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

Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2267-2281页

作者： Ming Xia Jinlong Fu Y.T.Feng Fengqiang Gong Jin Yu Hunan Key Laboratory of Geomechanics and Engineering Safety Xiangtan UniversityXiangtan411105China Zienkiewicz Institute for Modelling Data and AISwansea UniversitySwanseaSA18EPUK School of Civil Engineering Southeast UniversityNanjing211189China Fujian Research Center for Tunneling and Urban Underground Space Engineering Huaqiao UniversityXiamen361021China

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

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Experiment and simulation of slurry flow in irregular channels to understand proppant transport in complex fractures

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Particuology 2023年第12期83卷 194-211页

作者： Hai Qu Jun Hong Ying Liu Zhijun Zeng Xu Liu Xiangjun Chen Ruichang Guo Chongqing University of Science and Technology Chongqing401331China Department of Mining and Minerals Engineering Virginia TechBlacksburgVA24061USA

Slurry flow and proppant placement in irregular fractures are crucial to evaluate hydraulic fracturing stimulation but need to be better understood.This study aims to investigate how irregular fracture affects proppant transport and distribution using laboratory experiments and micro-scale numerical models.The unresolved method of the computational fluid dynamics(CFD)and the discrete element method(DEM)considers Saffman lift force,Magnus force,and virtual mass force to accurately capture the frequent interaction between proppant and slickwater.Experimental results validated the reliability of the optimized CFD-DEM model and calibrated primary parameters.The effects of crack height and width,bending angle,and distance between the crack and inlet on particle distribution were studied.The results indicated that the improved numerical method could rationally simulate proppant transport in fractures at a scale factor.The small crack height causes downward and upward flows,which wash proppant to the fracture rear and form isolated proppant dunes.A wider region in the fracture is beneficial to build up a large dune,and the high dune can hinder particle transport into the fracture rear.When the crack is close to the inlet,the primary fracture without proppants will close to hinder gas production.The smaller the bending angle,the smaller the proppant dune.A regression model can precisely predict the dune coverage ratio.The results fundamentally understand how complex fractures and natural cracks affect slurry flow and proppant distribution.

关键词： Slurry flow Sand transport particle-fluid interaction Irregular channel CFD-DEM

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REMARKS ON SINO-GERMAN WORKSHOP ON CHEMICAL AND PHYSICAL interactionS BETWEEN particleS AND fluidS

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Particuology 2005年第Z1期 143-144页

作者： Joachim Werther Department of Chemical Engineering I Technical University Hamburg-Harburg Hamburg 21071 Germany

This paper presents some remarks on the perspectives of process engineering in the 21st century extracted from the discussion at the workshop. It is considered that the field will be upgraded by introducing knowledge in other fields, extended to even more applications by generalizing the relevant methods, and unified to, at least covered by, the complexity science. Transdisciplinarity is necessary to cope with this challenge.

关键词： particle-fluid interaction complexity process engineering multi-scale multi-phase multi-level

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REMARKS ON SINO-GERMAN WORKSHOP ON CHEMICAL AND PHYSICAL interactionS BETWEEN particleS AND fluidS

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China Particuology 2005年第1期3卷 143-144页

作者： JinghaiLi JoachimWerther Multi-PhaseReactionLaboratory InstituteofProcessEngineering(IPE)ChineseAcademyofSciencesBeijing100080P.R.China DepartmentofChemicalEngineeringI TechnicalUniversityHamburg-HarburgHamburg21071Germany

关键词： particle-fluid interaction complexity process engineering multi-scale multi-phase multi-level

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