Need to surface plot first stress invariant
Version comsol: 3.4 I was wondering if there was a way to input an expression for first stress invariant (or any other stress state) to Comsol 3.4 and surface plot the results. thx
View ArticleError "Attempt to evaluate negative power of zero"
The error is as follows: Attempt to evaluate negative power of zero. - Function: ^ Failed to evaluate expression. - Expression:...
View ArticleNew user - Electrodes and neuron models
Hi everyone. I am a very new user of COMSOL, and I have a few basic questions about the modelling I want to do. I am trying to model a region of the brain (that is, a collection of neurons), and how it...
View ArticleHow to loop simulations in Comsol 4.2a with Matlab
Dear comsolers, here is an example on how to loop simulations. I'll let you decode it. 'Preprocessing' that I did before the loop: 1. Build a model in Comsol (attached). 2. Save As Model M-File...
View ArticleEffect of temperature on SAW devices
Hi, I'm trying to simulate the effect of temperature on Surface Acoustic Waves (SAW) devices . I'm using the module "Piezoelectric devices" and so I get the response of the admittance in a certain...
View ArticleFinal Abstract Submission Deadline for COMSOL Conference 2013 Boston - 2...
Dear COMSOL Users, The Final Abstract Submission deadline for the COMSOL Conference 2013 Boston is only two weeks from today, Friday August 2nd! Show the modeling and simulation community what you are...
View ArticleNormalize field by value of the same field
Hi there, what I'm trying to do is to divide the normE field that comes from a double parametric sweep solution by a (local) maximum of the same field, at best without exporting the data. It's a 2D...
View ArticleInserting Force into Comsol
Hi, My model is a simple hollow cylinder and i'm trying to apply forces on the inner surface of this model. Forces are in the form of a 12000-by-48 double array. Which 12000 is time steps and 48 is the...
View ArticleConvection-diffusion equation and/or advection equation: incorrect solutions
Hi, I have been working with the convection-diffusion module of the COMSOL Multiphysics module (version 4.3a). I want to study how a charge density (a cloud of electrons) drifts horizontally and...
View Articlesimulation of deformation after removing fixed constraints
Dear all, I want to simulation the final deformation of a plate after removal of its bottom fixed contraint I have a solid plate with its bottom fixed to the ground. Its temperature changes from 70...
View ArticleAutomatic plot and export of parametric analysis
Hello, I'm using V4.2. I was wondering if there is a way to automatically plot and export the results of a parametric simulation one plot at a time. For example, if I have a 2D plot of a the potential...
View Articlelinear elasticity equation
how can I enter linear elasticity equation in using PDE equation?
View ArticleFailed to find a solution for the initial parameter. Segregated group 3
Hi, This is what I got the error message while I start to run 3D model of PEMFC which is already predefined by comsol. The predefined model itself showing error message while running. Plz suggest....
View ArticleFailed to find a solution for the initial parameter. Segregated group 3
Hi, This is wat the error message I got when I run predefined 3D model of PEMFC from model library. Can anyone suggest whether I can run the existing model of PEMFC from model library? If I get the...
View Articleslide film damping
Hi, I am trying to model slide film damping into my comp capacitive accelerometer. COMSOL already has a model for squeezed film damping. What are the changes I need to make in order to model slide film...
View ArticleFSI Load equation
Dear Expert, I want to model FSI problem with piezaelectric and i have load and deflection on diaphragm and i have displacment and i want tranfer that load to fluid i am confused that which equation or...
View ArticleFSI Load equation
Dear Expert, I want to model FSI problem with piezoelectric and i have load and deflection on diaphragm and i have displacement and i want transfer that load to fluid i am confused that which equation...
View Article2d natural convection
hello everybody, im trying to simulate an inductive heating of a cylinder, my problem is that i cant add the natural convection (between air and the cylinder) i've tried to add an outflow BC but i cant...
View ArticleLiquid Crystal - Director distribution
Hello, I would like to calculate the director distribution of liquid crystals. The formula fs=1/2(K11*(div n)^2 + K22*(n * rot n + q0)^2 +K33* |(n x rot n)|^2) describes the Oseen-Frank free energy...
View Articlehow to definite infinite thickness layer ????
hello, I simulate dual gratings by RF Module . But I do not know how to dedine infinite layer. I want to set a port as the light source in the top of the module. The material of the first layer is...
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