Webinar - New Features of COMSOL Multiphysics 4.4 - December 12
Hello! Join us for a free webinar tomorrow, December 12th, to learn about what's new in COMSOL Multiphysics 4.4. 2:00pm CET (Paris)www.comsol.com/events/1585/int...on-to-comsol-multiphysics-4-4/ 2:00pm...
View ArticleCOMSOL 4.4 Installation-Error
Hi, I am trying to install COMSOL 4.4 in my machine. I have already installed COMSOL 4.3b and its license manager. I would like to keep 4.3b version in my machine too. When I setup a new license...
View ArticleElectrified fluid...
Hello, I am just getting started with Comsol (4.1) and am attempting to model the shape of a fluid droplet as it is deformed by an externally applied electric field (i.e: electrospray). So far I have...
View ArticleCreating solution objects and assigning values from MATLAB in COMSOL 4...
Hello, I am trying to adapt from COMSOL 3.5a to COMSOL 4, and so far, the biggest functionality that I miss while using the MATLAB connection is the following: I want to be able to create solution...
View Articleparameters names must not be empty
Hey, again, this is an error I ha with comsol 4.3: parameters names must not be empty I need a quick help attached is my comsol file, you just need to run it and see the error. and also i attached a...
View ArticleHow to Export the material data to .mphtxt file?
I am trying to export the data from Comsol. I could get the mesh data if I click the 'mesh export'. But I also need the material data for each mesh cell (tetrahedron). Since I cannot link the Comsol...
View ArticleNeed help in output acoustic pressure in air domain
Hello,everyone I used Pressure acoustic, frequency domain and electromechanics Physics, 2D-axisymmetric to simulate a vibration membrane to get the output pressure in the water domain. The result is...
View ArticleHow to calculate the normal heat flux on a boundary
Hi everyone. I´m a beginner with COMSOL and I don’t understand how it calculates the normal heat flux on a boundary. In order to evaluate how to derive values in the Results section, I have followed...
View ArticleDisk error while writing to to temporary file
When I try to open up larger COMSOL files I get this error. What does it mean and how can I avoid it? I have tried in two different versions of COMSOL (4.3b and 4.4) and get the same error no matter...
View Articlerecover matrix
hello everyone I made a resolution a PDE on COMSOL and I would like to to recover the resolution matrix using Matlab. is that possible? thank you for your help
View ArticlePlotting ratio of displacement
Hi, I am using COMSOL 4.2.1.166, and am simulating a circular membrane as a Structural mechanics 'plate'. I simulate to get the mode shape of the fundamental mode for a uniform load in the normal...
View ArticleBest way to find the average velocity over a cross section of an axisymmetric...
I'm attempting to find the average velocity over a cross section (of an 2d axisymmetric flow profile) vs distance along the flow channel (say z direction) in COMSOL. The only way I can find to do this...
View ArticleMeshing problem
Dear colleagues, I'm modelling a thin walled element (solid geometry) and I want to mesh it with an hexahedral mesh with only one element along the thickness. I attached an image of the geometry. The...
View ArticleUMFPACK
I am using COMSOL 4, I want to solve a nonlinear equation. I can not find UMFPACK in solver list!!! Could you tell me where it is?! Thanks.
View ArticlePiezoelectric Simulation (pzd) in comsol 4p2 for FBAR filter
Hi, There is a parameter in COMSOL 4.2, in piezoelectric simulation, pzd.Y11 which gives you input impedance if you simulate a one port device. I think this correspnds to Y11 parameter of Y matrix. I...
View ArticleGeometric Nonlinearity problem
I have an odd problem. I am trying to recreate the Large Deformation Beam model (www.comsol.com/showroom/documentation/model/204/) before I start my own project to investigate buckling. I was following...
View ArticleRecovering desired eigenfrequencies
Hi, I'm performing an eigenfrequency analysis of a model in the Comsol 4.3a RF module. My problem is that, though I ask for only 1 eigenfrequency, Comsol ALWAYS gives me 2 eigenfrequencies: one purely...
View ArticleMesh Problem
Hello, I have problem with mesh generation for my model. I made a 3D glass beads with lots of grains. When I want to mesh that I faced some error in meshing. sometimes it meshed but then during study...
View ArticleHollow fiber membrane
I want to model hollow fiber membrane, I have a problem with reaction term in tube side. this term changes the continuity equation into nonlinear type. this model has three section; tube, membrane and...
View ArticleMathematical Particle Tracing_Weird results
Hi there! I am posting this thread because I am trying to simulate the deflection of a non magnetic particle in ferrofluids, under the influence of magnetic field. I have simulated the magnetic field...
View Article