mechanical 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 Articleabout error in value getting
Dear all , I am doing simulation on inductive coupling , taking two coils , one with six turns , another with single turn , I am exiciting my coil by voltage at 320 V , and i am observing the flux and...
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...
View ArticleGlobal parameters vs. Model/Definitions/Variables
It seems that the geometry can only be defined by global parameters while the rest of the modeling can also use variables. Is there a way to access the model variables in the geometry such as...
View ArticleCalculated initial values NOT the same as specified
I have seen this now in 2 simulations... The initial values specified in Initial Value Domain nodes are NOT the Initial Values the solver ouputs, either at t=0 of the solution nor when asking the "Get...
View ArticleInitial carrier concentration of diode example
Dear Comsol users I'm trying to solve the semiconductor diode example from the model library under no applied bias. I'm only interested in the carrier distribution in equilibrium for now. 1) In the...
View Articleyield stress
Hi I'm trying to understand how can i define yield sterss for a bingham plastic material in COMSOL. The stress expression for this model is: shear stress = yield stress+m*(shear rate) Any comments on...
View ArticleCreating Geometric Entity from Iso Surface
Is there a way to create a geometric 3D entity from a region in the results that has a solved field value that is less than or equal to some constant? In this way I could conveniently do averages over...
View ArticleModeling an acoustic t-junction
Hello, I am currently trying to model an acoustic t-junction with the frequency domain acoustic pressure module. But while the 3D simulation gives me reasonable results I only get nonsense from the 2D...
View Articletime and position dependent reaction
Hello everyone, i am very new to this and not sure which moduls of the comsol software are needed to solve my problem. there will be a phase change with heat production(white box-> black box in the...
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