com.comsol.nativejni.FlNativeException: Incorrect size of returned vector
Dear all, I'm working on a 2D PDE in coefficient form. In my model, one of the coefficients is set up by an external matlab function fun(t,x,y) according to:...
View ArticleTemperature and time-controlled heat generation
hello, I have a model in which (thermally induced) to start a reaction that takes place when reaching a specified temperature heat generation to another. has the heat generation is always a period of 2...
View ArticleWhich new feature(s) du you prefer in 4.3a ?
Hello I wanted to say to everyone: take a look at the Help: Mathematical "functions" and to "operators" there we have now got many newcomers given new flexibility to the GUI analysis, both for...
View ArticleAssing a sinusoidal body force F(x,y,z,t) in comsol 4.3
Dear all, I am trying to simulate shear wave propagation in tissue using a PDE wave equation (I manually defined the equations). In my geometry, I have a 3D box (imaging it is tissue) and in the center...
View ArticleConductivity 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 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 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...
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