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...
View ArticleUsing 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:...
View ArticleLaminar 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...
View ArticleParametric 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...
View ArticleNew 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...
View ArticleBrinkman 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...
View ArticleThermoelectric 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 ?...
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 ArticleFree 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,...
View ArticleMagnetic 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...
View ArticleWhat is convergence?
I'd just like to know what convergence is - in the context of COMSOL.
View ArticleSolidworks 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...
View ArticleMagnetic-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...
View ArticleDe-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:...
View ArticleError 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...
View ArticleQuestion 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...
View Articlecomsol 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...
View Article2D 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...
View ArticleWedge-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 ?
View ArticleExport 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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