What 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 Articledeformed parallel plate capacitor
Hi all, I'm working on a model of a parallel plate capacitor in 3D. I'm using the moving mesh, solid mechanichs and electrostatics physics as instructed in others examples. When a pressure is applied...
View ArticleSolving a size modified Electric Double Layer
Hi, COMSOL experts! I been trying to simulate an electric double layer that accounts for species size with Transport of diluted species and electrostatics module using the build in...
View ArticleImporting numeric port
In the RF module, is it possible to import a numeric port instead of automatically using the result of a Boundary Mode Analysis? I'm finding the normal way of doing it to be maddeningly limiting. Thanks.
View ArticlePeriodic boundary conditions in the PDE solver
I'm working on a simple solution for a closure problem related to developing the governing equations for mass transfer in a porous media. This requires a solution to Laplace's equation in a cubic unit...
View ArticleCoefficient Form PDE and periodic boundary conditions
Hi, I'm new to COMSOL so I would like some help regarding the following - I'm trying to perform a phononic crystal simulation using coefficient form pde. I have a hexagon with a circular hole shape...
View ArticleCoefficient form PDE, Zero Flux BC
Hi, Can I ask if there is any way in Coefficient Form PDE, to cancel zero flux BC and apply Periodic Boundary Condition? My file is attached. I really urgently need someone to help me out with this....
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 ArticleScattering from nanoparticles
Hi, I've simulated with COMSOL 4.3, the scattering of a multi wavelength light from different kind of nano particles, plotting the scattering, absorption and extinction cross section as function of...
View ArticlePersonalized heat source
Good morning everybody, I am a novice in use of COMSOL, I want to simulate the propagation of heat through a material, sounds easy but my heat source is a surface defined by a matrix (every pixel is a...
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 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 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...
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