ERROR: 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 ArticleGenerate report with 4.1
I am wondering how to generate a detailed report like the one below in Comsol 4.1.resource.npl.co.uk/docs/scienc...symmetric/microdisk_report.pdf Couldn't find anything comparable in the documentation.
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 ArticleRotate Graphics Window 90deg in 2D Axisymmetric
Hi, Is it possible to rotate (90deg.) the graphics window in 2D axi. so the z-axis is horizontal and the r-axis is vertical. Thanks!
View Articlepiezoelectric cantilever coupled with an external electric circuit
Hi Ivan, we're still working on piezoelectric cantilever coupled with an external electric circuit. We obtain very good results in the case of open circuit. When we introduce a load resistance the...
View ArticlePiecewise function implementation
I"ve tried to implement the material properties, more specifically refractive index, in a 2D model of lens. Is there a way to define a piecewise function that describes the refractive index of all...
View ArticleParallel progamming using COMSOL 4.2a
Is it possible to install a license in a cluster? I've already have a Floating Network License (FNL) from 4.2a version installed in a computer that runs in Windows. Could I install the same license on...
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 ArticleHow to add AC source
Hi, In the simulation, a spiral antenna is excited by AC source in RF module. Physics is emw and study type is frequency domain. I want to use a square-wave AC to excite two terminals of antenna. My...
View Articleelectrospray simulation
Hi, I'm trying to simulate an electrospray experiment using comsol 4.1 in order to see the formation of droplets leaving a needle to a plate. A high voltage is applied on the needle and the plate is...
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 ArticleHow to use parameters between different physics?
Hello, my name is Wang Jiujiang from University of Macau. I am using COMSOL to simulate a capacitor, after I simulated using DC voltage, I want to add AC voltage. After I add a physics--circuit and...
View ArticleModeling 3D Induction heating with Frequency-Stationary simulation
Hi, I am trying to simulate induction heating due to a spiral inductor with different core materials. I want to perform a Frequency-Stationary analysis. I have the following problems: 1. The usual...
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 Articledoes a periodic boundary condition for u implement inflow u (boundary1) =...
Dear everyone, I have a question about the implementation of periodic boundary conditions for fluxes, so that the inflow through one boundary equals the outflow through the other. In comsol 3.5, this...
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