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Prediction of erosion intermittency using Large Eddy Simulation
Geomorphology ( IF 3.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.geomorph.2020.107179
Pedro M. Brito , Almerindo D. Ferreira , Thomas Thiis , Antonio C.M. Sousa

Abstract The present CFD (Computational Fluid Dynamics) study investigates the triggering of aeolian erosion, which takes place on two transverse sand piles placed in tandem. The URANS (Unsteady Reynolds-averaged Navier-Stokes), DES (Detached Eddy Simulation) and LES (Large Eddy Simulation) approaches are evaluated on their prediction capability of the friction velocity. Each predicted friction velocity is evaluated against a proposed threshold condition, which considers the surface slope along with the near-surface flow direction to be compliant with established recirculation regions. The DES and LES approaches are found to be capable of predicting aeolian erosion intermittency, a phenomenon characterized by burst activity. The URANS approach, by yielding a nearly steady-state solution, predicts erosion only on a time-averaged basis. DES and LES approaches corroborate the reshaping observed in the wind tunnel tests, where the erosion is substantial on the leeward pile and insignificant on the windward one.

中文翻译:

使用大涡模拟预测侵蚀间歇性

摘要 目前的 CFD(计算流体动力学)研究调查了风蚀的触发,风蚀发生在两个串联的横向沙堆上。URANS(非定常雷诺平均纳维-斯托克斯)、DES(分离涡流模拟)和 LES(大涡流模拟)方法评估了它们对摩擦速度的预测能力。每个预测的摩擦速度都根据建议的阈值条件进行评估,该条件将表面坡度和近地表流动方向视为符合已建立的再循环区域。DES 和 LES 方法被发现能够预测风蚀间歇性,一种以爆发活动为特征的现象。URANS 方法通过产生近乎稳态的解决方案,仅在时间平均的基础上预测侵蚀。
更新日期:2020-09-01
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