Continuous and discrete models for the dynamic behaviors description of suspended sediment-fluid system

IF 4.2 2区环境科学与生态学 Q1 WATER RESOURCES

Advances in Water Resources Pub Date : 2025-09-02 DOI:10.1016/j.advwatres.2025.105104

Lian Wang , Yongchao Zhang , Xihua Chu , Hongguang Sun

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Abstract

Dynamic behaviors of suspended sediment-fluid system play an important role in the transport of bedload and the evolution of riverbed, but the related mathematical models are deficient or limited. In this paper, two models, micropolar fluid model and fluid-particle coupling model, are adopted in the dynamic behaviors calculation of the suspended sediment-fluid system in lid-driven cavity. We first establish the discrete solution program for micropolar fluid governing equations, and analyze the dynamic behaviors of suspended sediment-fluid system under different microstructure parameters. Meanwhile, the dynamic behaviors calculations are carried out by CFD-DEM (Computational Fluid Dynamics-Discrete Element Method) numerical method, and the influences of suspended sediment diameter and concentration are investigated. The results show that micropolar fluid model and fluid-particle coupling model can effectively describe the dynamic behaviors of suspended sediment-fluid system. The influences of microstructure parameters and macro-properties of suspended sediment at given range are almost same, suggesting the definite relationships existed between micro- and macro- quantities. Based on the equivalent effects of microstructure parameters to macro-properties of suspended sediment, micropolar fluid model is expected to replace CFD-DEM method completely in the study of the large-scale dynamic behaviors of suspended sediment-fluid system.

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悬浮物-流体系统动力学行为描述的连续和离散模型

悬沙-流体体系的动力特性对河床输运和河床演化起着重要作用，但相关的数学模型缺乏或有限。本文采用微极流体模型和流体-颗粒耦合模型两种模型对盖驱动腔内悬浮泥沙-流体系统的动力学行为进行了计算。首先建立了微极流体控制方程的离散解程序，分析了不同微观结构参数下悬浮泥沙-流体体系的动力学行为。同时，采用CFD-DEM （Computational Fluid Dynamics-Discrete Element Method）数值方法对其动力特性进行了计算，研究了悬沙直径和浓度对其动力特性的影响。结果表明，微极流体模型和流体-颗粒耦合模型能有效地描述悬浮沉积物-流体体系的动力学行为。在一定范围内，悬沙的微观结构参数和宏观性质对悬沙的影响基本相同，表明微观量与宏观量之间存在一定的关系。基于微观结构参数对悬沙宏观特性的等效效应，微极流体模型有望完全取代CFD-DEM方法研究悬沙-流体体系的大尺度动力行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Water Resources 环境科学-水资源

CiteScore

9.40

自引率

6.40%

发文量

171

审稿时长

36 days

期刊介绍： Advances in Water Resources provides a forum for the presentation of fundamental scientific advances in the understanding of water resources systems. The scope of Advances in Water Resources includes any combination of theoretical, computational, and experimental approaches used to advance fundamental understanding of surface or subsurface water resources systems or the interaction of these systems with the atmosphere, geosphere, biosphere, and human societies. Manuscripts involving case studies that do not attempt to reach broader conclusions, research on engineering design, applied hydraulics, or water quality and treatment, as well as applications of existing knowledge that do not advance fundamental understanding of hydrological processes, are not appropriate for Advances in Water Resources. Examples of appropriate topical areas that will be considered include the following: • Surface and subsurface hydrology • Hydrometeorology • Environmental fluid dynamics • Ecohydrology and ecohydrodynamics • Multiphase transport phenomena in porous media • Fluid flow and species transport and reaction processes