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 ArticleDomain Point Probe Inconsistency
Hi All, Like many newcomers to COMSOL, I'm having trouble with the Results section. As per suggestions on some other posts I've found, I have been using domain point probes to visualize a variable...
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 ArticleAcoustic Band Structure in 2d
Hi Folks - Ive posted a couple of questions to some related discussion but it looks like they haven't been visited in a while so I thought I would make a new discussion group. I am interested in...
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 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 Articlefemur modeling
Hi! I am building a model of femur(thigh bone) and aim at studying their stress and strain distribution on applying a pint load.I have built the model but it doesn't seem to compute,and i can't figure...
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 Articledifference in simulated stress and strain
Hi, I simulated stress for a 2D Silicon structure using "thermal stress" in COMSOL, the simulated stress values are quite consistent with my experimental results. however, when I look at the simulation...
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 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 ArticleHow to rename / view /specify specific boundaries in the geometry.
Dear sir, I have a trouble locating specified boundary in the geometry. I am new to learn COMSOL. I follow up tutorials that asks me to define certain conditions at certain boundaries. I depend on...
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