AC/DC training courses in Phoenix, AZ and Burlington, MA
An invitation is open for our Discussion Forum readers! You are invited to attend one of our upcoming AC/DC focused training courses that will take place within the next few weeks. The first course...
View ArticleElectromagnet modeling in 3D BH curve&relative permeability
Hi all, at start let me say I am new in Comsol. I am using v 4.0a AC/DC Magnetic Fields. What I am trying to model is type of a magnetic brake. It`s geometry is very similar to plain electromagnet,...
View ArticleNew "Introduction to COMSOL Multiphysics" book now available
Hello, We are pleased to announce that a new version of the "Introduction to COMSOL Multiphysics" book is now available for immediate download...
View ArticleMoving mesh ALE
Hi, I am simulating a moving boundary with ALE method. My program is working fine with a certain geometry, mesh and time, but if I would like to change the geometry or set a larger time, then I get a...
View ArticleElectrical resistance in a structure
hello everybody, I need to have a simulation of electrical potential in 1D beam elements in a structure. I want to give potential to one point of the model and ground to another point and observe the...
View ArticleThermal stress analysis
Hi sir, i have analysed thermal stress by passing the laser beam on rectangular plate (through structural mechanics module).i used stainless steel temp dependent material properties to my simulation. i...
View ArticleCell Convection
Hello! I need some tricks to know how can I simulate my problem. I've got a rectangular cell ( 4cm height, 2,5 width, 3 mm thick) with a dilute suspension in it. I want to investigate the possibile...
View ArticleResistivity change vs deflection
dear all, How to plot the resistivity change of a simple piezoresistor vs deflection of a membrane in a MEMS sensor? thanks
View ArticleCOMSOL compatibility version 4.0 vs. 4.3
Hello, I have been using COMSOL 4.0 until recently (I know it's pretty old but I had no complaint with 4.0) for a microfluidic fuel cell application. Two weeks ago, the license finally expired and I...
View ArticleFluid flow channel in cantilever beam
Hello, My model is the following: a cantilever beam has one longitudinal channel containing a fluid flow. My goal is to find the effects of the fluid flow (viscosity, velocity, size of the channel) on...
View ArticleConstraining principles for 2D axisymmetic model
Hi everyone. Can someone give me a hint about constraining principles for 2D axi model? I know that there is a 3-2-1 rule for 3D models, and 2-1 rule for 2D models. But is there a rule for 2D...
View Article"Reinitializing GUI" for a long time
Hi, when I solve a PDE, it takes a lot of time. I closed the programme with task manager of windows. When I reopen the file, the programme is "reinitializing GUI" . I wait for almost an hour and...
View Articlesaving work done in comsol 4.3a to 4.2
Please can i save a work done in a higher version of COMSOL say 4.3a to a lower version file say 4.2a, so that i will be able to open my 4.3a file in a 4.2a package. This is possible with Ms-office,...
View ArticleSave soltution at stop condition
Hi! How can I force COMSOL to save the solution for the time instant when the stop condition is satisfied? Thank you, Miroslav
View ArticleHow to find temperature variation for a single element in my model
My model has 7 elements as a whole. I am able to plot the temperature variations of the whole model but not for any separate element in the model. I request if somebody helps me know how to plot the...
View ArticleProblem with air as a fluid ;-)
Dear sir, While solving my model, I am getting an error that the "Last time step is not converged" if the air is taken as a fluid whereas it is showing the results when air is taken as a solid. What...
View ArticleTem analysis-Joule Heating and Thermal expansion of wire
Tem analysis Hello, I was using Joule Heating and Thermal Expansion Analysis of Wire Bond. Basically, I would like to apply 2.1 Voltage to the wire and see displacement . However, I am not sure that i...
View ArticleHow to set a compliance current
Hi, I'm relatively new at Comsol. I am working on an electronic model of a NVRAM. I would like to clamp the current within my cell. But I cannot find a easier way than create a transistor that will set...
View ArticleSolve PDE on 1D domain?
Hy guys, I have a problem with solving a PDE based model defined by me, it is not a default template in COMSOL. My problem is that the equation is solved for the time domain, but not for the geometry...
View ArticleConvergence error using batch command line
Hello, I want to solve a single phase fluid flow, turbulent low Reynolds k-epsilon model in batch mode. This works fine when trying to run from the COMSOL desktop (i.e. with GUI). However when I try to...
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