Model couplings as inputs to functions
Hello All, I am trying to put in a temperature average over a boundary into an analytical function. This isn't working and is producing an error. I was wondering whether anyone would have any...
View Articleconversion of given simulation in to 4.0a or lower version COMSOL
Dear all, I will be very much thankful if you solve given simulation into lower version COMSOL (4.0a or lower). Please find attached COMSOL file.. Thanking You
View ArticleCoil inductance and resistance vs frequency
Hi, With the ACDC module of Comsol, I would like to calculate the standard parameters of air coil by taking into account frequency effect (inductance, resistance and capacitance of the coil) I would...
View Articlehow to simulate lamb wave in plate in comsol??
Hi, How to simulate lamb wave in comsol??how i will get symmetry mode & antisymmetry mode.?? pls help Regards!! Deepak
View Articlehow to plot the velocity profile between any two points in Comsol 4.2
In comsol 3.5, when I want to get the velocity profile from (0,0) to (0,4), I could use postprocessing--> cross section plot parameters --> line plot, then I can input cross section line data....
View ArticleDEP Model using Comsol 4.3
Hello, I am trying to do a DEP simulation in Comsol 4.3 and I want to apply an AC signal of 10V 14KHz in a pair of electrodes. I am presently using AC/DC model. I am able to apply a DC signal but I am...
View ArticleERROR: FAILED TO EVALUATE VARIABLE JACOBIAN, Variable: Freq
Hi, I am getting the following error: Failed to evaluate variable Jacobian. - Variable: freq - Geometry: 1 - Domain: 1 2 3 - Feature: Stationary Solver 2 (sol2/s2); - Error: Failed to evaluate variable...
View ArticleDiffraction Pattern
Hello, This is probably a very simple question. In the diffraction patterns example in the model library, how can I extract the amplitudes (or the intensity)? Many thanks Hamid
View Articlecomplex current density
Hi all, I'm working on getting the frequency dependent conductance and susceptance (real and imaginary admittance) of a simple resonating PZT block using the Piezoelectric Devices physics. I seem to be...
View ArticleMultiple physics with same dependent variable
I am working on a model with multiple physics, Electrostatics and Poisson's Equation and the dependent variable in both physics is Electric Potential. How do I set both the dependent variables using...
View ArticleCoupling of Electrostatics and Nerst plank equation
Hi, I am trying to solve two equations simultaneously as follows 1) Div(Grad (V)) = - rho/eps 2) Div(D*Grad(C) - Z*u_m*F*C*Grad(V)) = 0 where V is voltage ,rho is space charge density, eps is...
View ArticleModelling Compression of Material at a Rate
Hello, I am a beginner to COMSOL 4.2a and I would like to build a simple model where a material (a cylindrical block of polymer) is compressed at a rate of 10 mm/min. Using Solid Mechanics, I was able...
View Articleelectric field remains the same irrespective of the material used!!!!!
Hello friends, Am trying to simulate the electric field between two circular electrodes placed inside a circular dielectric field.Irrespective of the change in circular dielectric material the electric...
View ArticleMicrowave oven waveguide configuration
Hi everybody, I am trying to simulate a microwave oven using COMSOL, but I'm still a bit confused about configuring the waveguide. What is the difference between Transverse Electric (TE) and Transverse...
View ArticleHow to calculate force on a material???
Hello friends, Am trying to calculate force on a circle for an applied voltage, which physics should i choose?
View ArticleWhen I have to use 2d or 3d modeling?
Hi Everybody! I´m Wagner, from Brazil and I have a question, a simple question I think! How I decide if my modeling will be in 2d or in 3d? I have Heat Transfer and AC/DC model and I work calculating...
View ArticleVibration of a cantilever beam
Hi, I am trying to model a beam oscillating under external vibration condition. I have kept one end of the beam fixed. I have tried applying different kind of boundary conditions to solve the problem....
View ArticleElectromagnet modeling in 3D BH curve&relative permeability
Hi all, at start let me say I am new in Comsol. I am using v 4.0a AC/DC Magnetic Fields. What I am trying to model is type of a magnetic brake. It`s geometry is very similar to plain electromagnet,...
View Articlemode analysis for hollow core photonic crystal fiber
Hi, Is there anyone has experience doing mode analysis for the hollow core photoni crystal fiber? I tried to build the model but cannot find the confined mode although I am pretty sure the parameters I...
View Articlemaximum (or minimum) value in a time domain
Hi, I have a problem I cannot solve and you might help me. In my time-dependent analysis I would like to know the maximum of value of a variable, which has been reached at previous time steps. But I...
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