Simulation error
Hi , I am getting this type of error whey i am trying to start simulation. "Variables property does not include all variables in Xmesh" Could anybody can give me any solution/ suggestion. Thank you...
View ArticleCFD from stationary to time dipendent
I built a model of pipe in axialsymmetric configuration, with internal laminar flow of water with pre-determinate velocity. The water flow, during its pass, are heating by resistor, simulated as heat...
View ArticleLaminar flow in vertical pipe
Hi, I'm trying to do a simple model of laminar flow in a vertical pipe. The model is coming out fine before I add gravity, but when I add gravity via a Volume force of -9810 N/m^3 in the y direction I...
View ArticleMicrostructure design
While computing, I have got an error which was mentioned like: "The following feature has encountered a problem. - Feature: compile equations: stationary(sol1/st1) - Error: Duplicate variable name....
View ArticleJob option in Batch command
Hi all, I add trouble when using the batch command recently. I prepared one file with a parametric study (different amplitudes are used in a time dependent problem). I didn't try yet the -pname and...
View ArticleWhere is the maximum (or minimum)?
Hello. Does anyone know how to find (not only represent) the coordinates of the max (min) value of a variable, for instance in 3D? I mean, when one plots 'Max/Min Volume' (in a 3D Plot Group / More...
View ArticleUsing deformation results as initial conditions for the next study
Hi all, I have a linear elastic model with a stationary study whereby I apply a boundary load and deform the model domain - this is simple and works fine. Next, I would like to use the deformed results...
View Articleparametric sweep with charged particle tracing
Hello, i have 2 studies in my model: 1) A study that calculates electric and magnetic fields 2) A study that calculates charged particle tracing only with the fields from 1) now i would like to...
View ArticleEquilibrium condition for an identity pair
Hi. I am new in COMSOL and I am checking for the software abilities. Currently I am using the identity pair in a mass transfer model. The idea is a fluid flowing on the surface of a slab, which is...
View ArticleBreakdown voltage of parallel capacitor.
Hi there. I am designing a simulation of the breakdown voltage of a parallel capacitor. So what I'm trying to figure out is, how the easiest way to to this is. For starters I guess it could be...
View Articlemagnetic field -problem with mesh in a frequency domain study
Hello, I have some convergence problem in my 3D study. I build a geophisycal magnetotelluric model, a stratified earth (layers at different electrical conductivity ). I will measure the impadance at...
View ArticleGaussian focused beam, 4.2a
Dear All, I have issue. I have silver block on the glass. I want to illuminate it from the bottom (so light first propagate through the glass), but I want to illuminate it with Gauss focused beam (I do...
View ArticleComposite material anisotropy
Hi, I'm enjoying a few days of trial licence and one capability I wanted to explore is modelling of composite lay-up structures, but I can't find an example model. The one discussion thread I found...
View Articletype of the solver
Hello, I'm simulating a flow in a 2D domain (a square wich contains a small hole). The governing equations are (N-S and mass conservation) and the boundary conditions are : - non slip BC (Dirichlet)...
View Articlecalculate stray capacitance for a 5-turn coil
Hello, I want to calculate the stray capacitance for a 5-turn coil. I use AC/DC module, 2D axisymmetry, stationary study and parametric sweep. There are two questions about this calculation: 1. When I...
View ArticleTransient analysis in COMSOL
When doing a transient analysis (Let’s say heat transfer or fluid flow), you may sometime need very small time step size, though you don’t need the solution for every time step. Recording the solution...
View Articledata export in v4.3
Hello together, due to a reconfiguration of my computer, I had to reinstall Comsol, which only is now available for me as v4.3. The calculations I did already are done in v3.5a. I am able to open the...
View Articleapplying same boundary condition to multiple selections
Hi, I am trying the following thing: Lets say there is a boundary condition, named "Ground1". I want to add 30 selections, defined arbitrarily, to "Ground1" BC. I am not able do this. To do so, I have...
View Articlephase dependent cuurent
hi all how can i induce some phase dependent currents in comsol? especially i wanna know how to make 3 currents with 120 degree different phase
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