Complex permittivity in electric currents physics
This seems like a simple question but I can't find a clear answer in the documentation. I wish to solve for the electric field induced by a conductive particle surrounded by an insulating membrane in...
View ArticleTime consuming post processing
Hi, I'm modelling light interaction with nanoparticle in RF module in frequency domain. I've solved model and exported it to Matlab. Then I was going to do some post processing, like electric field...
View ArticleHeat Transfer in Soils
Hi, I am a comsol user and I want to have a 2d axisymmetric model. In my model, I have a soil sample that I put a steel bar in the soil. I want to heat the steel bar with a constant temperature 500(k)...
View ArticleAdd water & salt to 1 domain
i I would like to know how to add 2 or more materials to a specific geometry, because I add water to domain 1 (liquid) and KCl (liquid ) to domain 1 , the model generates and error that is shown in the...
View ArticleGetting data in MATLAB from COMSOL model
Hello, I am currently trying to read out solution data from a COMSOL model in MATLAB, but everytime I try to run the model in MATLBA I get an error message like this: Starting the COMSOL Multiphysics...
View ArticleConvergence of Solver with Hyperelasticity - Problems
Hello, I've modeled a cantilever beam composed of Magneto-Rheological Elastomers (MAE) that bends when subjected to a magnetic field. The MAE used in the model currently uses a linear elastic material...
View ArticleError: failed to evaluate variable
Hi everyone, I am a new COMSOL user and I tried to model a two phase flow (CO2 and Water) in porous medium. I did so in other software but I got recommendations to try to solved it in COMSOL . As you...
View ArticleVariable synchronous reluctance machine vs synchronous reluctance machine
I have a question regarding the design and the phenomenon of a variable synchronous reluctance machine (VSRM). When designing the rotor, is there a difference between this machine and the synchronous...
View ArticlePDE coefficient form, can coefficients be variable dependent?
Hello, I would like to solve an equation with the PDE interface in Comsol 4.2a. I use coefficient form and wonder if the coefficients can be dependent on the same varaible the equation is solving for?...
View ArticleTransient simulation output doesn't match input
Hi I'm simulating a 2mm radius magnetic loop excited by a transient current and surrounded by a 10cm air sphere, in time dependent study. I've interpolated a gaussian current input from several points...
View ArticleVideo tutorial permanent magnet
Hi everyone! I need calculate permanent magnet field. I am absolute beginner. I can draw geometry but i can not assign material. Could you send me video tutorial step by step demonstrates how to assign...
View ArticleTime varying change in parameter values
Hi. Is there a simple way to define a parameter that varies to known values with time. For example, I have data representing the change in hydraulic head in a well during a pumping test. The hydraulic...
View ArticleIs it possible to use Scilab instead of Matlab?
Hi, did anyone try to use the free available Software Scilab www.scilab.org for interfacing Comsol? Best regards, Stefan
View Articleimporting 2D mesh in comsol ?
Dear All, I am using a geometry imported from CAD and i d like to select a single face and transform it to get only to work in 2D. Basically i d like to solve it in 2D. How can i do to import geometry...
View ArticleHow to stop a runaway simulation?
Hi, I am running simulations automated with matlab scripting. Sometimes the simulations run away (do not converge) and last for ever with a extremly small time step. In such situations one usually hits...
View ArticleWhich solver for time dependent : Electromagnetic Waves + Solid Mechanics
Dear all, I am faced with a tricky problem for me, on which I cannot find a solution in the documentation. My model is representing a polymer that, subjected to some laser beam, expands in illuminanted...
View ArticleRunning multiple processes in cluster nodes
Hello everyone, I have one (split) question about running Comsol 4.1 in a Linux cluster. My model is simple with a large number of parameters to sweep. Therefore it would be most time-efficient to use...
View ArticleMagnetic field
Does anybody know how to write this expression on comsol ( ∇/B/^2 )? I meant expression that replace "the gradient of the magnetic field norm square". Thank you
View Articlequestion about the memory
Hi to everyone, I would like to ask a question about the memory of comsol 4.3. When it formulates the mathematical problem comsol needs to construct some matrices which will result to one or two...
View ArticleHow to install Livelink for Excel?
Hello, I have license for Livelink for Excel and want to use it. I checked with te documentation and there are a lot of chapters starting with "With Livelink for Excel installed, you can do this and...
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