Consolidation of freshly deposited cohesive and noncohesive sediment: Particle-resolved simulations
Consolidation of freshly deposited cohesive and noncohesive sediment: Particle-resolved simulations
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DOI：
10.1103/physrevfluids.4.074305
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发表时间：
2019-06
影响因子：
2.7
通讯作者：
B. Vowinckel;E. Biegert;P. Luzzatto‐Fegiz;E. Meiburg
中科院分区：
文献类型：
--
作者：
B. Vowinckel;E. Biegert;P. Luzzatto‐Fegiz;E. Meiburg
本文采用基于浸没边界法的颗粒分辨直接Navier-Stokes数值模拟方法，分析了新沉积粘性和非粘性泥沙的固结问题。计算模型由材料特性参数化，不涉及任何任意校准。我们从第一性原理得到流体-颗粒混合物的应力平衡，并将其与经典的有效应力概念联系起来。从我们的模拟获得的详细数据集，使我们能够评估所有条款的衍生应力平衡。我们比较了粘性沉积物的沉降与非粘性沉积物的沉降，非粘性沉积物对应于单个初级颗粒的沉降。模拟结果产生一个完整的参数化的吉布森方程，这一直是选择的方法来分析自重固结。
We analyze the consolidation of freshly deposited cohesive and non-cohesive sediment by means of particle-resolved direct Navier-Stokes simulations based on the Immersed Boundary Method. The computational model is parameterized by material properties and does not involve any arbitrary calibrations. We obtain the stress balance of the fluid-particle mixture from first principles and link it to the classical effective stress concept. The detailed datasets obtained from our simulations allow us to evaluate all terms of the derived stress balance. We compare the settling of cohesive sediment to its non-cohesive counterpart, which corresponds to the settling of the individual primary particles. The simulation results yield a complete parameterization of the Gibson equation, which has been the method of choice to analyze self-weight consolidation.