Polynomial Issue with User-defined Variables
I have a 2D rectangular geometry that has porosity and permeability values dependent on x-coordinate. Polynomial expressions are used to define the local porosity and permeability. However, COMSOL does...
View ArticlePML for infinite layered films
Dear folks, I am trying to simulate a point source illuminating on a stacked films extending to infinite. A intuitive way to truncate the film, I think, is to use PML. However, when extending the...
View ArticleUse eigenfrequency found in study 1 as a parameter in study 2
Hello all, My simulation is divided into 2 studies: Study 1: Eigenfrequency (model: solid1) Study 2: Frequency domain (model: solid2) Have you an idea how to use one of the eigenfrequencies found in...
View ArticleWhat COMSOL Module is Needed for a "fluid-structure interaction" model?
Just a quick question here... What COMSOL Module is Needed for a "fluid-structure interaction" model? Can one perform this is the "Microfluidics Module"? Or, does one need the "Structural Mechanics...
View ArticleInitial Concentration in Reacting Flow in Porous Media
Hello, I need to know if I can add a starting concentration for a variable in the Reacting Flow in Porous Media, that will then change via the Reactions Node. The Initial Values Node does not seem to...
View Articleexport as _real_ vector graphic
Hi, I'm not satisfied at all with the image export capabilities of COMSOL. I just want to have real vector graphics. There is a possibilty to export graphics as vector graphics (eps-file), but this is...
View ArticleInstallation problems on Ubuntu 11.04: Failed to load libjvm.so
Hi, I have problems installing COMSOL 4.2a under Linux. I mounted the .iso file as indicated, but when i run setup, i get the following error message: Failed to load the JNI shared library...
View ArticleElectrostatic Actuation with COMSOL Multiphysics
Hi, I am looking for this webinar from 2011 Electrostatic Actuation with COMSOL Multiphysics promoted by IEEE / comsol (spectrum.ieee.org/webinar/1927822) Any idea where I can find a copy? Thanks for help
View ArticleMoving Mesh problem/ Electromagnetism / Induction heating of rod
Dear Ivar, I am working over a problem, induction heating of a rod moving inside the furnace with a certain velocity, required to relieve stress from the surface. The furnace is stationary, means the...
View ArticleAC/DC training courses in Phoenix, AZ and Burlington, MA
An invitation is open for our Discussion Forum readers! You are invited to attend one of our upcoming AC/DC focused training courses that will take place within the next few weeks. The first course...
View ArticleParametric Sweep in order to change the location of a point
Hi, I'm using the Parametric Sweep in order to change the location of a point who separate edge into two lengths; each has a different boundary condition. (One defined by me and the other one is the...
View ArticleLoad materials from library with Java API
Hello COMSOL aficianados, We are working with the Java API for COMSOL here. Let's say you want to load the material copper into your model. It seems, according to the manual, that the only way to get...
View ArticleHow to display "Cut Point 3D" data sets?
Hi there, I want to simulate and visualize discrete measurement points which I import from another application as distinguished "Point" objects in the geometry of my 3D-model. So far I've created a...
View ArticleHow to calculate the impedance
Hi everyone, I'm trying to calculate the impedance after feeding my set-up with a constant voltage. As I have frequency-dependent parameters (relative permittivity and conductance), I expect complex...
View ArticleSegregated Solver
Hello, I was wondering if someone could perhaps explain to me the nature of the segregated solver so that I may understand it a little more clearly. I have seen other threads discussing this in the...
View ArticleCommunication between Comsol and Matlab
Hello Forum, I encounter a problem when I try to use a Matlab function within Comsol. I can plot the function in Comsol. But when I try to run the study, I receive the error attached: "Failure loading...
View ArticlePlotting Problems
I try to plot the following structure: dat=mpheval(out,'solid.E','dataset','dset1') dat = expr: {'solid.E'} d1: [1x8856 double] p: [2x8856 double] t: [3x17334 int32] ve: [8856x1 int32] unit: {'Pa'}...
View ArticleWhile Loops and Converge Criteria for pseudo steady state model
Hello, I am attempting to create a series of simulations whose aim it is to examine the influence of my model's physics on the models geometry. What I have is a vascular geometry , which has a certain...
View ArticleLaplace operator for domain probe---2D axisymmetric tissue-vessel oxygen...
Hi all, I have been learning to use COMSOL for some time, but this is my first time to join this community. I have few questions about using Laplace operator in the domain probe function. I am...
View ArticlePipe Flow-multifluid distillation
Problem consists of 1 inlet pipe with high viscosity fluid. Through distillation process oulet pipes conists of fluids of different viscosities and densities. Has anyone handled this type of problem?...
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