Sector symmetry on a 1/5 3D electro motor
Hi All, i have a 3D model that shows only 1/5 of whole motor. It has 3 phase and 5 pool pairs. i'm using rotary machinery modul 3D. if i disabled all continuity BC on the outer slice surface, it...
View ArticleVariable exchange between Matlab and Comsol
Hello everyone, I am running Comsol using the LiveLink with Matlab and am trying to do the following: I have a value, dt, which is 0 everywhere in the beginning. (I can either use dt=0, make an...
View ArticleCombination of Fluid Flow and Heat Transfer
Hello everyone, I am a new member of this forum and also a fresh user of COMSOL. I hope I will be able to learn from and discuss problems with all of you. My first enquiry to the forum follows: My...
View ArticleHow to use user defined functions as physics's input? Thanks!
Hello, every one! I am learnging to use COMSOL4.2 and want to add AC signal as my device's input. Just as Eric told me to write an equation as the input....
View ArticleImporting a file from AutoCAD to COMSOL
I have created a 3D building model on AutoCAD and wish to import it to COMSOL for CFD analysis. Can I know the process for importing?
View Articleconvective heat flux magnitude
Hi , I'm computing heat transfer from a rotating hot sphere in a fluid medium. The flow is creeping type. I have issues related to the various COMSOL options for convective, conductive and total heat...
View ArticleBuilding a mesh having in a thin gap in between two beams
I am using the piezoelectric devices interface (pzd). Some layers are linear elastic and other - piezoelectric. The surrounding block is air and I defined it with the electrical material model. I want...
View ArticleLiveLink
Dear sir, Is there a LiveLink extension in COMSOL 3.4 version for importing files from AutoCAD to COMSOL?? Please help me out how to find it in my installation?? Thank You...
View Articlesolvers in 4.3a/4.3 version
Hello I am interested in accesing solver information for ODE/PDE in Comsol. So far I was using the Matlab - COMSOL connection in 3.5 version which was showing a sequence like: fem.sol=femtime(fem, ......
View ArticleIce melting
Hello, I am new to comsol and i am using comsol 4.2a. I have to create a model for melting ice on steel block of dimensions 0.1 X 0.1 m. This steel block is placed over a slab of dimensions 0.3 x 0.5m....
View ArticleUnexpected results with "Ground" BC
Hello, I do most of my modelling using electrostatics steady-state solutions. One thing that comes up in my models alot is a grounded metal object in a linear, vertical electric field as shown in the...
View Articlepost-processing (plotting)
hello, after a biphasic flow simulation "drop flows in other fluid" i hoped plotting my results, but i could not, beacause what i wanna draw it's a user difined characteristic, and i don't know how to...
View ArticleEffect of sound pressure on refractive index/density
Hello fellow Comsol users, Most of my experience comes from structural mechanics and fracture and would like to ask a little help regarding pressure acoustics. The presence of high and low pressure in...
View ArticleTwo interdependent studies - but I cannot use results from frequency domain...
Dear all, How can I use the result from a parametric (parameter 'b') sweep-frequency domain study (e.g. emw.Ez(b) ) in another function defined under Definitions (e.g. f(emw.Ez(b)) ) which is used as...
View ArticleRadiation in conjugate heat transfer
Hello all, I have the CFD module and am using conjugate heat transfer. This means that I don't have surface to surface radiation but I do however have surface to ambient radiation. I am modelling...
View ArticleScattering Cross Section
Hello All, I am trying to find the best way to calculate the scattering cross section in COMSOL for a 2-D cylinder. I eventually will move to 3-D spheres and cylinders. What I have is a circle of 30 nm...
View Article2D Model Problem...
Hi all, I'm working on a model which is a 2D representation of a solid container in a multiphase-flow section. what I'm trying to model is to study the relation between the contact angle and the ratio...
View ArticleSurface Integration with different modes
Hi all, I have calculated the results for the different transverse modes in an optical waveguide using the Mode Analysis solver in the RF module. Now I want to perform a surface integration across one...
View ArticleStructure with 2D and a 1D truss...
Hello all, I am trying to implement this (see attachment). I guess it should be relatively easy, and for sure lots of people know how to do it :). After "spending" quite a lot of time, I decide to...
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