Exporting Comsol data to Matlab?
Hello everybody, I want to postprocess Comsol data in Matlab. Since Ascii files blow up in size and I get "out of memory error", I'm looking for some other way. I've no experience with Comsol-Matlab...
View ArticleWhat should I do 3 phase Generator 2D in Model library
Hi, This example is the single phase Gen. If the single phase Gen can be three phase Gen, How to improve or apply it Vi=NN * L (integration(Ez.dA)) / A This eq from And the Eq can be use with three...
View Articlesolver sequence?
Hi there, I have question about solver sequencing. In the structural mechanics module, I have a structure under some static forces. These forces generate some displacements in the structure but then i...
View ArticleInconsistent Units
Hi, I´m trying to incorporate the following expression on Subdomain expressions: D=0.926*T^2.5/(T*245) the result should be in mm^2/s, but It shows me "Inconsistent Units" even when I try the...
View ArticleModeling flow through a thin channel
Hi, I'm trying to model water flow through a 2D thin channel (8 cm X 2 mm). This is part of my PhD research. The inlet pressure is 1.5 bar, outlet pressure is 1 bar. The walls have a no slip...
View Articleheat transfer simulation
Hi, I am trying to simulate heat transfer of a 3D closed box with a fluid(Nitrogen) inside it and some solid electronic components that are heat sources. Actually I am a little confused with different...
View Articlethermal Diffusion Coefficient or Thermodiffusion
Hi all I am trying to solve a problem of a binary system for the moment using Comsol version 4.3 to study thermal diffusion or thermodiffusion. It consist of solving beside the fluid flow and heat...
View ArticleCapacitance as a function of frequency plot
As the subject, I would like to know how to make plot of Capacitance vs Frequency. I am using AC/DC module and electrostatics study.. moreover, i have computed using stationary step to plot the...
View ArticlePDE mode in comsol 3.5(a)
Hi I want to know that whether we can use PDE mode in axisymmetric geometries in comsol 3.5(a). I think it is not available for axisymmetric geometries and only exist for 2D geometries. When I select...
View Articlea problem in solid mechanics/ study steps /3D model
Hi, I am a beginner of COMSOL. I am trying to modeling a simple case of building a concrete plate on a soil mass, which includes two steps: 1st only the soil, get the initial stress state by gravity...
View Articlestuck with perhaps the simplest problem of thermal expansion
Hi, I am a newbie to COMSOL trying to model thermal expansion of a hollow copper disc from 300K to 500K. I am unsure of which model I should to use as there isn't any heat transfer. It is a steady...
View Articleto extract only the geometrical information after deformation
Hi,everyone! Recently I met with a problem about how to extract only the geometrical information after deformation, meanwhile I want to discard the material and physical information (such as stress,...
View ArticleFluid-Porous Slip boundary conditon
Hello, I focus now on the flow and solute transportation simulation in the free flow and porous media. There are traditionally one singe formulation, typically Brinkman and two-domain coupling with...
View ArticleExporting data for multiple Cut planes
Hi all, I'm modeling a mixer and I would like to export concentration profiles at different cut-planes along the channel. I can do a single cut plane export with: Defining: Data Sets -> Cut Plane -...
View ArticleStudy options
I everybody, I've been using COMSOL for more than a year now, and up until now I had no need to changing anything in the default solver, but now I do. To be more specific, I work in a huge file which...
View ArticleElectronic Invitation to the COMSOL Conference Boston (Oct 3-5) now available!
Hello, The COMSOL Conference is the place to be for getting the most out of your simulation work and connecting with fellow COMSOL users. Know what's coming up next in multiphysics simulation and...
View ArticleError while Running Simulation
Hi, I started getting this error all of a sudden and it says not enough disk space. I have 128GB of free space and still I am getting this error. Does anyone have anyidea about how to resolve it? Kind...
View ArticleMethane/Air
I am trying to model the mixing of methane and air. Since they are both gases, I am having trouble getting the mixing to work. I would use two-phase flow, level set if this was a liquid-gas interface,...
View ArticleWill change relative tolerance results in quite different results?
Hi, I always encounter the problem that "Failed to find a solution. The relative error (0.032) is greater than the relative tolerance. Returned solution is not converged." Usually, I change the...
View ArticleStructures ignore each other upn contact
Hi, I'm new to comsol, just started using it few weeks ago. I'm building a model of capillaries and white blood cells. I tried to fit a sphere inside a tube and make the sphere expand due to internal...
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