Joule heating
Hello, I am trying to study the joule heating by applying a current density to a material (simple block). I know how to do this by applying a ground and potential boundaries to the block (making a...
View Articlemechanical vibrations
Hi, What kind of Module are used in Comsol to study mechanical vibrations ? Thanks, CR
View ArticleHow to justify the internal heat generation in comsol???
hi every one, i am using comsol 4.1. i want to give a internal heat generation on rectangle..how can justify internal heat generation in comsol any one help me?? thanking you, parma
View ArticleDroplet Spreading
Hi I starting my PhD this year and have started to use COMSOL recently. I want to simulate a sessile droplet spreading over a flat surface, which I tried to implement using 2D axisymmetric, level set...
View ArticleMathematics Module: Coupled Simulation: How to access dependent variable at...
Hello! I want to couple a time dependent PDE with an ODE. The dependent variable of the PDE system is u1, the one for the ODE is v1. Now I want the value u1x(x_s) (i.e. the value of u1x at position...
View ArticleUrgent research problem: How to solve PDE systems( 2 PDEs 2 unknown u1,u2...
1.Each PDE is composed of u1,u2. How to set up the coupling process? 2. The spatial dependence for this problem can be reduced to 1D. du/dx But it is a 2D rectangle. The laplcian operator will also...
View Articlepredescribed displacement equals displacement value at certain point
hi guys, I'm pretty new to Comsol and i'm trying to implement a certain kind of boundary condition. Perhaps there is an easy solution to this, but i can't figure it out. My Problem is that i want to...
View Articlemagnetic field -problem with mesh in a frequency domain study
Hello, I have some convergence problem in my 3D study. I build a geophisycal magnetotelluric model, a stratified earth (layers at different electrical conductivity ). I will measure the impadance at...
View ArticleDealing with Periodic Boundary Conditions, PMLs and interfaces.
Hello, I'm trying to simulate a nanoparticle array over a substrate in order to study its extinction cross-section. To do so I've made a cell with periodic boundary conditions on the sides and two PMLs...
View Articleabout error in value getting
Dear all , I am doing simulation on inductive coupling , taking two coils , one with six turns , another with single turn , I am exiciting my coil by voltage at 320 V , and i am observing the flux and...
View ArticleExtracting absorbed power
Hi all! I am currently doing a 2D model where I have an incoming power, and then I have absorption within the material. As a result, I have the value of the intensity everywhere, but I don't know how...
View Articletemperature control in heat transfer
Hello, I am modelling a heat transfer problem, and the details are: when the temperature increases to 315K, heating is stopped; however, when temperature drops belows 310K, heating restarted. If the...
View ArticleBoundary condition T parameter
Firstly: I have created a 'Heat Flux' boundary condition that varies due to an external temperature. My model is a 1D model of heat transfer in solids. In the field labelled 'External temperature' I...
View ArticleModeling aluminum plate heating
Hi. I am lost and need some help. I need to modeling the following case: The heating suffer by an aluminum plate that it is illuminated by a lamp formed by a matrix of 7x7 leds with a total power of 49...
View ArticleGlobal parameters vs. Model/Definitions/Variables
It seems that the geometry can only be defined by global parameters while the rest of the modeling can also use variables. Is there a way to access the model variables in the geometry such as...
View ArticleHow to creat TE plane wave in Comsol 4.0 RF module
I am a new player in Comsol 4.0. My question is : How to creat ideal TE plane wave in Comsol 4.0 RF module? How can we know the wave produced is an TE plane wave? I tried three methods as mentioned in...
View ArticleCalling an outside script
Hi all! I'm starting a new project in COMSOL (I'm quite new to the program). The thing is, I have a fortran routine that solves a radiation exchange progress between surfaces quite in an efficient way....
View ArticleNew user-defined material
I'd like to add a material to the user-defined materials list. I've looked through the manual and don't see how to do this. Furthermore, there are no materials in the database that seem similar enough...
View ArticleHow to reduce the model file size
Hi, I built a 3D heat transfer, time dependent model. After simulation, the model file goes beyond 5G. Is there anyway I can reduce the file size? I only care how the maximum temperature changes with...
View ArticleMoving laser
I'm a simulation a moving laser though a zinc pill, the problem is that i can't move the surface with the heat flux, the thing is that if i use a Parametric sweep Comsol will compute one point and...
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