Editing Heat source equation in 4.1
Hello, I have to heat a solid 5mm diameter sample using laser. I was succefull in siulating a source at the surface and ged a good temperature distribution. But I would like to include another term....
View ArticleCan I do Cluster Computing in Trial Version of 4.3a
I have been trying to do cluster computing after adding a parametric sweep successfully in trial version of 4.3a. The advanced study options is selected and in the job configurations, i could not find...
View ArticleWhich Physics to choose?
Hello Friends, I am trying to apply voltage and wish to check the conductivity in the dielectric material, which physics should i choose??? Thanks in advance
View ArticleHow to apply AC voltage on two capacitor plates.
Dear All Hope you will be fine. I am beginer in the comsol, i want to model the electric field in two parallel plate capacitor by applying AC voltage to it and to see the electric field. I don't know...
View Articlewhere can i find the error message in the help documents of comsol4.1?
Dear all, An error occured saying that undefined value found! where can i find the relevant explanation for this error? Regards Song
View Articleintensity in acoustic
Re: Hi when you start with COMSOL try to use only 1 physics at the time, test yourmodel physics by physics, once you have got the 3 fundamental physics working alone (with fixed values for the...
View ArticleConductive Media DC model with incorrect result after changing boundary...
Hello COMSOL Community, I´m working on a 3D Conductive Media DC model of a probe which is used for geoelectrical measurements. The probe consists of a 4 electrodes array. At the outer electrodes...
View ArticleOut-of-core MUMPS
Hi, I have a question related to the "out-of-core" option. Suppose I have 32GB of RAM available, which is the best approach to use to solve a strongly coupled problem with around 2 millions DoF? 1)...
View ArticleDerivative with respect to parametric sweep Variable
Hello, I am having troubles to get a derivative of a Variable which does not directly depend on a sweep parameter. For Example: Variable: A1=intop1(rmm.Az)/Surface Now I define a sweep parameter called...
View ArticleBreakdown voltage of parallel capacitor.
Hi there. I am designing a simulation of the breakdown voltage of a parallel capacitor. So what I'm trying to figure out is, how the easiest way to to this is. For starters I guess it could be...
View ArticleIs there an easy way to create a high number of geometric components with a...
Hi all, I am using COMSOL 4.3 to simulate a 2D photonic crystal waveguide made of air holes in a dielectric (using the emw study of the RF module), and I wish to look at how roughness around the holes...
View ArticleStep function
Very simple question, but I can't find out how to do it. I have a external temperature, "Temperature 1", which is 100 C. After 330 seconds I would like it to drop 80 degrees to 20 degrees. I should be...
View ArticleHow to use deformed mesh ?
Hi, I want to simulate two physics sequentially: the first one is solid mechanics and the second one is electrostatic. My geometry is simply two parallel plates and want to sweep of the force and get...
View ArticleError: Parameter lists gives empty sweep
Hello, I would like to know the reasoning behind this error in return of a monotonously incresing series of frequencies. Examples: a) 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90,...
View ArticleLight/Heating in tooth
Hi all! (Hi Ivar!) I am currently trying to modelise the transformation of light into heat within a tooth. (You shine the tooth, and some light is transformed into heat by absorption) I have...
View Articlemphgeom(model) for JavaAPI
Hi everyone, does anyone know the name of the function for the JavaAPI to displaying the geometry of a loaded model? for matlab there is one called mphgeom(model), but I'm looking for the java. Thanks...
View ArticleError:-18, COMSOL with MATLAB
Dear COMSOL Experts, When I run my own created model using COMSOL LIVELINK with MATLAB, COMSOL with MATLAB window shows an error:-18. After all the commands in the function scripts are executed, it...
View Articlefrequency-dependent material - with coupled physics
Hi, In the RF module, I have two EMW physics (emw1, emw2) with user-defined frequencies, f1 and f2, which are fully coupled and solved simultaneously in the frequency domain. So for example,...
View ArticleHow to change mouse controls
Is there a way to change the default mouse controls for the model viewing window? I use Solidworks extensively and am very used to pressing mouse3 to rotate the model and the scroll wheel to zoom....
View ArticleLaminar and turbulent flow in pipes
Hi All, I am trying to model fluid flow and heat transfer in a pipe for different fluid velocities. for Reynolds numbers < 2300 I use navier-stokes equations for laminar flow and for Re>2300 I...
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