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Multiple user in Linux?

Hi, since some time I use Comsol on a Linux machine. Because of some former trouble I changed the directory used for temporary files to my home directory (followwing the advice given in solution number...

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Using a 2D eigenvalue solution as a scattering boundary input in a 3D simulation

Dear all, I have a simulation that solves for a whispering gallery mode in a toroidal geometry. This is done using a 2D PDE solver. This file is attached and is adapted from Mark Oxborrow's work:...

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Laminar Flow +Chemical Reaction

Hi, Can anyone please help me with my model and guide me as to where I am going wrong. I am trying to simulate a simple chemical reaction A+B-->C in a pipe filled with water flowing at laminar...

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Parametric Study making functions

Hi there, I am doing a parametric study with a variable T_initial for a frequency domain simulation for a fixed range of frequencies, this worked well I need now to change the set of frequencies with a...

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New version

I have a model which I created in 4.3a and that ran OK in 4.3a. I have updated to 4.3b today, but the model won't run :( I get various errors including: Failed to evaluate operator Jacobian. Failed to...

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Brinkman Equation; Anisotropic Permeability

Can I specify an anisotropic permeability with COMSOL 4.3a; Subsurface Flow Module; Brinkman Equation? When I go to user defined, I can assign a single value only. I can't enter a tensor or specify...

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Thermoelectric Model

Dear All, I am looking to find and study example models relating to thermoelectric effect modeling using COMSOL. Does anyone have any reference source/model on thermoelectrics which could be used ?...

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Which 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...

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Free and porous media flow 3D simulation - convergence issues

hey all, I was using the free and porous media flow module (fp) to understand flow distribution patterns in my system. in the 2-D form it was working pretty neat. When I scaled it up to a 3D problem,...

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Magnetic flux density

in the model attached i excited the coil by single turn coil domain , but i am getting only the magnetic flux density on first coil only , not reaching the second coil can any one pls solve the problem...

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What is convergence?

I'd just like to know what convergence is - in the context of COMSOL.

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Solidworks model meshing issue

I created geometry of a saddle coil pair in Solidworks and then I imported it to COMSOL using the geometry import option. When I build meshes, it gives error of meshing around edges and corners. COMSOL...

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Magnetic-structural coupled analysis, result not good

This is part of my thesis. I'm trying to simulate the magneto-structural coupled analysis on a magnetic gear. The attached file is a picture of my result. The cylinder consists of permanent magnets and...

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De-icing of wing

Hi, I'm doing simulation of deicing of wing due to heating up sections of the leading edge of the wing. However, when I go through all the boundary set up and run the solution. I get an error:...

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Error in inductor modelling with Magnetic fields interface

Dear all, I'm using the Magnetic fields interface on an inductor model I'm currently working on. The idea is to do a multiphysics coupling with Heat transfer in solids so that I can compare it with...

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Question about "if" function

Hello, I want to add a volume force to NS equation with a special condition. The volume force is like this: H/Re Re is reynolds number. u2 is calculated from convection-diffusion equation and I want to...

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comsol 4.2a with matlab R2011a

Hi, I saved the comsol file in matlab as told. The tutorial says open ''COMSOL with MATLAB''. What does that mean? Also i get an error as follows when i run the m file of the comsol model. Undefined...

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2D Poiseuille flow, wrong solutions?

Hello all COMSOL users! I was solving a simple 2D Poiseuille flow problem on a rectangle domain. I use the "creeping flow" physical model with the "incompressible" option. And I just set the boundary...

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Wedge-on-Mirror !!

Hello,, How can we design a glass wedge layer tend a 0,5 degree angle from a thin layer in the mirror cylindrical at 3D space ?

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Export data as .csv or .dat

Hello, I am working on a 2D transient problem. I have the results and want to post processing them. I can easily export data in those formats(csv or dat) and open in Matlab or Excel. I want to select...

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