[SOLVED] Preferences are not saved in Comsol 4.3a on Windows
The problem story: 1. I went to Options > Preferences > Graphics > Rendering, set it to "Software", because it often crashes with OpenGL on my machine. 2. It says "The program needs to be...
View ArticleElectromagnet design
Hi, I am trying to simulate an electromagnet, consists of two coils and cores, in order to test different core design and materials. In particular, I would like to test for the magnetic field between...
View ArticlePlacing a finite element model into an electrical circuit in COMSOL 4.1
Hello, I have recently made the switch from COMSOL 3.5a to COMSOL 4.1, and I am currently unable to do things that I used to be able to do very easily, namely placing my 3-D model (drawn and defined in...
View ArticlePostprocessing in cyclindrical coordinates
I am doing a plane strain analysis of a pipe with a crack in it. I would like to get the stress components in the cyclindridcal coordinate system (radial, hoop stress) rather than in the cartesian...
View Articlestreamline problem
Hey, i am having some problems creating the steamlines for my Helmholtz coil. I followed the steps for the one of the model on comsol website for Helmholtz coil except other than revolve to create the...
View ArticleI export only S11 as S Parameter what about s12,21,22 ?
Dear memebrs I used the Date Export and then emws11 and when I open my exported file I see only the S11 parameter what about the s12,s22 ?? how can I export them too. See a screen shot of my issue I...
View Articleparticle deformation througn a contrained channel
Hi there, I am doing COMSOL simulation to see the behavior of a particle flow through a microchannel. There is a area of the channel where particle size is greater than the cross section. So the...
View Articleproblem of user defined function
I am using poroelasticity module. I defined a analytic function named G. It is a function of poro.eZ (strain component in z direction), G=f(poro.eZ), and I can plot out the figure of the G(poro.eZ)...
View ArticleHow to restrict the scale of calculation
Well, I'm interested in a model as attached. I'm using the Structural Mechanics Module in order to calculate a deformation at low temperature caused by different thermal expansion coefficients....
View Articlepulsed concentration
Hello, I would like to give a pulsed concentration to my model. Therefore I created a rectangle function rect1. Then I would like to declare my concentratin c_in as variable as rect1(t[1/s])*0.1...
View Articleautomatic remeshing
Hello everybody, I'm trying to use the automatic remeshing function of comsol with the ALE method. This allows to remesh the geometry according to a specific criterion. My problem is that I would like...
View ArticleHow to make two different time ranges periodic in time dependent study
Dear all, I'm trying to simulate a multi-physics model and one of them is heat transfer. I'm giving a pulse heat source where I use periodic rectangle function. I define the pulse duration as "tt" and...
View ArticleInterfacial boundary conditions for structural mechanics module
Hi, Does any one knows how to impose a continuous displacement boundary condition on an interfacial boundary between two geometries in solid stress-strain module of Comsol 3.5(a). Kindest regards
View ArticleFluid Flow in U-loop
Hi everyone, I have modelled a U-loop with water flowing through inside in 3D, with three different sections (two cylindrical lines and one half of a torus at the bottom). But COMSOL only calculates...
View ArticlePost processing
Dear all, every time I edit one parameter of a graph, COMSOL redraw it automatically. Is possible to disable this feature? Thanks
View ArticlePDE and ODE implementation
Hello, I am trying to simulate frost growth on a surface but I face difficulties implementing the equations in PDE and ODE interfaces. Can I have some help ? I attached a .pdf with the equations. Best...
View ArticleSolver Robustness in Joule Heating Model with Field and Temperature Dependent...
Hi there, I am trying to solve a Joule heating problem in 2D axial symmetry. The challenge in this system is the temperature "T" and electric field "E" dependence of the conductivity "sigma" of one of...
View ArticleMeshing problem with very thin Layer, sourrounded by air.
I'm modelling a spiral inductor on a PCB. The height of the copper layer is only 70 µm. Between the turns is an air gap of 200 µm. The inductor is sourrunded by an air domain and an infinite element...
View ArticleControlling my own boundaries
I am modelling a closed tube of air in 3D with a heating plate at one end of the tube. I have measured the temperature distribution across the heating plate as a function of time and location and would...
View ArticleDC Electron Mobility section. In the μdc edit field, type 1E25/mwp.Nn
Hello, in my mwp model there is no mwp.Nn variable? or is there? How can I find out? whenever a variable is not know, it keep in orange, instead of being accepted in black letters. the mw ECR model in...
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