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Verification of two-dimensional LBM-DEM coupling approach and its application in modeling episodic sand production in borehole

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Petroleum 2017年第2期3卷 179-189页

作者： Yanhui Han peter cundall Department of Civil Environmental and Geo-EngineeringUniversity of MinnesotaUnited States Aramco Services Company Aramco Research CenterHoustonUnited States

The lattice Boltzmann method(LBM)is implemented in the Particle Flow Code(PFC)as a pore-scale CFD module and coupled with the particulate discrete element assemblage in PFC using an immersed boundary *** implementation of LBM and LBM-PFC coupling is validated with the analytical solutions in a couple of hydrodynamics and fluid-particle interaction problems,i.e.,the accuracy of LBM as a CFD solver is verified by solving channel flow driven by a pressure gradient for which the closed-form solution is also derived;the accuracy of LBM-PFC coupling is validated by solving flow across a cylinder,Taylor-Couette flow,Karman vortex street,and fluid flow through a cylinder *** demonstrate potential applications of this coupling code,a perforation cavity subjected to axial fluid flush is then tested,showing that the collapse and reconstruction of sand arch in the perforation cavity can be reproduced in this coupling *** developed system is ready for exploring more complicated physical issues involved in sand production.

关键词： Lattice Boltzmann method Distinct element method Pore-scale fluid flow Fluidesolid interaction Perforation cavity

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Heat advection and forced convection in a lattice code–Implementation and geothermal applications

Rock Mechanics Bulletin

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Rock Mechanics Bulletin 2022年第1期1卷 75-89页

作者： Christine Detournay Branko Damjanac Maurilio Torres peter cundall Laryssa Ligocki Ivan Gil Itasca Consulting Group Inc.MinneapolisMNUSA BP America HoustonUSA

A three-dimensional thermo-hydro-mechanical numerical model has recently been enhanced with thermal capabilities to study the response of geothermal reservoirs to stimulation and *** this paper,we present an effort to consider three relevant thermal mechanisms in an existing lattice code initially designed for hydraulic fracturing:a)thermal advection in the fluid;b)heat transfer by forced convection from the rock to the fluid;and c)accurate thermal conduction in the rock matrix considering the thermal boundary layer effect.A numerical implementation of the new coupled advection-forced convection logic as well as the coupling with the existing conduction logic in the commercial code XSite is *** numerical solution is compared to analytical solutions for simple simulation *** new simulation capability is applied in a large-scale geothermal example to illustrate its performance.

关键词： Heat transfer Geothermal application Numerical simulation Lattice code

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Simulation and calibration of granules using the discrete element method

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Particuology 2014年第1期12卷 40-43页

作者： peter Müller Jürgen Tomas Institute of Process Engineering Mechanical Process EngineeringOtto-von-Guericke University MagdeburgUniversitätsplatz 239106 MagdeburgGermany

The discrete element method （DEM）, developed by cundall and 5track to solve geomecnamcai problems, is used to simulate the mechanical behavior of granules. According to the DEM, an individ ual granule can be modeled as a realistic mechanical system consisting of primary particles bonded by interaction forces. Cranulometric properties of the model material, zeolite 4A, have been measured to determine their macro properties. To investigate the compression behavior, a compression test was performed using a strength tester on single granules between two pistons. A modeled granule consisting of more than 22,000 primary particles was generated. The micro properties of the modeled granule have been precisely set to allow its macro properties to be equivalent to the macro properties of zeolite 4A granules. To calibrate the mechanical properties, diametrical compression was simulated using two rigid walls stressed at a constant stressing velocity, The force-displacement curve of the modeled granule at compression has been calibrated by the experimental curve of zeolite 4A.

关键词： Discrete element method Material behavior Granulation

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