COMSOL solver control
Hi, I am looking at a problem that solves physics at two different time scales. Basically, I want to do the following At a coarser time scale I want to solve a few partial differential equations...
View Article[Solved] Selection Left Click
Hello community, I am faced with a strange problem. I just updated to Comsol 4.3 after using 4.2a for a long time. But it seems I can't left-click on an object to select it anymore. I don't know...
View ArticleHow to set materials to geometric objects using MatLab?
Hi, I am quiet new to Comsol. I am activating Comsol server via Matlab interface. I build everything using Matlab commands (LiveLink for Matlab). I am modeling a system of one object (solid) inside...
View ArticleDifficulty in using iterative method for Rf problems which has multiple ports...
Hi everybody, have anybody encountered the problem of keep on having ill conditioned preconditioner when you apply a lot of port condition on a single boundary (For grating structure simulations where...
View ArticleSolving For Total Field with Incoming Plane Wave
I am trying to find the total field for the a substrate with an incident plane wave (i.e. sunlight on a substrate). So far I have made an injection port with a plane wave, but the problem is that I get...
View ArticleNo convergence. Relative timestep too small. Double dogleg solver.
Hello, I am trying to use Double Dogleg Solver for a Navier-Stokes problem, and even tough the residuals in the convergence plot have reach 100% for the velocity and pressure segregated step, I get the...
View ArticleShape not in interpolation curve not preserved
I'm using an interpolation curve as a way to import a 2D geometry into my model. Figure1 shows the shape of the data I wish to import (as shown in Excel). However when I import this data, saved as a...
View ArticleRecoverable error in residual, but solver could not recover.
Recoverable error in residual, but solver could not recover. What is the meaning of this error ?
View Articleregarding the error occured during simulation
Iam designing RF mems switch I got this error while computing Failed to find a solution for the initial parameter. Segregated group 2 System matrix is zero. Returned solution is not converged. Kindly...
View ArticleCOMSOL Releases COMSOL Multiphysics version 4.3a
We at COMSOL are proud to introduce version 4.3a of COMSOL Multiphysics to the COMSOL community See: http://www.comsol.com/products/4.3a/ This introduces: * LiveLink™ for Excel® * LiveLink™ for Solid...
View ArticleEstimated error in the energy norm OR the error norm.
Hello everyone, I am having trouble with something that I can't seem to find any help about in COMSOL support. I only see it mentioned very little and not in very much detail in the help documents. I...
View Article4.3 to 4.2a backwards compatibility??
Hi, i'm just back from the Boston conference and had carried out a bit of work on a model in 4.3 at the demo stations. I'm using 4.2a on my machine and the model won't open, just getting the message;...
View ArticleHow do you know which resonant frequency of the cantilever is the proper one?
Hi, everyone. I'm quite confused. It's a rectangular beam,with one end fixed. Then I do the eigenfrequency study. When I apply different mesh method to the beam, for example, first I use Free...
View ArticleDimension of a exported data array
I have two model, and I need to graph with matlab the difference. I plot with 1D graph a first model, and export the graph; then i plot with 1D graph the second model, and export the graph. My problem...
View ArticleMagnetic Fields, No Current
Hi everyone, So I've been trying for a while now to bypass the problem of creating an external magnetic field in *other* AC/DC modules; but now I see that in the MFNC there are two options: External...
View ArticleCalculation of electrostatic forces
Dear all, I have a querry regarding electrostatic force calculations in comsol 3.5(a). According to the manuals and few tutorials on calculation of electrostatic forces in MEMS module, it seems to me...
View ArticleError : Failed to find consistent initial values
Hi ! I'm trying to simulate a magnetic dipole in time domain but I'm encoutring an error. The model is fonctional in frequency domain but when I use the time dependent study, the progress window shows...
View ArticleFrequency Domain Study
Hi, I'm starting to use Comsol and I'm trying to do a frequency domain study on a poroelastic material subject to a sinusoidal load which frequency is in the range 1 to 100 Hz. My problem is that I...
View ArticleCan't see geometric block when transfer a model from Matlab to Comsol
Hi all, I am running Comsol ver. 4.3 build 4.3.0.151 and Matlab 64 bit ver. r2012a. I want to build a model in Matlab, to run it and then transfer the model from the Comsol server to Comsol client. I...
View ArticleSphere-Sphere Forces
Hello. Firstly, greetings to everyone, I am new here. So, I am trying to build a model based on this article:...
View Article