Hello guys, i just started to learn comsol, and i found a weird thing that makes me confuse a lot. A third book, the acdc module reference guide, contains. Dc discharges are attractive to study because the solution is time independent. Solutions are obtained by specifying an computing dc glow and arc discharges by means of comsol multiphysics. Determining optimal discharge strategy for rechargeable. Excerpt from the proceedings of the comsol users conference 2006 paris using comsol multiphysics to modelling high pressure discharge lamps jb. I tried both by using an external circuit physics and using the comsols inbuilt series rc circuit. Typographical conventions what can the acdc module do. Design of the cryocooled dc discharge system with heat. Is it possible to simulate dc thermal plasma using comsol multi physics plasma module. A dissertation submitted in partial fulfillment of the requirements for the degree of.
Mathematical modelling of stability of 1d and 2d dc glow. Conditions of currentcontrolled microdischarges in xenon are treated as an example. I could not make much headaway witht he inbuit comsol circuit but while using an external circuit, i was able to start the simulation running. Modeling revealed that electron emission mechanisms secondary emission vs. The main topics of this project are simulations of the cool down time of the pulsed dc system done in the physics simulation software comsol.
Engineers and scientists use it to gain insight into the physics of discharges and gauge the performance of existing or potential designs. The plasma module is tailormade to model and simulate lowtemperature plasma sources and systems. Equilibrium dc discharge interfacethe counterpart of the dc discharge interface. Ion stream of a dc electrostatic air pump, where a high voltage is applied between the corona and collector electrodes.
I have checked my model many times and still the problem persists. We developed and tested 2d extended fluid model of a dc glow discharge using comsol multiphysics software and implemented two different approaches. Acdc module physics guide acdc module study availability the model builder show and hide physics options where do i access the documentation and model library. Convergence issues with 2d dc discharge in plasma module. Setting up a global model of a nonmaxwellian discharge the equations in a global model are greatly simplified because the spatial information of the different quantities in the plasma reactor is. Current gain of a pulsed dc discharge in lowpressure.
The magnetic fields physics interface in the acdc module, and the corresponding 2d interfaces in the core comsol multiphysics software, can now use external material models implemented as userdefined dynamic libraries. Cryocooled dc spark system is one of the projects that addresses these demands and it is first setup where temperature will be controlled through a wide range, from room temperatures all the way down to 4 k. The most commonly used solvers in models of dc gas discharges are timedependent solvers. This increases the flexibility and the modeling capabilities of the physics interfaces. Comsol multiphysics software were used to study the uniformity of deposition on anode from dc discharge sputtering using ring and disc cathodes, then applied it experimentally to make comparison between film thickness distribution with simulation results. Single dielectric barrier discharge plasma actuators a dissertation submitted to the graduate school of the university of notre dame in partial ful llment of the requirements for the degree of doctor of philosophy by dmitriy m. I have designed a converging diverging geometry which acts as anode and a conical cathode. A screenshot of the boltzmann dc glow discharge app made with the. Study of stability of dc glow discharges with the use of. When the voltage exceeds a value called the striking voltage, the gas ionization becomes selfsustaining, and the tube glows with a colored light. Low pressure dc discharges were modeled using plasma module of the comsol fem software package. This functionality is built into the external material feature and allows. Control the deposition uniformity using ring cathode by dc.
How can i simulate dc plasma discharge interaction with. I am trying to model a 2d dc dishcarge in nitrogen with an external circuit. On the numerical modelling of a dc driven glow discharge plasma. Stability of 1d and 2d axially symmetric dc glow discharge against small perturbations is investigated in the framework of the linear stability theory with the use of software comsol multiphysics. The aim is to create an electric arc between the cathode and anode or rather to obtain a dc discharge when a potential is applied between the cathode and anode. Software comsol multiphysics and, in particular, its plasma module are gaining ground in the modelling of gas discharges.
The use of timedependent solvers is so standardized in gas discharge models that the plasma module of comsol multiphysics does not support stationary. The main topics of this project are simulations of the cool down time of thepulsed dc system done in the physics simulation software comsol. Comsol multiphysics, formerly called femlab, is a finite element analysis fea modeling, solver, and simulation software package for various physics and engineering applications, especially coupled phenomena, or multiphysics. Adaptation of comsol software to the simulation of corona discharge phenomenon p m. The acdc module provides a unique environment for simulation of acdc electromagnetics in 2d and 3d.
Dc glow discharge comsol multiphysics modeling software. Computing different modes on cathodes of dc glow and high. First, assembling the model from comsols general form pdes and, second, using comsols builtin plasma module. Using comsol multiphysics to modelling high pressure. Modeling of dc discharges in argon at low pressures. Multiphysics based electrical discharge machining simulation. As of update 2, the new rotordynamics module is available as an optional addon to the structural mechanics module.
Compressible flow with comsol multiphysics, how to model. Pdf on the accuracy and reliability of different fluid. The new viscous dissipation feature extends the capabilities of the comsol software to model viscous losses in flows. Computing dc discharges in a wide range of currents with. Global modeling of a nonmaxwellian discharge in comsol.
Cryocooled dc spark system is one ofthe projects that addresses these demands and it is first setup where temperaturewill be controlled through a wide range, from room temperatures all the way downto 4 k. Modeling a dc plasma torch with comsol multiphysics software. Corke, director graduate program in aerospace and mechanical engineering notre dame. The plasma module computes dc discharges by means of the timedependent solver. Recently, multiple dc glow discharge modes have been computed by means of stationary solvers of the commercial software comsol multiphysics 1. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Recreation of the stationary analysis models described in 5, 6, 7 and performing simulation using comsol multiphysics software. Dc glow discharges in the lowpressure regime have long been used for gas lasers and fluorescent lamps. Published 27 september 2011 2011 iop publishing ltd journal of physics d. Computing dc glow and arc discharges by means of comsol. Improving and expansion of the existing methods of corona discharge analysis to use them for the timedependent study of the process. This paper presents a non fourier heat conduction model to analyse the heat conduction from the electrical discharge plasma to the work piece in wire electric discharge machining edm process.
Apart from computing the multiple modes of arccathode attachment, stationary solvers have revealed the existence of hysteresis of the modes of arccathode attachment in highpressure arc discharges. Time dependent modelling and simulation of the corona. I want simulate dc plasma discharge interaction with electromagnetic wave using comsol. Plasma systems are complex, highly nonlinear systems that can lead to lowtemperature, nonequilibrium discharges. It is often created by applying a voltage between two electrodes in a glass tube containing a lowpressure gas. The comsol multiphysics software is a convenient tool for numerical solution of the eigenvalue boundaryvalue problem appearing in the framework of the linear stability theory. In this work we use comsol muliphysics software, specifically the equilibrium discharge multiphysics interface of the plasma module, to model a dc nontrasferred arc plasma torch fig. It is available for heat transfer in free flows and in porous media, and the viscous dissipation contribution is synchronized with the flow.
The 1d and 2d models show how to use the dc discharge interface to set up an analysis of a positive column. Determining optimal discharge strategy for rechargeable lithiumion batteries using multiphysics simulation. Introduction 5 introduction the acdc module is used by engineers and scientists to understand, predict, and design electric and magnetic fields in statics and lowfrequency applications. The module can perform analysis in all space dimensions 1d, 2d, and 3d. Learn how to create an app for modeling dc glow discharge using the application builder in comsol multiphysics. The steady state equations of conservation of fluid mechanics, heat transfer and electromagnetics are implemented by using the multiphysics couplings options available in the software. Adaptation of comsol software to the simulation of corona. The equations of conservation of fluid mechanics, heat transfer and electromagnetics are implemented by using the appropriate modules and the multiphysics. First, assembling the model from the general form comsol multiphysics pdes, and second, using comsols builtin plasma mod ule. The discharge models are based on the fluid description of ions and excited neutral species and. Modeling of coronainduced electrohydrodynamic flow with. A specialized physics interface is available for modeling direct current dc discharges, which are sustained through secondary. A comparative study of the same with fourier heat conduction is also simulated to study the difference between the two models. For example, this software was successfully employed for investigation of stability of current transfer to arc cathodes 24.
764 886 1290 1398 863 183 1092 1422 13 502 415 572 1001 722 373 1375 1403 1243 685 1378 222 152 1277 1550 151 1167 1100 170 138 707 550 855 1396 35 469 224 861 860