a question in the "electrochemical_polishing" example in comsol model library.
Dear Ivar Kjelberg, I am a comsol user, recently i am learning to use the "deformed geometry" function in comsol 4.2a, There is a good example in the model library named "electrochemical polishing". I...
View ArticleRF, 3D rib waveguide propagation. The no solution / poor convergence issue.
Hi, I'm modeling a complex 3D rib waveguide structure. I'm following the examples and solving boundary modes for both ports (1 excited) in study 1, and then choosing the correct mode I want to...
View ArticleTorsion Simulation in 2D axisymmetric
Hi, I am going to simulate a rod using the structural mechanics module in COMSOL v4.3. The rod is fixed at one end and a torque T is applied in the other end. So the strain is pure torsional. Can I use...
View ArticleFinding maximum along a line
Hi community, in my model (2D, x- and y-positions) I need to know the x-position of the maximum temeperature on any fixed y-position during the calculation over the whole domain. The problem is, that...
View ArticleHow to apply current on induction coil?
Hello, I am using Comsol Multiphysics 4.3, It's a new environment for me. My goal is to design the induction coil and put an alternativ current in it with the help of AC/DC module. I designed a model...
View ArticleMoving mesh - Particle moving through fluid
Fellow COMSOL enthusiasts, I am trying to get familiar with COMSOLs moving mesh feature, starting with a really simple example: a particle moving through fluid (e.g. Stokes flow around a sphere)....
View ArticleAbout convergence
Now I meet an unfamiliar issue. For the solver I had set the relative tolerance as 0.001 and used the direct solution. As the simulation processed, this value was lower than 0.001, but the simulation...
View ArticleSurfate to evaluate temperature
Dear people, is possible to define a surface where evaluate the temperature average after running simulation? I try to explain better: I have the result of a simulation made in university: my computer...
View ArticleRF module and Electric Circuit
I was wondering if anyone has had any luck using the RF module along with the electric circuit module? Trying to model a dipole with a diode between leg, with an induced voltage across the terminals....
View ArticleMicrowave not heating, but cooling. Why?
I'm using the Microwave Heating (mh) physics, with a Frequency-stationary study. Temperature initial condition set to 293.15[K]. I have the model surrounded by thermal insulation, except for one part...
View ArticleCIR coupling to pzd
Hello, I'm trying to couple a piezoelectric model with an electrical circuit. Applying a load on the piezo model, as I expect, high potential appears on a face and 0V to the opposite face. Then I...
View ArticleAccelerometer load
I am trying to apply load on a silicon mass and while trying to compute i get this error. stationary solver (sol1/s1). How do i get rid of this error. How can i apply a load of say 3g.
View ArticleHow to model the natural light illumination to the optical fiber
Hi all, I am trying to model the light transmission of the optical fiber. As I am new to Photo-optics, are there anyone know how to set the boundary as natural light illumination? I attached my model...
View Articletimediscrete initial conditions.
Hello, I used to work with comsol few months ago. I nomore work with because I have nomore accessto the machine, but at the end I was dealing with the timediscrete solver and faced a problem. If it...
View ArticleMaximum Number of Eigenvalues
Hello, I am looking at eigen frequencies in a simple beam. In the end I want the modal matrix and the corresponding eigen values. The error message I receive is that I can only solve for less than the...
View ArticleHow to run solve a nonlinear PDE problem
Hi, I am new user of comsol. I heard about comsol for it can solve PDEs. But it it very hard to find any examples about equation-based model, especially about the nonlinear PDEs. Could you give me some...
View Articleneed help URGENTLY! inverted mesh warning when applied fluid-structures module
Hi all, I'm facing inverted mesh problem when using fluid-structures model. I had model two "particle" and set channel as moving mesh. However, the simulation stop with huge inverted mesh warning and...
View ArticleExport animation/image sequence via Matlab Livelink
Hi, I'm have a HT problem which I solve time dependently via the Matlab Livelink. Since I have a lot of models to solve this way, I would like to export the image sequence of the solution automatically...
View ArticleThermal losses from RF Electromagnetic Waves
Dear all, my problem is the coupling between an RF probelm and a thermal problem, do to the test I made 2 "attached" Blocks and I solve before an RF problem on block1 with the calculation of the...
View ArticleTrouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
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