x and y polarization calculation
Hi all, I am doing Photonic Crystal Fiber project. I want to analyze the birefringence, for that how can I calculate the the effective indexes in x and y polarization method? I think it is with post...
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 ArticleRe-ordering of null vectors failed?
Hi, I'm wondering if anyone knows what "Re-ordering of null vectors failed" mean. I'm doing light propagates through a patterned nanostructure with periodic boundary condition, where the light has an...
View Article2D axisymmetric numeric port settings
Dear all, I am trying to model EM wave propagation through a tapered step-index fiber. Because of the large size of my geometry and the symmetry of the problem I use the 2D axisymmetric settings. My...
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 ArticleModeling elastic waves in a solid mechanics study
Hi, I'd like to ask a question concerning the modeling of elastic waves in the structural mechanics module. The geometry is a simple 3D beam, free on all sides. (file attached) My goal is to study the...
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 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 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...
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 ArticleAC/DC
Hey. How can I view the field lines of electric and magnetic field? Thank you. Bye.
View Articleidentity pair,assembly and port
Dear Ivar： My name is Guanjun Wang, a Chinese undergraduate student, i'm very appreciated of your selfless and accurate reply to many questioners, so i wanna ask you a question too, if convenient. I...
View Articleidentity pair,assembly and port
DearEdgar： My name is Guanjun Wang, a Chinese undergraduate student, i'm very appreciated of your selfless and accurate reply to many questioners, so i wanna ask you a question too, if convenient. I...
View Articledielectric heat up in capacitor
I am modeling the dielectric heat up in parallel plate capacitor using microwave heating. I have watched all the relevant videos available and tried a lot of possible ways to change my model, but it...
View ArticleTransmission and Reflection of a Three layered Structure
Hi All, I had designed a three layered structure. Using PORT 1, I excited the EM wave from the top of the ITO(Indium Tin Oxide) and placed second port(PORT 2) at the bottom of Ag(Silver). I had...
View Articleidentity pair,assembly and port
My name is Guanjun Wang, a Chinese undergraduate student, recently, I had encountered a problem about the identity pair. Using the assembly between two unions and creating a identity pair which...
View ArticleWhy does my S11 parameter change when adding a 2nd inactive port?
When looking at off-normal reflection from a periodic structure, my S11 results change when I add a second, unexcited periodic port (S2x). My first periodic port is sending a TM mode in Hy, with...
View ArticleOpening older files
Hi, I just upgraded my mac OS and the admin installed a newer version of COMSOL (4.4). I was wondering if I still can open my simulations made in older version of COMSOL. I think I had 4.2 or 4.3 .....
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