Relative Tolerance
Hi I have done some simulations and the intial values used are the default ones. I was wondering when does initial values are important? Is it important to set the relative tolerance for a problem...
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 ArticleJoule 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 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 ArticleFinding the location of the maximum of a variable
Dear Comsol Community, I am looking for a way to find the location of the maximum of a variable. Getting the maximum value is easy, but so far I have not been able to get the coordinates of the...
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 Article[Turbulent flow + Heat transfer] Impacting Jet in Low-Re Comsol 4.1 model
Hello all ! I am trying to validate my model by comparing a simple axisymetric 2D impacting flow of air on a surface. The geometry is simple: a cylindrical (diameter d=26.5e-3[m]) jet of air (debit...
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