Fuel tank simulation
Hi, I have a project about fuel tank simulation. The thing that I try is similar to the sloshing tank example. However, since the fuel tanks are closed [ :) ] I need to limit the deforming mesh. Has...
View ArticleCan't use variable defined in 'Global Definitions' within a Waveform definition
I have defined 'tau' in Global Definitions as a variable = 40000*3600*24*365.25[s] I have created a Waveform also in Global Definitions (and in local definitions just to check), with angular frequency...
View ArticleAttributes for each region, integration over region
Greetings, I am new to Comsol and tried to see if a similar discussion has been carried out before without luck. I have a magnetostatic model with several regions (windings). I need to connect...
View ArticlePrincipal stress 2d vs 3d
Hi everyone, I have the same model made in 2d and 3d. First and second pricipal stresses are similiar in both models. But third principal stress in 2d are unrealistically high, however in 3d have value...
View Articlevibrating rod
Hi, I have a coil and inside a rod. The rod vibrate with a given frequency. Knows somebody how could this in Comsol ? In help are some materials about vibrating membrane but I don't know exactly to...
View ArticleRelative Tolerance
Hi I have done some simulations and the intial values used are the default ones. I was wondering when does initial values are important? Is it important to set the relative tolerance for a problem...
View ArticleJoule heating
Hello, I am trying to study the joule heating by applying a current density to a material (simple block). I know how to do this by applying a ground and potential boundaries to the block (making a...
View Articlemechanical vibrations
Hi, What kind of Module are used in Comsol to study mechanical vibrations ? Thanks, CR
View ArticleUsing data from comsol in matlab simulink
Hi, I am trying to use elecromagnetic fields calculated in comsol in my simulink program, I have been using comsol 3.5 before, and just used fem export and S-function in matlab to to this. But I have...
View Articlemembrane cfd
hi.i working on the modelling of one hollow fiber membrane with large length.i run the model sucsesfully. but when i want to select a cut plane the system shows the 'out of memory -when xmesh...
View ArticleHow to justify the internal heat generation in comsol???
hi every one, i am using comsol 4.1. i want to give a internal heat generation on rectangle..how can justify internal heat generation in comsol any one help me?? thanking you, parma
View ArticleUrgent research problem: How to solve PDE systems( 2 PDEs 2 unknown u1,u2...
1.Each PDE is composed of u1,u2. How to set up the coupling process? 2. The spatial dependence for this problem can be reduced to 1D. du/dx But it is a 2D rectangle. The laplcian operator will also...
View ArticleChanging geometry of a model
Hi all, I am relatively new to comsol and I am looking for help. I am trying to adjust the geometry of on of demo models. It is model 114, the semiconductor diode. I want a more symmetric model. First,...
View ArticleModeling a Diode
Hi, I am trying to follow the example of semiconductor diode available in:www.comsol.com/showroom/documentation/model/114/ in a COMSOL 4.2. I believe that I have followed exactly what is describe in...
View Articlehow to understand the code of comsol in matlab editor.
how can i understand the code of programme that is developed with the help of COMSOL and saved as m file and now it is obtained in COMSOL MATLAB editor. how to get to know the curve it shows belongs to...
View ArticleNo eigenpair solution selected
I am getting this error message - "No eigenpair solution selected " when I hit compute. Can someone please help me solve it. Thanks, Rohan
View Articlepredescribed displacement equals displacement value at certain point
hi guys, I'm pretty new to Comsol and i'm trying to implement a certain kind of boundary condition. Perhaps there is an easy solution to this, but i can't figure it out. My Problem is that i want to...
View ArticleEquilibrium condition for an identity pair
Hi. I am new in COMSOL and I am checking for the software abilities. Currently I am using the identity pair in a mass transfer model. The idea is a fluid flowing on the surface of a slab, which is...
View ArticleCacluate power exchanged between solid/fluid and solid/solid
Dear all, I've solved a coupled linear elasto-acoustic model using COMSOL's Acoustic-Solid Interaction module. During the post-processing I would like to calculate energy balances to better analyze the...
View ArticleModeling aluminum plate heating
Hi. I am lost and need some help. I need to modeling the following case: The heating suffer by an aluminum plate that it is illuminated by a lamp formed by a matrix of 7x7 leds with a total power of 49...
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