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A convection–diffusion CFD model for aeolian particle transport
Author(s) -
Ji S. B.,
Gerber A. G.,
Sousa A. C. M.
Publication year - 2004
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.724
Subject(s) - mechanics , computational fluid dynamics , shear stress , wind tunnel , convection , reynolds stress , meteorology , materials science , physics , turbulence
A convection–diffusion mixture model for estimating particle transport along loose surfaces, which can be incorporated within the framework of a computational‐fluid‐dynamics (CFD) solution, is presented. In consideration of the particle behaviour of saltation and suspension in wind tunnel tests, the particle flow is described by the basic parameters controlled by the surface shear stress and particle size. This description is used to derive a surface entrainment rate, and effective near‐wall saltation diffusion coefficient applied in mixture models of two‐phase flow. The derivation leads to equations that provide, based on a specified surface shear stress and particle size, an appropriately scaled estimation of the particle entrainment into the flow. Validation has been conducted against air–sand and air–coal systems where experimental and numerical predictions are available for comparison. Copyright © 2004 John Wiley & Sons, Ltd.