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Modeling granular material dynamics and its two-way coupling with moving solid bodies using a continuum representation and the SPH method
Computer Methods in Applied Mechanics and Engineering ( IF 7.2 ) Pub Date : 2021-07-16 , DOI: 10.1016/j.cma.2021.114022
Wei Hu 1 , Milad Rakhsha 1 , Lijing Yang 1 , Ken Kamrin 2 , Dan Negrut 1
Affiliation  

We outline a continuum approach for treating discrete granular flows that holds across multiple scales: from experiments that focus on centimeter-size control volumes, to tests that involve landslides and large buildings. The time evolution of the continuum used to capture the granular dynamics is resolved in space via the smoothed particle hydrodynamics (SPH) method. The interaction between the granular material and immersed rigid bodies is posed and solved as a “fluid”–solid interaction (FSI) problem using boundary conditions enforcing (BCE) SPH particles rigidly attached onto the boundary of the body interacting with the granular material. A new penetration-based particle shifting technique (PPST) is proposed to enforce the particle regularity and thus a stable simulation. Several numerical experiments (angle of repose, ball drop, and cone penetration) are carried out to validate the accuracy of the proposed methodology. The approach is subsequently demonstrated in conjunction with a 3D landslide simulation and a plowing operation. The approach discussed has been implemented and can be used in an open source simulation platform publicly available on GitHub. The implementation leverages GPU computing.



中文翻译:

使用连续介质表示法和 SPH 方法模拟颗粒材料动力学及其与移动固体的双向耦合

我们概述了一种用于处理跨多个尺度的离散颗粒流的连续方法:从专注于厘米级控制体积的实验到涉及滑坡和大型建筑物的测试。用于捕获颗粒动力学的连续体的时间演化通过平滑粒子流体动力学 (SPH) 方法在空间中解析。颗粒材料和浸没的刚体之间的相互作用被提出并解决为“流体”-固体相互作用 (FSI) 问题,使用边界条件强制 (BCE) SPH 粒子刚性附着在与颗粒材料相互作用的主体边界上。提出了一种新的基于渗透的粒子移动技术 (PPST) 来加强粒子的规律性,从而实现稳定的模拟。几个数值实验(休止角、落球、和锥体穿透)进行验证所提出的方法的准确性。随后将结合 3D 滑坡模拟和犁耕操作演示该方法。所讨论的方法已经实施,可以在 GitHub 上公开提供的开源模拟平台中使用。该实现利用了 GPU 计算。

更新日期:2021-07-16
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