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基于DEM-PNM法的多孔介质多场流固耦合方法

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论文题目


 

A multi-field and fluid–solid coupling method for porous media based on DEM-PNM


Yao Zhu 1, Chun Liu 1,2,*, Hui Liu 1, Yu-dong Kou 1, Bin Shi 1
1 School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
2 State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Beijing, China.

 

研究内容

Abstract: Many processes in geology and geotechnical engineering fields involve multi-field coupling, fluid–solid coupling and large deformation. The numerical simulation of such complicated processes is still very challenging. Based on the Discrete Element Method, a pore density flow model is proposed to simulate multi-field coupling and fluid–solid coupling, which introduces the Pore Network Model to describe the pores. The fluid properties within a single pore are normalized to reduce the computational complexity and determine the amount of fluid exchange based on the Darcy’s Law. Moreover, an equation including density, pressure and temperature is introduced to simulate fluid state. The pore network changes dynamically with the displacement of elements, which can simulate the cracking and failure process of complex rock and soil mass driven by fluids. This model is implemented in the high-performance discrete element software MatDEM, which can quantitatively analyze the evolution law of fluid–solid coupling in the pore scale. Three examples are given to verify the validity of this model. The simulation results show that this model can not only form an effective network model based on the DEM, but also can reflect the immigration of fluids and heat in the porous medium and the development trend of fluid-driven fractures.

Keywords: Discrete element method;Pore network model;Multi-field coupling;Fluid-solid coupling;MatDEM

FIGURE 8  (a) Initial model; (b) schematic diagram of the temperature distribution;
(c) schematic diagram of the pressure distribution.

FIGURE 11 (a) Geothermal tank experiment equipment;
 (b) Top view of the sensor arrangement; (c) Discrete Element Model of Experiments.

FIGURE 13 Temperature-time cloud diagrams.

FIGURE 14  The discrete element model.

了解详情


 
Yao Zhu, Chun Liu, Hui Liu, Yu-dong Kou, Bin Shi,A multi-field and fluid–solid coupling method for porous media based on DEM-PNM,Computers and Geotechnics,Volume 154,2023,105118,ISSN 0266-352X,
https://doi.org/10.1016/j.compgeo.2022.105118.

来源:矩阵离散元MatDEM
ACTDeform多孔介质UM离散元
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首次发布时间:2023-12-30
最近编辑:10月前
MatDEM
中国自己的工程数值计算软件
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