Conductivity of the antenna, RF module
Dear All, I have question concerning optical antennas. I have model which consist of the optical antenna on substrate, and I want to calculate scattering cross section and field enhancement. My...
View ArticleIdentity pair as port source in Comsol 4
Hi all Does anybody knows how to set "identiy pair" as "port" in Comsol 4.0a or 4.1? I am calculating the reflectance and transmittance in Comsol. Previously, I used Comsol 3.5a for this work (refer...
View ArticleInput/Output Error Eigenvalue Solver
While trying to complete a parametric sweep eigenvalue study, the eigenvalue solver produced an Input/Output Error. Does anyone have suggestions on how to go about troubleshooting this error? -Model...
View ArticleHelp modeling supercooling effect in water to ice transition
Hello everyone, relatively new to COMSOL here, I am trying to create a model describing a simulation that took place in a climate chamber. I have attached a graph describing the temperature on the...
View ArticleCoupling of Electrostriction and Radiation pressure forces in silicon Waveguide
Dear All i hope that you are well, please if you can provide me by information about modeling such problem. Best regards Hassanain
View Articlepid control and constraining a variable
Hi, i'm making a pid control of a heat exchanger and I need to constraining the inlet velocity of fluid. The inlet velocity is calculated by the pid control law, but need to be constrained between...
View ArticleOscillations
Hi All, I had a quick question, I'm seeing oscillations emerge in my model (a 1D mass flow situation), and I was wondering: is it possible for these oscillations to emerge due to the solver (too coarse...
View ArticleModeling intensity field from high-intensity ultrasound source WITHOUT...
Hi, I cannot afford to buy the Acoustics module, so I'm wondering if it's possible to model the energy being deposited into a material due to multiple ultrasound sources. The KZK equation can be used...
View ArticleFour Electrode Method for Impedacne measurement
Hello~ I'm complete a new for COMSOL, but I have to use this for simulation. Right now I am trying to measure the impedance of the object with 4 electrode method. I used AC/DC module, Electric Current....
View Articleusing identity boundary condition.
Hi, I have just started using comsol and currently using 3.5 a I want to capture internal circulation inside a drop but i am not getting the velocity profile showing internal circulation. can anyone...
View ArticleHow to export a interpolation functio file.
Dear people, in a past thread I got an answer about interpolation function (http://www.comsol.it/community/forums/general/thread/32219/) but I don't know how export the interpolation function file, to...
View Articlesubdomain
hello I am working on design of photonic crystal fiber with Comsol using RF(mode analysis). I am using comsol with MATLAB. when I use loop in matlab to change the geometry to find the solution for each...
View ArticleWhere should I put constraint
Hi All, I'm not sure where I should put constraint or maybe I should use prescribed displacement in my model? My model (in attachment): I calculate the stationary state then I use stationary...
View Articlehelp about the finding parameters
Dear all I have problem in my model that , in the two coil system Excited primary coil with the Multi turn coil , and want to see the voltage , current and power in the second coil , and i want to see...
View ArticleConcetration should decrease when heating up a gas?
Hi, I´m modelling a gas that initially is entering to my geometry, with a given velocity, at a fixed concetration of H2 and at 25°C. In this geometry there is a barrier that is at 1100°C that is in...
View Articlefluid structure interaction
Hi , I'm facing a problem with FSI module . for the model in micro fluids library ( obstacle in fluid ) the dimensions are in microns , when increase the dimensions in Cm ( only scaling the model ) ,...
View Articlethe result of building half model to modal ansys(or eigenfrequency ansys ) is...
I build two models to modal ansys, one is half model and the other is whole model(the model is symmetrical),but the results i got is different. frist , the number of whole model`s modal Shape under...
View ArticleCalculating Electrostatic Force without MEMS Module
I've been having difficulty coupling the Electrostatics/Structural Mechanics/Moving Mesh applications. I was previously given advice to look up the MEMS 3D Cantilever Beam model to help me understand...
View ArticleHeat Pipe on a Heatsink
I watched the tutorial for Heatsink Analysis. I was wondering if we can develop the model by adding a heat pipe. I was told that it needs to be developed as a porous region but how the -thermodynamic...
View ArticleMeshing
Hello, I"m looking for good tutorials for showing the method of "user controlled mesh". I cannot find any good tutorial in COMSOL. Please let me know. Thanks.
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