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 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 Articlecalculation of surface curvature, surface tension
Hello every body, I've a 2-D model in Comsol 4.2a where I use PDE and a moving mesh interface. I need to calculate the surface curvature on a boundary. I don't know how to do this accurately in Comsol....
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 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 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 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 ArticleVolume Current Density Modelling
Dear all, I want to calculate radiation of an impressed volume current density in "frequency domain", but I couldn't find a way to place an impressed volume current density in COMSOL. I want to know if...
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 ArticleBolted Langevin (ultrasonic) transducer
Hi, I am just started with the use of comsol, I improved/corrected my model many times, but there is one problem I can't solve. I am trying to model a ultrasonic transducer to get its frequency...
View ArticleHow to calculate the confinement loss of the photonc crystal fiber
Hi, I am using the RF module to do some calculations of fiber. And I don't know how to calculate the confinement loss in fiber. I found that some people said the PML will be used to do this on this...
View ArticleExpression for Sherwood Number
Hi all, I'm looking to use the Sherwood Number for grid independence of a mass transport simulation, but am unsure what expression I should use in the plot. Has anyone ever written one before, or have...
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 ArticleEigenvalue analysis " Mass matrix is zero"
I am trying to run a Static Eigenvalue analysis of a structure . My model is a stone-building , so i just enter the properties of the material and the constraints . When i solve the problem appears the...
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