Port Phase
Hi all, I have a question about the port phase in rf module. I noticed that the software accepts 'i' as an argument for the field "port phase". what does that do? if I'im using multiple ports what is...
View ArticleElectromechanics in COMSOL
Hi, I am a student and I have just started using COMSOL. I would like to find out the displacement of a cantilever beam (2-DIMENSIONAL) due to electrostatic force created when 10V of voltage is applied...
View ArticleTrouble modeling magnets
Hello, I am modeling a tool that is two opposing magnets (i.e., north faces north or south faces south), which have a solenoid (copper wire wrapped around a soft iron core) between them. I have...
View ArticleDefining port, identity pair and PML layer
Dear Friend, Currently i am using comsol 4.3 version, i am totally new about it. could you suggest me how can i define port i,identity pair and also PML at same time in my model. it was works nicely in...
View ArticleHelp in COMSOL (LED)
Hi, New to COMSOL here. I am trying to simulate the extraction efficiency of different LED casings (the encapsulation) in COMSOL. Currently I have tried three different geometries: cone, pyramid, and a...
View Articleexpression for analytic function for ferro-fluid
In "magnetic drug" problem, if i actually use the ferro-fluid instead of taking it's mass fraction as 0.1, what would be the expression for analytic function? According to my understanding, we don't...
View ArticleStep index fiber
Hi, In the simulation of step-index fiber if i place a particle beside the core and want to evaluate a line integration of the following equation ----------------...
View ArticleAssigning material (iron, air or...) to the permanent magnet domains in...
Hi, I am modeling a generator in which I have used relative velocity of permanent magnets and coils to generate emf. I have successfully applied magnet properties (magnetization) in the study using a...
View ArticleLinking swept with thets
How can i combine a swept and thet mesh together? Picture shows actually totally my problem :D Im done with the rest and really happy ;)
View Articleslab-waveguide simulation / scattering losses
Hello, I'm attempting to simulate a simple slab waveguide (see attached). The waveguide has a core of n=1.5 surrounded by air (n=1) above and below. This design is surrounded by PML rectangles. The...
View ArticleHow to Improve Convergence in Natural Convection
I am wondering how I can improve convergence in my natural convection model. It is a simple model; an isothermal aluminum plate in water. The model starts out fine but as the run continues (transient...
View ArticleWaveguide amplitude errors, scattering boundary condition
Hello everyone! I am modeling a waveguide with the purpose of verification, but I am getting high errors in amplitude when the length of the waveguide is not a multiple of the wavelength of the...
View Articlerf mems switch design (comsol 4.2a)
HeLLO, i'm working on designing a switch that should work on rf range. I'm able to draw 2d structure in work plane but still not able to fix one side of the cantilver beam. i hve following questions,...
View Articleimpose a local young's modulus on many subdomains
hi everybody i want to make a script (matlab) to impose a local young's modulus on many subdomains (attached image of my subdomain) someone have any idea how to make it ? thank you very much
View ArticleStationary / time dependent solution differs
Hello everyone, my model is a U-shaped pipe in a concrete block. Cold water (1°C) flows through the pipe and the warmer concrete (11°C) surrounding it warms up the water inside the pipe. I used the...
View ArticleAC Joule Heating question
I'm currently on a trial license trying to evaluate this product for my company. I have here an assembly of 3 connectors. One end is given a terminal condition (with 2000 or 3000 amps), the other is...
View Articlemodel coupling
Dear comsol users, I am a new user of comsol and I am building a 3d model with two physics: laminar flow and thin film-shell. I am trying to set the outlet pressure of thin-film flow as the inlet...
View ArticleHeat equation in cylindrical coordinate
Hi Does any one know how I can use cylindrical coordinate in 2D (r &theta) in heat trasnfer module for the heat equation? Basically I want to monitor conduction in radial direction only. Thanks
View ArticleA simple question for COMSOL v3.5a
Hello, I am now trying to use the femlin() in COMSOL v3.5a. According to the documentation, [Ke,Le,null,ud] = femlin(fem); Ke and Le are the stiffness matrix and load vector. null is the matrix...
View ArticleModélisation des écoulements à travers un barrage en terre
SVP , est ce qu'il y a quelqu'un qui peut m'aider à modéliser les écoulements dans un barrage en terre homogène sous COMSOL multiphysics. Ci attaché le model Le niveau de l'eau se trouve à 13 m de...
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