ion motion in DC plasma
Hej there, I have a problem with the DC discharge plasma. I need to simulate a plasma in a tube with a gas flow. The plasma is generated through some decay reaction in the tube (in reality due to...
View ArticleUnidirectional coupling of a time dependent study to a stationary study
Hello, I am using structural mechanics module and a stationary study to calculate stresses and strains in a simple 2D axi-symmetrical model. The model has a thermal expansion node. I have another study...
View Article3D Modelling of a pair of cylindrical magnets
Hi! I need to model the magnetic field lines when a pair of cylindrical magnets of 1.5T are placed at a distance between each other. How do I go ahead? Please help! PS: Am a beginner. Thanks!
View ArticleNo change in a time dependend model. Where is the fault?
I tried a very simple model: = 3-D cylinder from = copper (from the builtin material library) with an = initial temperature of 293.15 K = insulated at all surfaces, with one = heated bottom surface at...
View ArticleAbsolute tolerance convergence criteria for flow simulations.
Hey. Normally convergence criteria are divided into a relative and an absolute. Where can I find and set the absolute tolerance for my transient flow simulation. Thank you for your time
View ArticleParticle tracing: timing issues
Hello, I have created a simulation suite that calculates the electrostatic field of a given device and traces particles through this field. Since none of the available particle release nodes suited my...
View ArticleError during multiphsics
Hi.. We are try to design saw delay line gas sensor, during the simulation we got error as- Fail to find destination boundaries or destination selection empty please help us to sort out this error. --...
View ArticleMeasurment of mutual impedance of a dipole. Problem with results and derived...
Hello, I am using Comsol to model a dipole and a in a middle of permittivity 80 and conductivity 0. The model is a simple one and the study is in the frequency domain. The module used is AC/DC -...
View ArticleAC/DC
Hey. How can I view the field lines of electric and magnetic field? Thank you. Bye.
View ArticleQuestion on heat transport turbulence model
Hi, I am using the Non-Isothermal Flow (nitf) module and I have a question on the heat transport turbulence model. In the equation given by COMSOL, rho * Cp * dT/dt + rho * Cp * u . Grad(T) = Grad . (k...
View ArticleTime dependent fluid problem
Hi I am trying to model a time dependent flow of a newtonian fluid in 2D. The geometry I'm using has sliding walls which cause a flow to be established. The aim of using a time dependent simulation is...
View ArticlePlacing a finite element model into an electrical circuit in COMSOL 4.1
Hello, I have recently made the switch from COMSOL 3.5a to COMSOL 4.1, and I am currently unable to do things that I used to be able to do very easily, namely placing my 3-D model (drawn and defined in...
View ArticleJava Runtime Environment error
Getting following error, A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003da3efbc6c, pid=6909, tid=46912497239488 # # JRE version: 6.0_20-b02 # Java VM:...
View ArticleCOMSOL Releases COMSOL Multiphysics version 4.3a
We at COMSOL are proud to introduce version 4.3a of COMSOL Multiphysics to the COMSOL community See: www.comsol.com/products/4.3a/ This introduces: * LiveLink™ for Excel® * LiveLink™ for Solid Edge® *...
View ArticleSubsurface flow in heterogeneous reservoir......
Hello all, I am trying to simulate a model which contains square geometry and two circles(inlet and outlet). I am a new user of COMSOL and facing many problems like how to put inflow and outflow rate...
View ArticleDisk error while writing to to temporary file
When I try to open up larger COMSOL files I get this error. What does it mean and how can I avoid it? I have tried in two different versions of COMSOL (4.3b and 4.4) and get the same error no matter...
View ArticleProblem with Heat Source temperature dependence
Hello, I am trying to simulate pulsed laser heating of silicon wafer. I am using heat transfer module. My problem is 2-dimensional - my wafer is a cylinder and laser is above the center of it placed...
View ArticleCoupling of Drift Diffusion and Heavy Species Transport Plasma
Hello, I would like to simulate a cold plasma (Tritium ions/Electrons) in a tube in a high magnetic field. On one side of the tube there is a potential (some Volts) and on the side walls of the tube...
View Articleelectrostatic
hello all, I have a simulasion on COMSOL resolution of the equation of fish (Maxwell's equations) electrostatic My problem must solve this equation, we must obtain the charge density, current, electric...
View ArticleFrequency domain propagation, loss, refelcetion
Hi all Comsol friends, I am calculating the transmitted power loss for one 2-D waveguide, use intop2(emw.nPoav)/intop1(emw.nPoav) intop2 is the integration of output bounday. intop1 is the integration...
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