An MPI parallel DEM-IMB-LBM framework for simulating fluid-solid interaction problems  

作　　者：Ming Xia Liuhong Deng Fengqiang Gong Tongming Qu Y.T.Feng Jin Yu 

机构地区：[1]Hunan Key Laboratory of Geomechanics and Engineering Safety,Xiangtan University,Xiangtan,411105,China [2]School of Civil Engineering,Southeast University,Nanjing,211189,China [3]Department of Civil and Environmental Engineering,Hong Kong University of Science and Technology,Hong Kong,China [4]Zienkiewicz Centre for Computational Engineering,Swansea University,Swansea,SA18EN,UK [5]Fujian Research Center for Tunneling and Urban Underground Space Engineering,Huaqiao University,Xiamen,361021,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第6期2219-2231,共13页岩石力学与岩土工程学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.12072217 and 42077254);the Natural Science Foundation of Hunan Province,China(Grant No.2022JJ30567).

摘　　要：The high-resolution DEM-IMB-LBM model can accurately describe pore-scale fluid-solid interactions,but its potential for use in geotechnical engineering analysis has not been fully unleashed due to its prohibitive computational costs.To overcome this limitation,a message passing interface(MPI)parallel DEM-IMB-LBM framework is proposed aimed at enhancing computation efficiency.This framework utilises a static domain decomposition scheme,with the entire computation domain being decomposed into multiple subdomains according to predefined processors.A detailed parallel strategy is employed for both contact detection and hydrodynamic force calculation.In particular,a particle ID re-numbering scheme is proposed to handle particle transitions across sub-domain interfaces.Two benchmarks are conducted to validate the accuracy and overall performance of the proposed framework.Subsequently,the framework is applied to simulate scenarios involving multi-particle sedimentation and submarine landslides.The numerical examples effectively demonstrate the robustness and applicability of the MPI parallel DEM-IMB-LBM framework.

关 键 词：Discrete element method(DEM) Lattice Boltzmann method(LBM) Immersed moving boundary(IMB) Multi-cores parallelization Message passing interface(MPI) CPU Submarine landslides 

分 类 号：U455.7[建筑科学—桥梁与隧道工程]