Multi-physics two-layer SNS-PFEM for granular mass–water large deformation problems

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2025-06-11 DOI:10.1016/j.ijmecsci.2025.110492

Zi-Qi Tang , Yin-Fu Jin , Jie Yang , Zhen-Yu Yin , Xiangsheng Chen

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引用次数: 0

Abstract

Most traditional Thermo-Hydro-Mechanical (THM) coupling approaches are constrained by their single-point three-phase representation, hindering accurate multi-phase interaction simulation. Thus, this study introduces a novel multi-physics two-layer stabilized node-based smoothed Particle Finite Element Method (SNS-PFEM) simulating Thermo-Hydro-Mechanical (THM) coupled large deformation problems between granular mass and water. The key novelties of this proposed method include: (1) incorporating thermal coupling into the existing SNS-PFEM framework, expanding its applicability; (2) utilizing two-layer Lagrangian meshes to independently represent and solve for granular materials and water; (3) employing a fractional step algorithm for solving motion and pressure fields, and an explicit method for solving temperature fields; (4) modeling the interaction between granular materials and water in mesh overlapping regions through drag forces, with heat exchange incorporated via Robin boundary conditions; and (5) combining SNS-PFEM for granular materials to mitigate temporal instabilities with T3-PFEM for water to enhance computational efficiency. The accuracy of the proposed numerical method is validated through a series of benchmark tests, ranging from two-physics coupling (e.g., TM coupling, TH coupling, and HM coupling) to the complex THM coupling. The proposed approach is subsequently applied to two practical cases considering THM coupling: landslide-induced waves and seepage-induced slope instability. The result comparisons highlight the method’s superiority in simulating the THM-related large deformation, demonstrating its potential as a promising tool to solve complex geotechnical engineering.

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颗粒体-水大变形问题的多物理场双层SNS-PFEM

大多数传统的热-水-机械耦合方法受限于其单点三相表示，阻碍了准确的多相相互作用模拟。因此，本研究引入了一种新的基于多物理场两层稳定节点的光滑颗粒有限元方法（SNS-PFEM），用于模拟颗粒体与水之间的热-水-机械（THM）耦合大变形问题。该方法的主要创新点包括：(1)将热耦合纳入现有的SNS-PFEM框架，扩大了其适用性；(2)利用两层拉格朗日网格对颗粒材料和水进行独立表示和求解；(3)采用分步算法求解运动场和压力场，采用显式方法求解温度场；(4)通过阻力模拟网格重叠区域颗粒材料与水的相互作用，并通过Robin边界条件加入热交换；(5)将颗粒材料的SNS-PFEM与水的T3-PFEM相结合，以减轻时间不稳定性，提高计算效率。通过一系列基准测试，从双物理耦合（如TM耦合、TH耦合和HM耦合）到复杂THM耦合，验证了所提数值方法的准确性。随后将该方法应用于考虑THM耦合的两个实际情况：滑坡诱发波和渗漏诱发边坡失稳。结果对比显示了该方法在模拟thm相关大变形方面的优势，显示了其作为解决复杂岩土工程的有前途的工具的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Mechanical Sciences 工程技术-工程：机械

CiteScore

12.80

自引率

17.80%

发文量

769

审稿时长

19 days

期刊介绍： The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.