A particle-resolved heat-particle-fluid coupling model by DEM-IMB-LBM  

作　　者：Ming Xia Jinlong Fu Y.T.Feng Fengqiang Gong Jin Yu 

机构地区：[1]Hunan Key Laboratory of Geomechanics and Engineering Safety,Xiangtan University,Xiangtan,411105,China [2]Zienkiewicz Institute for Modelling,Data and AI,Swansea University,Swansea,SA18EP,UK [3]School of Civil Engineering,Southeast University,Nanjing,211189,China [4]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2267-2281,共15页岩石力学与岩土工程学报（英文版）

基　　金：financially supported by the Natural Science Foundation of Hunan Province,China(Grant No.2022JJ30567);the support of EPSRC Grant(UK):PURIFY(EP/V000756/1);the Scientific Research Foundation of Education Department of Hunan Province,China(Grant No.20B557).

摘　　要：Multifield coupling is frequently encountered and also an active area of research in geotechnical engineering.In this work,a particle-resolved direct numerical simulation(PR-DNS)technique is extended to simulate particle-fluid interaction problems involving heat transfer at the grain level.In this extended technique,an immersed moving boundary(IMB)scheme is used to couple the discrete element method(DEM)and lattice Boltzmann method(LBM),while a recently proposed Dirichlet-type thermal boundary condition is also adapted to account for heat transfer between fluid phase and solid particles.The resulting DEM-IBM-LBM model is robust to simulate moving curved boundaries with constant temperature in thermal flows.To facilitate the understanding and implementation of this coupled model for non-isothermal problems,a complete list is given for the conversion of relevant physical variables to lattice units.Then,benchmark tests,including a single-particle sedimentation and a two-particle drafting-kissing-tumbling(DKT)simulation with heat transfer,are carried out to validate the accuracy of our coupled technique.To further investigate the role of heat transfer in particle-laden flows,two multiple-particle problems with heat transfer are performed.Numerical examples demonstrate that the proposed coupling model is a promising high-resolution approach for simulating the heat-particle-fluid coupling at the grain level.

关 键 词：Particle-fluid interaction Heat transfer Discrete element method(DEM) Lattice Boltzmann method(LBM) Dirichlet-type thermal boundary Direct numerical simulation 

分 类 号：TU45[建筑科学—岩土工程]