基于CFD-DEM的流-固耦合数值建模方法研究进展

Research progress of fluid-solid coupling model based on CFD-DEM coupling

随着土体渗流侵蚀研究的逐渐深入,对土颗粒流失和变形破坏机理的研究方法呈现出多尺度的特点。其中,计算流体力学-离散元耦合方法(CFD-DEM)为在细观尺度上研究流-固耦合相互作用对土体宏观力学特性的影响提供了一种行之有效的方法。针对CFD-DEM耦合方法在岩土工程领域应用现状,本文系统总结现有流-固耦合计算方法的优缺点,重点论述CFD-DEM耦合方法的建模策略,包括固相颗粒形状建模与粒间接触模型、流体相控制方程及参数计算方法,以及CFD-DEM耦合计算,并就相关问题进行深入探讨,最后提出了CFD-DEM耦合方法未来的发展方向。

With the gradual deepening of the study of seepage erosion in soil,the research methods of soil particle loss and deformation and failure mechanism show the characteristics of multi-scale.The computational fluid dynamics-discrete element coupling method(CFD-DEM)provides an effective method to study the macroscopic mechanical characteristics of soil on the microscale,considering the influence of fluid-solid interaction.Regarding the current application status of CFD-DEM coupling method in geotechnical engineering,this paper systematically summarizes the advantages and disadvantages of existing fluid-solid coupling calculation methods,focusing on the modeling strategies of CFD-DEM coupling method.These strategies include solid particle shape modeling and inter-particle contact models,control equations and parameter calculation methods for the fluid phase,as well as CFD-DEM coupling calculation.Furthermore,the paper conducts an in-depth exploration of related issues and concludes by proposing future development directions for the CFD-DEM coupling method.