An eXtended Finite Element Method implementation in COMSOL Multiphysics: Solid Mechanics

Jafari, Ahmad; Broumand, Pooyan; Vahab, M.; Khalili, Nasser

doi:10.1016/j.finel.2021.103707

Cited by 39 publications

(15 citation statements)

References 56 publications

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“…The insulator model is evaluated using the ‘Quasi-Static Electric Current’ module in the time-steps domain solver. This module takes on gradually varying electromagnetic fields and currents, suitable for HV applications and insulator issues operation at power frequency [ 35 ]. The execution mode requires the user to specify the permittivity and conductivity of the pollution model specified by the nonlinear expression for field analysis and computations [ 36 ].…”

Section: Methodsmentioning

confidence: 99%

Field-Dependent Pollution Model under Polluted Environments for Outdoor Polymeric Insulators

et al. 2022

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In-depth understanding of the pollution problems such as dry bands and the polymeric aging process requires better determination of electric field strength and its distribution over the polymeric surface. To determine the electric field distribution over the insulator surface, this research proposes utilizing a novel approach model based on nonlinear electrical characteristics derived from experimental results for polluted polymer insulators. A case study was carried out for a typical 11 kV polymeric insulator to underline the merits of this new modeling approach. The developments of the proposed pollution model and the subsequent computational works are described in detail. The study is divided into two main stages; laboratory measurements and computer simulations. In the first stage, layer conductance tests were carried out to develop nonlinear field-dependent conductivity for the pollution modeling. In the second part, equipotential and electric field distributions along the leakage were computed using the finite element method (FEM). Comparative field studies showed that the simulation using the proposed dynamic pollution model results in more detailed and realistic field profiles around insulators. This may be useful to predict the formation of dry bands and the initiation of electrical discharges on the polymeric surface.

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Section: Methodsmentioning

confidence: 99%

Field-Dependent Pollution Model under Polluted Environments for Outdoor Polymeric Insulators

et al. 2022

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“…We chose the COMSOL Multiphysics software platform to model the thermal process, as it allows to make various calculations, solve a wide range of problems (also combining ongoing physical processes), use the finite element method, finite volume method and finite difference method. In addition, this platform allows to set the user's mathematical models and has its own environment for developing personalized user calculation applications [8].…”

Section: Modeling a Circuit Board For Simulating Electronic Device Op...mentioning

confidence: 99%

Digital Twin Technology: Modeling a Circuit Board for Simulating Electronic Device Operation

Tkacheva¹,

Makhinya²,

Donetskaya³

2021

Rev Adv Mater Tech

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We report on possible applications of the digital twin technology. We analyzed digital twin structures of various types considering their parameters in terms of usage. A circuit board model was designed and the device behavior was predicted during its operation at high temperatures close to critical or above critical values. The data obtained allows to optimize the device operation regimes and produce timely adjustments to the design.

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“…The Heat Transfer module offers heat transfer analysis in the host domain. For a detailed procedure of XFEM implementation of multiphysics fracture in COMSOL refer to Jafari et al (2022Jafari et al ( , 2021b, as well as the numerical models available online at https://github.com/ahmadjafari93/xfem-comsol.git Figure 4 presents the variation with time of three main parameters of the hydro-fracturing simulation, namely the crack length (CL), crack mouth opening displacement (CMOD) and the crack mouth pressure (CMP). In all cases, an excellent agreement is observed between the solutions obtained through the proposed discontinuous pressure method, the continuous pressure method, and the analytical relationships.…”

Section: Introductionmentioning

confidence: 99%

Multiphysics modelling of fractures in porous media using eXtended finite element method

Jafari¹,

Vahab²,

Khalili³

2022

Caving 2022: Fifth International Conference on Block and Sublevel Caving

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Hydraulic fracturing is a technique used to increase the extent of rock fractures via injecting highly pressurised fluid. A key parameter controlling the efficiency of such a stimulation technique is to capture and minimise the amount of fluid leaked into the surrounding porous rock. In the current study, a novel fully coupled eXtended finite element method (XFEM) hydrofracture model is introduced to capture the effect of fluid loss on the efficiency of the fracturing treatment through the generalised leak-off model. In the proposed generalised leak-off model, the effect of the pressure drop on the hydrofracture faces and the associated decrease in the amount of leaked fluid is considered. The XFEM is then implemented into the COMSOL Multiphysics software package for the first time. The developed framework enables the handling of fractures simulations in complex scenarios particularly when various physics such as rock deformation, fluid flow and heat transfer are involved.

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An eXtended Finite Element Method implementation in COMSOL Multiphysics: Solid Mechanics

Cited by 39 publications

References 56 publications

Field-Dependent Pollution Model under Polluted Environments for Outdoor Polymeric Insulators

Field-Dependent Pollution Model under Polluted Environments for Outdoor Polymeric Insulators

Digital Twin Technology: Modeling a Circuit Board for Simulating Electronic Device Operation

Multiphysics modelling of fractures in porous media using eXtended finite element method

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