What 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 sessile droplet evaporation
Dear Firends, does any one has experience with modeling phase change from liquid to gas ? is there exists any tutorial ? I intended to model evaporation of single droplet pinned of relatively hot...
View Articlenonlinear optic effect
Hi! I'm trying to simulate the nonlinear optic effect in wave propagation. As a result, my refractive index = n_o+n_2*(I). Because intensity I varies, I get a inhomogenous refractive index in the 2D...
View ArticleHysteresis Losses on synchron motor
Hi All, i desperately try to evaluating hysteresis loss in comsol way. there are a few commonly used formulas. i think, the easiest is to measure the area enclosed by the hysteresis loop in a cycle...
View ArticleHelp with design of an RF MEMS DC contact switch
Hi, I am new to COMSOL and i have a project which has to be done in COMSOL. I have to design an RF MEMS DC contact switch. Since i am new to COMSOL, can anyone kindly help me with a tutorial . Or if...
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 ArticleProblem calculating time derivative of plastic strain
Hi, I have encountered a problem when calculating the time derivative of a internal variable solid.epeGp (plastic strain) in elastoplastic model. The model is aimed to investigate the elastoplastic...
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 Articlemesh data
hi anyone can tell me how to get volume of each elements in comsol?, is it possible to get element numbers in comsol?, I hope 'dvol' give the element volume scale factor, from manual I understood its...
View ArticleTime Dependent Analysis of two Coupled Membranes
Hi everyone! I am very new to comsol, so I apologize in advance if my problem is trivial. I have to perform an acoustical simulation with comsol 4.2a. My system is made of two elastic circular...
View ArticleRotating generator with bad inducted voltage
Hi everyone. I am using an old version of Comsol, the 3.5 ! I am trying to simulate a generator with 32 poles and with permanent magnets of NdFeB. Because of this and because i want to simulate it with...
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