How 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...
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 ArticleCOMSOL models for indirect X-ray imaging
Hi Is anyone aware of COMSOL models that deal with indirect X-ray imaging (i.e. scintillator/phosphor materials that convert X-rays into visible light, e.g. CsI, GADOX..)? I’ve been searching this...
View ArticleCOMSOL models for indirect X-ray imaging
Hi Is anyone aware of COMSOL models that deal with indirect X-ray imaging (i.e. scintillator/phosphor materials that convert X-rays into visible light, e.g. CsI, GADOX..)? I’ve been searching this...
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 ArticleNormalized electrical field??
Hi! I'm looking at modes in a waveguide. To obtain the electrical field of the diffrent modes COMSOL solves an eigenvalueproblem and gives me the egenfrequencis. But how does COMSOL normalize these...
View ArticleRF Mode Analysis Normalization Convention
Hi all, This question is in regards to: RF Module > Electromagnetic Waves > Mode Analysis Does anybody know the normalization convention that is used in the solutions? For example, part of the...
View ArticleNormalize mode's energy
I am designing an optical waveguide, and by using COMSOL I am trying to find its mode. Now, I'd like to normalize the mode's energy. I mean, as you know there is a color bar on the right side of the...
View ArticleIntrinsic stress in Structural Mechanics Module or MEMS Module
Dear all, I'm simulating the stress distribution inside a waveguide that is cause by material having different thermal expansion coefficients. My simulation uses Structural Mechanics module and is...
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 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...
View ArticleFluid flow due to temperature differences
Hello, This is not my strong side so I would appreciate some recommendations. I want to calculate the cooling oil flow in a cylindrical geometry in which there are a number of heat producing elements....
View ArticleLow Reynolds Turbulent Flow
Hi folks, does anyone know what the "spf.wall_spf" variable means in the AKN Low Reynolds k-ep model. I can see it in the equation view, but other than that, there is no more info... I am really trying...
View ArticleProblem coupling heat transfer in fluids and turbulent flow
Hello, Im runing a simulation about a flow that enters a cilindrical reactor by a cilindrical ( smaller radius) cylinder. I had solved the velocity profile with the turbulent flow physics and obtained...
View Articlesaving comsol 4.3 as "fem" variable
Hi: I am wondering if it is possible to save comsol file as "fem" variable so that I can write a small code to extract the fields from fem in order to normalize them. I used to do this in comsol 3.5...
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