The influence of large-scale turbulent structure on saltation sand transport

Abstract eng:
Saltation is an important process on aeolian sand transport, as it contributes to dust raising, bedform dynamics, and aeolian abrasion. However, the mass flux prediction remains notoriously unreliable, especially for close-to-onset saltation. Large eddy simulation and discrete particle method are employed to model the close-to-onset sand saltation in this paper. Two kinds of wall models for large eddy simulation are used as wall boundary condition, the standard model that can predict the mean wall shear stress and a new wall-model that is able to predict the fluctuating wall shear-stress from a large-scale velocity input. The results show that the latter can lead to more fluid-sheared particles and therefore higher mass flux, which demonstrate the significance of large-scale turbulent structure to unsteady environmental sediment transport.

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