Porous Monolith in a pipe
Dear All, i'm studying heat transfer in a pipe where there is a SiC monolith surrounded by an insulating mat (see screenshot). Up to now I have studied the system considering the monolith as pure solid...
View Articleelectric field and potential distribution
Hi I have been working on a 3D (AC/DC) model of a insulator, and I am trying to verify the uniform potential and field distribution along the insulator surface. I apply 33Kv voltage at HV end. I got...
View Articlecalling a waveform from Definition node
Dear all, I want to apply AC voltage to an electrode. I built my desired stimulation waveform from Definition node. How can I call this function? Do I have to enter function name in Electric Current...
View ArticleHow can I define an PML in model solids mechanics ?
I need a help ! I'm using a model of a small rectangle onto a large rectangle 2D axisymmetric to denote of wave propagation I have to put the PML absorbed wave to not be reflects But when i put it and...
View ArticleMultiple 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 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 ArticlePertubation technique in Comsol
Hello all comsol users! I would like to start using Comsol for structural problems including contact mechanics and non linear material behavior. I would like to know how Comsol assembles matrix for...
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 ArticleUniform Magnetic field?
Hi everyone, I am wondering how I can generate a uniform magnetic field in Comsol. Basically, I want to simulate a metal particle moving in this uniform field. Now I am thinking put all the particles...
View Articlehelp! error about bandgap_photonic_crystal model.
Hello All? when run the bandgap_photonic_crystal example in RF model,the following error maybe appear at times. Error: Failed to find a solution for all parameters, even when using the minimum...
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 ArticleHi: need help on electro-rotation studies
Hi I work on electro-rotation studies through dielectrophoresis(DEP). Problem involves lot of variables, however I would like to know a way to obtain rotational simulation due to DEP? Currently we got...
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...
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