOUNDARY-LAYER METEOROLOGY
Volume

130

Issue

1

Start page

29

End page

41

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
WIRE  
Available on Infoscience
February 22, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/47613
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