Coupling pore network and finite element methods for rapid modelling of deformation
Coupling pore network and finite element methods for rapid modelling of deformation
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DOI：
10.1017/jfm.2020.381
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发表时间：
2020-08-25
影响因子：
3.7
通讯作者：
Tahmasebi, Pejman
中科院分区：
文献类型：
--
作者：
Fagbemi, Samuel;Tahmasebi, Pejman
流体力学系统中变形的数值模拟可能是耗时的，使用完全耦合的经典数值方法，大型代表性的多孔介质样品。本文提出了一种新的双向耦合分区流固系统。耦合系统用于模拟孔隙尺度的地质力学过程。我们跟踪固体的变形所造成的排水的常驻流体在孔隙中，以及从动态加载的流体性质的演变。有限元方法负责捕捉耦合系统中的结构变形，而动态孔隙网络用于模拟流体子系统中的多相流。通过凸壳法在每个孔隙网络-有限元节点连接处创建一个虚拟的流固界面，然后使用线性插值进行数据交换。结果表明，与预先存在的耦合有限体积模型和计算在更短的时间内完成了良好的协议。
Numerical modelling of deformation in hydromechanical systems can be time-consuming using fully coupled classical numerical methods for large representative porous media samples. In this paper, we present a new two-way coupled partitioned fluid-solid system. The coupled system is applied for simulating geomechanical processes at the pore-scale. We track the deformation of the solid resulting from the drainage of resident fluids in the pores, as well as the evolution of fluid properties from dynamic loading. The finite element method is responsible for capturing the structural deformation in the coupled system while the dynamic pore network is used for modelling multiphase flow in the fluid subsystem. A fictitious fluid-solid interface is created at each pore network-finite element node junction via convex hulling, followed by data exchange using linear interpolation. The results show good agreement with a pre-existing coupled finite volume model and the computations are completed in much less time.