Wednesday, 30 May 2012: 9:15 AM
Press Room (Omni Parker House)
The flow through and above forest canopies which cover much of the Earth's surface is abundantly non-uniform and complex. Since it is an essential ingredient to multi-scale transport-modeling, such as material evaporation and dispersion, simplified flow models which can incorporate additional physics are advantageous. In this talk we present a two dimension lattice-Boltzmann study of the volume-Reynolds average Navier-Stokes (VRANS) equations which we derived for a finite canopy model. The approach can be used to study the effect of leaf-area-density (LAD), turbulence intensity and boundary conditions on the flow through non-uniform canopies. We compare several solutions with detailed flow measurements obtained by a Particle Image Velocimetry at various regions along the finite canopy, and reveal the importance of the dispersive stress terms to the average momentum.
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