Comsol, Matlab and xmesh-error
Hey, I trie to run my Comsol simulation via Matlab because I want to loop some parameters. For test-reasons I try to run the tomograph tutorial as it solves quick. I'm using Comsol 3.5 but when...
View ArticleComsol issue on Linux
We had a simulation computing for about 3 weeks and paused it to quickly analyse some results. We created a graph and then Comsol stopped responding. It uses 100% of one of the CPU on our Linux...
View ArticleVariables
Hi everyone, I have a simple question for you. If I have a variable 'D' , coeficient difusion, depends to temperature (T) with the expression D(T)=0.29*T. the range of temperature is (900 kelvin to...
View Articleparameters
Hi everyone, I have a simple question for you. If I have a variable 'D' , coeficient difusion, depends to temperature (T) with the expression D(T)=0.29*T. the range of temperature is (900 kelvin to...
View ArticleMie scattering in 4.3
Hello, I have already seen some discussion about mid scattering of a gold nanosphere. But I the discussions I have consulted, no one has yet implemented a mie scattering program in Comsol 4.2 or 4.3...
View Articleoptical Waveguide
Hi I am defining 2D waveguide from Er:Ta2o5 waveguide in top and bottom of sio2 substrate, now i want to define electromagnetic wave to this.and then i want to calculate the gain. 1-how can i excite...
View ArticleReacting flow, diluted species
Dear all, I am currently simulating the reaction of a dilute compound which flows through a cylindrical tube under laminar flow conditions. I am trying to use the physics method "Reacting flow, diluted...
View ArticleWhat type of boundary conditions to use for a part of electric chain
Hello, I'm not really good with DC, but I have to solve one problem connected to it very closly. I have a model of a bimetallic Copper-Aluminium conductor. I know, that the value of generated current...
View ArticleElectron Cloud Confinement
Hi, I am trying to model the confinement of a cloud of electrons in the center of a spherical axisymetric system. The electrons are confined by an electric potential. I was wondering if anyone had...
View ArticleEvaluating average value of variable along the length
I am solving free and porous media physics in the square domain (3D). I want to calculate average flow velocity through one of the four sides of the wall along the length. In 2D, I know that we can use...
View ArticleAbout optical force calculation of particles manipulated by microring resonator
Hi,everyone. I want to simulate a structure which includes two bus waveguides and one microring resonator to form an on-chip optical tweezer. One microparticle is placed in the gap area between one...
View ArticleHelp...Which Iterative solver settings for 3D RF module with periodic...
Hi All, Can somebody help me with my solver settings confusion. I'm trying to setup a 3D RF module simulation with around 250.000 elements only with periodic boundary condition. I read that I should...
View ArticleNegative port impedance
Hi All, I am currently doing some antenna modeling. The antenna is excited by a 50 Ohm coaxial port. I get reasonable S11 results at resonance but the lumped port impedance is negative e.g. -5 Ohms....
View ArticleERROR: nonlinear solver did not converge, when simulating ball movement in...
Hi all, I have seen several threads about this error and tried to figure it out myself using the sample cases but I still fail to simulate this. Any help will be greatly appreciated. I am trying to...
View ArticleURGENT!!ERROR
Hi!during the simulation an error appears: Failed to find a solution: In segregated group 1: The relative error (0) is greater than the relative tolerance. Returned solution has not converged. What...
View ArticleReflectance / Transmittance calculation using PORT
Hello all I want to calculate effect of nanostructure on reflectance and transmittance. As a starting point, I have refered "Fresnel equation" library. Without any nanostructure, the calculated...
View ArticlePredefined rigid body movement in a laminar flow
Hi, I want to model a predefined rigid body (cross-section of a bridge deck) movement in a laminar fluid flow. The deck should be moved in a harmonic oscillation (heaving or pitching) at a specific...
View ArticleNolinear solver did not converge. Out of memory during LU factorization
Hello, I am building a model using version 4.1, in which heat transfer driven melting of paraffin. Each time I compute, is solves at first and then the following error appears: Nonlinear solver did not...
View ArticleModeling elastic waves in a solid mechanics study
Hi, I'd like to ask a question concerning the modeling of elastic waves in the structural mechanics module. The geometry is a simple 3D beam, free on all sides. (file attached) My goal is to study the...
View Articlespecifying varing coefficient - interpolation function
Hi all, I would like to specify varing htc via interpolation function and apply it to a heat flux boundary condition. I am attaching a sample file. - Model: 2D-axisymetric (i.e.cylinder, mm), heat...
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