Singular matrix error occurred
I am finding eigen frequency of two helical coils for wireless electricity. every thing is goes well: geometry, materials,Electromagnetic Waves- Frequency Domain & Mesh . But when I compute,...
View ArticleWaveguide Modeling
Hi, I am trying to make a simple model where a light source is incident of an input port of a waveguide and then it passes through a different media. I need to see the output power (Intensity) at port...
View Articlethe mass matrix is zero
Hello I am trying to simulate my design. In the first step, I tried Mode Analysis but unfortunately I faced this error: The mass matrix is zero Please let me know how can I fix it? Of course I read...
View ArticleExporting Far-field Polar plots data
I would like to export the Far-Field Polar plots data. When I tried to export , I cant plot similar to Polar plots in COMSOL. Any suggestions. It will be really helpful. Thank you.
View ArticlePeriodic boundary conditions
Hi I want to calculate transmission/ reflection coefficients from a periodic scatterer. If my incident wavelength becomes smaller than the period, COMSOL gives erroneous results. I guess its due to the...
View ArticleCOMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View Articlecoordinates of geometry objects
Hi all! How can I access the coordinates of geometric objects/domains for using in an expression? Alternately: how can I use distance of a domain or primitive center from a plane in an expression?...
View ArticleIrregular grating modeling using ports or background field
Dear all, I am a novice at comsol and has been building my first model for some time. I want to calculate the scattered field caused by a plane wave incident upon an irregular grating (with dozens of...
View ArticleWelcome to a new forum!
Welcome to The COMSOL Discussion Forum. The goal of the COMSOL Community section is to improve the community experience through increased communication, fellowship, and inclusiveness. It is a place for...
View ArticleEquation editing in Structural physics in Comsol 4.0
Hi Everyone, I was exploring comsol 4.0. I found that the GUI is good but some functionalities in 3.5a are removed. I wanted to edit the Structural physics equation system to suit my PDE. In comsol...
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 ArticleCOMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View ArticlePML error
Hi all, Can someone point me what I do wrong? I tried to repeat Scattering from plasmonic nanosphere model, so I have Au sphere + Air domain (sphere) +PML/ABC domain (sphere). When I defining PML as...
View ArticleSimulation error
Hi , I am getting this type of error whey i am trying to start simulation. "Variables property does not include all variables in Xmesh" Could anybody can give me any solution/ suggestion. Thank you...
View ArticleRecovering desired eigenfrequencies
Hi, I'm performing an eigenfrequency analysis of a model in the Comsol 4.3a RF module. My problem is that, though I ask for only 1 eigenfrequency, Comsol ALWAYS gives me 2 eigenfrequencies: one purely...
View ArticleReflection/transmission spectra of a free standing Ag film with periodic hole...
Hi, I want to use COMSOL 4.3a to simulate the reflection and transmission spectra of a free standing Ag film with periodic hole arrays. There is an error " Failed to find a solution for the initial...
View Article3D RF Module Calculation on Multiple Cores
I am planning to build a computer for running Comsol, and was hoping to find out how well Comsol can utilize multiple cores for RF Module calculations. The most demanding calculation that we would like...
View ArticleScatterer on substrate problem
Dear all Hello. I'm a beginner of COMSOL multiphysics. I have tried to calculate the effect of nanostructure on light scattering. Based on the user guide, "Scatterer on Substrate", I did it. However,...
View ArticleSRR modelling in comsol
Hi all, As I am quite new to the comsol, I really need some advice & help on how to model a periodic split ring resonator (SRR) medium. To make things easier, I started with modelling a single SRR....
View Article4-Coil System
Hi all, I am new in Comsol and I'm trying to model a 4-coil system consisting of Source coil, Transmitter coil, Receiver coil and Load coil. Basically, there will be a voltage source supplied to the...
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