About 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 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...
View ArticleLoading a beam
In structural mechanics module, with Edge load I can Loading a beam with a rectangular load pattern, but I don´t I realize how i´ll loading with another load form like a triangle or another function......
View ArticleTrying to write positive values
I'm working on subsurface vapor intrusion modeling. In solute transport module I need to define a coefficient for vapor sorption which is also a nonlinear function of concentration. The function...
View ArticleHelp with calculation of drag coefficent
Hi! I´m having trouble with the obtention of the drag coefficent for a cylinder immersed in a flow. I´ve been able to read the tutorial of this...
View ArticleInternal and external natural convection seperation
Hello COMSOL Community, Firstly I would like to say thanks to everyone who so regularly contributes to these forums and breathes life into them; namely Ivar. I have been setting up a relatively complex...
View ArticleWhich Physics should i choose????
Hello Friends, Am trying to observe the increase in diameter of a hole for an applied electric field. Since am absolutely new to comsol Multiphysics i find it difficult to choose the type of physics to...
View ArticleMiroring Resonator Simuation for cell trapping
Hi everone, Currently I have a model for force calculation of optical waveguide trap cell, but I meet a problem when I simulate use a microrign resonator. The problem is I can not get a resonance in...
View ArticleMode Solver Error "Feature 'weqs1' does not support model input"
Hi all, I'm fairly new to comsol and I can't find a way around this error in the model I'm building. I'm looking for modes in layer 8 of my structure. I've attached the file. Thanks in advance for any...
View ArticleLiveLink for Excel
Hello; it seems that livelink for for excel is free for new users (1st octobre...) whitch i saw in the web site. Can you explain more how to install livelink for excel? is it, right, free now?
View ArticleMaxwell stress tensor integration
Hi everyone! I'm still trying to compare the electrostatic force calculated by the expression (F=0.5*epsilon*V^2*A/g^2) with the result coming by Maxwell stress tensor in COMSOL. I used the suggestion...
View ArticleNonlinear electric conductivity
Hi, I'm currently working on electrical transients simulation using AC/DC module. How can I define nonlinear electric conductivity of zinc oxide (ZnO) in subdomain settings? Thank you
View ArticleTransmission spectrum for optical waveguide
Hello, I am currently trying to extract a transmission spectrum from a Si waveguide on top of SiO2 substrate. There are some gold particles on top of the Si (this configuration is taken from an article...
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