Large eddy simulation of dune evolution by wind erosion, sand transport and deposition
Résumé
Sand dune deformation is a dynamic process resulting from complex interactions between the atmospheric boundary layer, aeolian particle transport, sand erosion and dune deformation. This work undertakes these problems by conducting three-dimensional numerical simulations of solid particle transport over a deformable sand dune. A turbulent boundary layer flow is computed by Large-eddy simulation (LES). A complete model has been developed for sand particle transport from saltation initiation to particle-surface interactions. Simulation of a time evolving dune, corresponding to the experiments of Ferreira et al. (2012), is performed. Numerical results match with the experimental ones. A consistent small-scale tool for predicting particle transport and wind erosion of a deforming dune is constructed and validated in this work.
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