Maximum 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 ArticleIntegration of Surface Flux During Simulation
Hello, I am trying to model a heterogeneous reaction by specifying a Flux boundary condition that depends on the surface concentration, gamma, which changes with time: gamma(t) = gamma(t=0) -...
View ArticleComsol 4.2a, RF MODULE, PML
Dear All, I have question about this module which I uploaded. Medium is air, substrate is glass, and I want to put some dipole on that glass. My question is about PML. As I know, I should put always...
View ArticleMesh Data Format
Hi, I have a 3D object that I'm trying to mesh. I exported the mesh data file and tried to understand its contents and ran into some issues. How are the geometric entity indices related to the mesh...
View ArticleRotating magnetic field in COMSOL 4.2a
Hi, I'm a new user, sorry for my english. I need help in COMSOL 4.2 for making a rotating magnetic field. This is the problem : I need to simulate a NDT (non destructive tesing) for search a defect in...
View Articleradiation in solids
i need to apply radiation as input for my model.. i used thermal stress physics. The radiation energy must be converted in terms of W/m3. I dont know how to convert. Please help.
View Articlemodelling corrosion in COMSOL 4.2
Hello everybody, I want to model steel reinforcement corrosion in concrete with COMSOL, but I have version 4.2. I also found that direct corrosion module is available in COMSOL 4.3 version only. So, I...
View ArticleDiffusion though cellular membrane
Hello, I would like to use comsol to solve the following problem: I would like to introduce some molecular beacons (small spheres for simulation´s sake) inside a cell. The idea is to open a certain...
View ArticleNot getting the circuit parameters
Dear all , i am simulating the two parallel coil , one above other , i am not getting circuit parameters like power and resistance in secondary coil , means there is no field in the secondary coil ,...
View Articlemetal helix and the magnetic field calculation
Hi! I have a question about a simulation done in ACDC physics. What I am trying to simulate is the magnetic field lines when there is a metal helix and current passing through it from one end to other....
View Articlewhy the metal plate of a capacitor is defined to be made of air instead of...
Hi all, I was looking at the "computing capacitance" model 12689, and I figued out that the metal plate material is defined to be made of air. Why we do not define the metal plate material as a kind of...
View ArticleBrownian forces evaluation problem
I am using the 4.3 version to calculate the Brownian forces on a 2D geometry. My model looks pretty much like the "Brownian Motion" model from the Comsol's Model Library. The solver converges and I...
View ArticleElectrical Conductivity as a function of Electric Field
Following some technical literature on the topic of a conductivity of a material (specifically a polymer) that is based on electric field, I wish to model this in COMSOL. In case you are curious, the...
View ArticleAsynchronous induction motor modeling
Dear friends! For several weeks I was trying to make a simulation of asynchronous induction motor in Comsol Multiphysics, without any success. I was searching this forum also for some examples but...
View ArticleSERS
Hey, I'm a student from China. I'm trying to use the Comsol to simulate the SERS(surface-enhanced Raman scattering). I feel confused. I don't know how to do. The attached file is what I'm finished. I...
View ArticleInterpolation Function Help
Good Morning, I'm having trouble using COMSOL's interpolation function, and I was hoping someone might be able to help. I'm trying to load data from a tab-delimited text file. I've followed the...
View ArticleAcoustic materials - integrate in the
Hi, i have a problem with the material library. I make some acoustic simulations with absorbing materials. There is the possibility to use the Delany & Bazley model in the acoustic module but in...
View Articleproblem with parameter sweep (Comsol4.2)..
Hi all, I have a wierd problem with paramteric sweep. I have a linear elastic, structural mechanics , stationary problem and I want to vary the young's modulus to see the effects. When I put the more...
View ArticleSurface current density unit
Dear All, I am currently doing a simulation on Comsol 4.2 on a 2D magnetic field representation. My question is regarding the input value of current density within magnetic fields module. I would have...
View ArticleElectric field between two electrodes
Hi, First of all let me tell you that I am a new user of comsol. Indeed, after some research, I trully believe in the significant impact that this software might have on my work. However, I am a...
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