constant volume while deforming one boundary
Hello everyone Does anyone know how to implement a zero volume change constraint on a 2D geometry with one surface deforming? I am using ALE interface and I am prescribing a mesh displacement on one...
View ArticleTriphasic Material - Confined Compression
Hi, I have been using Comsol for 2 years now, for the past few weeks I have been trying to implement a mechano-electrochemical model, also know as the triphasic model to study the effects of mechanical...
View Article"zero length" element
I am trying to model a bolt connection in an assembly. In order to do so I would like to place a node at the center of where the bolt hole should be (all bolt hole cutouts have been eliminated) and...
View ArticleAbsorbing boundary for acoustics
Dear all. I am trying to simulate a acoustics wave propagating through the air. The absorbing boundary that I set is "Matched Boundary". Is this a correct setting? The result went weird when the...
View ArticleWork on COMSOL through MATLAB?
Hi, I would like to run COMSOL through MATLAB but don't understand how? For example when I have saved a COMSOL simulation as M-file and tries to open it in MATLAB it won't open and I am not sure how to...
View Articlelarger ICP model causing problems - singularity error
Hey, I am using your thermal_plasma model as a basis to my model. It is almost the same. The only difference is that in my model the tube is straight (not curved) and longer (0.8 m). These are the...
View ArticleImporting real data heat flux boundary condition to COMSOL
Hello all, I'm working on a 2D transient heat transfer project and I can't figure out how to import real data for heat flux vs.time in COMSOL. It only allow me to input a fix value or function, not...
View Articlecomsol 4.2a with matlab R2011a
Hi, I saved the comsol file in matlab as told. The tutorial says open ''COMSOL with MATLAB''. What does that mean? Also i get an error as follows when i run the m file of the comsol model. Undefined...
View ArticleCreep - Plasticity
I want to use the non-linear structural mechanics module for simulation of plastic deformation by yielding. There is a creep module and a plasticity module. In the creep module, I find more suitable...
View ArticleElectric potential and current density analysis
Dear friends, I analyzed a model using Time-dependent solver and for the time: range (0, 0.016,1). The model is consisted of different layers with different conductivity and permittivity and a Terminal...
View ArticleUnable to implement moment on the system!
Hi, I am simulating a model of a structure which has a central rotating shaft and other components attached to it. The shaft is rotating by a motor and hence the other components should rotate with it...
View ArticlePlot
Hi everybody I simulate the rib waveguide with mode analysis and in picture i attack it ,is a 3D plot. I want to convert it to 1D plot in x and y direction.How can i do it?I think it is so easy but i...
View ArticleInstallation error
Hi, I am trying to install 4.3b version. After installation and starting up the program I get the following error: License error -15.
View Articlethe best way to implement the anisotropic PML
For my master degree thesis, I’m doing some simulations on photonic bandgap fibers and I would ask you information on the PML. In particular, I'd like to know which is the best way to implement the...
View ArticleHelp for a better 3D mesh
Hello! I am a beginner in COMSOL and i need some help with a 3 D mesh! In my model i have to focus on the cylinders and around them. So i need finer mesh for this area but coarser mesh for the rest in...
View Articleacoustic and structure deflection couple field
hi, I am interested in finding out the sound pressure generation when we release pressurized air on the diaphragm of pressure(air) horn, Till now i have modeled 3d model of air horn, plz suggest me...
View ArticleAre the variables in the equation view vectors or scalars?
Hi! When I click the show button and select the equation view in the RFmodule,from the equation view we can see many variables.I think these variables can be used espesially in the data...
View ArticleHeat flux inside the multilayer structure.
How to set the heat flux at the boundary between two layers of material? As in the picture.
View ArticlePDE-interface, implementation of a 'jump' in the dependent variables at a...
Dear COMSOL-community, currently I am trying to implement a model (in COMSOL 4.3a) in order to simulate the injection of spin currents from a ferromagnet into a semiconductor via a tunnel barrier. The...
View Articlecan i use the lambda while solving eigenvalue
version 4.3a the equation in COMSOL is like: lambda^2*ea*U-lambda*da*U+...... however, in my equation, there is lambda not in the first two items in the above equation, for example, there is also...
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