model works with identity pairs but not with contact pairs
Any tips on what I am doing wrong in the attached axisymmetric model involving a titanium part with a rounded top that supports a nylon liner that fits inside a titanium "cap"? An approximate image of...
View ArticleScttering problem using comsol4.2
I wanted to calculate scattering absorption cross section and thereby extinction for a nanoparticle. I am not sure how to go for that in comsol4.2. Can anyone please tell a basic flow to accomplish...
View Articlea time dependent matlab function
Hi I'm trying to make a time dependent time function to input as a boundary condition in comsol. I have a vector in matlab and each line is applied in a determinated sampling time in the boundary...
View Articlemodeling a torque measurement setup
Dear All, I am modeling a test setup that is used to measure the torque of a rather unconventional electrical machine called the lateral stator machine. You can see this machine in the attached file....
View ArticleHerschel-bulkley
Hi I'm trying to understand how can i define shear stress parameters for Herschel-bulkley model in Comsol 4.2a The stress expression for this model is: stress = yield stress+m*(shear rate)^n Any...
View ArticleBoundary conditions for strain based loading
Hi, I would like to perform a loading on a 2D specimen using Comsol to obtain a stress-strain curve for shape memory alloy (using the Ginzburg-Laundau model). To obtain the stress-strain curve...
View ArticleSwitched reluctance motor - rotor and stator deformation - How?
Hi. I am building a 2D model in which I would like to showcase how the stator and especially the rotor of a switched reluctance motor deforms because of the radial and tangential magnetic force on the...
View ArticleHelp : Problem facing in opening large file / out of memory processing
I have my simulation file of size 1.5 GB where I am unable to see the results as it is showing "Out of mesh processing" when I am trying to see the plot ( 2D / 3D) etc. Can anyone tell me the shortcut...
View ArticleConstraint for zero velocity in multiphase flow
Hi I am modeling ice formation in a droplet using multiphase flow. The method is based on the fact that when ice phase is formed, I increase the viscosity. The model works perfectly, however, although...
View ArticleWhere to find the definition of "First principal strain" definition formula?
Hello everyone! I am using Comsol 3.5a. I have a question about first principal striain definition in Stucture mechanics module. From "Physics - Equation system - Subdomain Settings", we can see all...
View ArticleLivelink timeout issue
I am having issues with Comsol with Matlab. My loop keeps stopping and I cannot figure out what the problem is. I am clearing out the answer and the model after each iteration. The error is listed...
View ArticleIn parametric sweep, is it possible to use the eigenfrequency of last...
Hi, I'm doing a parametric sweep over some parameter (kx). For each value of kx, I trying to find one eigenfrequency. But my problem is that I want to use the solution for the previous value of kx as...
View ArticleBoundary current source vs electric potential source
Hello, I have a question about the AC/DC module -> Electric currents. I made a simple model of a spherical homogenous volume conductor. Inside this sphere I added a cylinder along the 3-axes. On the...
View ArticleNegative port impedance
Hi All, I am currently doing some antenna modeling. The antenna is excited by a 50 Ohm coaxial port. I get reasonable S11 results at resonance but the lumped port impedance is negative e.g. -5 Ohms....
View ArticlePolydisperse particules
Does anyone know how to implement polydisperse particles in the particule tracing module of COMSOL?
View ArticleUrgent: Eulerian mesh
Hi everybody, there is an euleriam mesh in Comsol.4 ?. If yes, can someone help me to know how can I use it ? thx in advance.
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
View ArticleAbout coupling Richards Equation
Dear Sir: I want to coupling two Richards equation exactly on the same Geometry, to represent two different subsurface flow with different velocity, and define a function as a source sink term depend...
View Articlehelp me to find how to get exact values from model
Dear all , I simulated two coil system in induction coupling , and i define parameters and formulas in parameters section , but i dont know how to derive practical values by applying same formula in...
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