层流作用下复杂多层沉积物颗粒再悬浮：统计分析与建模
Particle resuspension from complex multilayer deposits by laminar flows: statistical analysis and modeling
AI总结：
本文通过精细尺度模拟和统计分析，研究层流剪切流下复杂多层沉积床中球形颗粒的再悬浮动力学，揭示了颗粒在表面峰部更易脱离并经历短跳的规律，并提出基于表面坡度与高程的简单模型来再现脱离比率。
摘要：
颗粒再悬浮是指沉积在表面上的固体颗粒在流体流动作用下先被分离、随后被夹带离开的物理过程。本研究探讨了暴露于层流剪切流中的大而重的球形颗粒所构成的复杂沉积床的动力学。为此，我们基于精细尺度模拟，对单个颗粒周围的完全解析流场进行计算，并显式跟踪颗粒运动。利用统计工具，我们刻画了若干特征：（a）沉积床整体动力学（例如平均颗粒速度随高度的变化），（b）沉积床顶面的演化（例如表面高程分布或表面坡度分布），以及（c）单个颗粒在脱离或重新附着沉积床时的动力学（包括这些事件的发生频率，以及每次事件的速度差/表面角度）。结果表明，颗粒在沉积床顶面峰部附近脱离更频繁，并且一旦脱离，颗粒会经历短距离跳跃，随后迅速沉降回沉积床。本文提出了一个基于表面特征（包括坡度和高程）的简单模型，用于再现颗粒脱离比率。
英文摘要：
Particle resuspension refers to the physical process by which solid particles deposited on a surface are, first, detached and, then, entrained away by the action of a fluid flow. In this study, we explore the dynamics of large and heavy spherical particles forming a complex sediment bed which is exposed to a laminar shear flow. For that purpose, we rely on fine-scale simulations based on a fully-resolved flow field around individual particles whose motion is explicitly tracked. Using statistical tools, we characterize several features: (a) the overall bed dynamics (e.g. the average particle velocity as a function of the elevation), (b) the evolution of the top surface of the sediment bed (e.g. distribution of the surface elevation or of the surface slope) and (c) the dynamics of individual particles as they detach from or re-attach to the sediment bed (including the frequency of these events, and the velocity difference / surface angle for each event). These results show that particles detach more frequently around the peaks in the top surface of the sediment bed and that, once detached, they undergo short hops as particles quickly sediment towards the sediment bed. A simple model based on the surface characteristics (including its slope and elevation) is proposed to reproduce the detachment ratio.
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