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首页> 外文期刊>Applied Mathematical Modelling >A Lagrangian-based SPH-DEM model for fluid-solid interaction with free surface flow in two dimensions
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A Lagrangian-based SPH-DEM model for fluid-solid interaction with free surface flow in two dimensions

机译：基于Lagrangian的SPH-DEM模型，用于二维的自由表面流固耦合

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摘要

A Lagrangian-based SPH-DEM coupling model is proposed to study fluid–solid interaction (FSI) problems with free-surface flow. In this model, SPH uses an incompressible divergence-free scheme for simulating complex flow problems. Based on the Mohr–Coulomb criterion with tension cut, the DEM describes the characteristics of solid deformation and failure by means of contact models between particles. The coupling mechanism between SPH and DEM is realised by the decoupling of the force field during the process of fluid–solid interaction. That is, the motions of fluid and solid particles are reflected by the Navier–Stokes equations and interactions among solid particles are determined by Newton's second law in the DEM. To demonstrate the applicability of the SPH-DEM model, three case studies are used to verify the different fluid interaction situations with rigid bodies, deformable objects, and granular assemblies, respectively. The results of the proposed model shows good agreement with experimental data and indicates that it is capable of capturing the features of solid movement, deformation and failure under complex flow conditions with convincing accuracy and high efficiency.
机译：提出了基于拉格朗日的SPH-DEM耦合模型，以研究自由表面流动的流固耦合（FSI）问题。在此模型中，SPH使用不可压缩的无散度方案来模拟复杂的流动问题。根据带有拉力削减的Mohr-Coulomb准则，DEM通过粒子之间的接触模型描述了固体变形和破坏的特征。 SPH与DEM之间的耦合机制是通过流固耦合过程中力场的解耦实现的。也就是说，流体和固体颗粒的运动由Navier-Stokes方程反映，而固体颗粒之间的相互作用由DEM中的牛顿第二定律确定。为了证明SPH-DEM模型的适用性，使用了三个案例研究来分别验证与刚体，可变形物体和颗粒组件的不同流体相互作用情况。所建模型的结果与实验数据吻合良好，表明该模型能够准确，高效地捕获复杂流动条件下的固体运动，变形和破坏特征。

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