How to calculate the confinement loss of the photonc crystal fiber
Hi, I am using the RF module to do some calculations of fiber. And I don't know how to calculate the confinement loss in fiber. I found that some people said the PML will be used to do this on this...
View ArticleExpression for Sherwood Number
Hi all, I'm looking to use the Sherwood Number for grid independence of a mass transport simulation, but am unsure what expression I should use in the plot. Has anyone ever written one before, or have...
View ArticleCan't see geometric block when transfer a model from Matlab to Comsol
Hi all, I am running Comsol ver. 4.3 build 4.3.0.151 and Matlab 64 bit ver. r2012a. I want to build a model in Matlab, to run it and then transfer the model from the Comsol server to Comsol client. I...
View ArticleSphere-Sphere Forces
Hello. Firstly, greetings to everyone, I am new here. So, I am trying to build a model based on this article:...
View ArticleEigenvalue analysis " Mass matrix is zero"
I am trying to run a Static Eigenvalue analysis of a structure . My model is a stone-building , so i just enter the properties of the material and the constraints . When i solve the problem appears the...
View ArticlePoroelastic waves - acoustic module - material definition
Hi, I would like to model a poroelastic material with the acoustic module. However, can you tell me how I can link my parameters to material proporties. My parameters are : - porosity - tortuosity -...
View ArticleNewbie needs help seting up ramp function as voltage source
I am new to comsol and cannot figure out how to assign a rect function as the input source to a strip of copper. I subsequently need to study the thermodynamics (which I have successfully done in...
View Articlecapacitance of a parallel plate capacitor
These are the steps for my capacitor simulation 1. set two solid blocks (dimensions (25x1x20) ) 1 distance away from each other. 2. set a solid box (65x43x60) to surround the plates of the capacitor....
View ArticleConductive Media DC(shell) + Electrostatics
hello I have been trying to couple the two application modes to find the electrostatic force on one boundary at a fixed voltage due to the voltage on a parallel boundary which has a variable voltage...
View Article3d laminar flow - solver problem: Segregated group 1.
Hi I´m simulating the convection heat transfer in a pipe. The external surface of the pipe receive solar radiation to heat the fluid that is flowing. I start my model with the laminar flow and after I...
View Articleimport a bmp image into COMSOL geometry
Hey, as stated in this webpage: http://www.comsol.com/products/formats/ Comsol can both read and write few types of images. However, when I tried to import a bmp image as my structure for flow...
View ArticleHow to use parametric sweep by loading parameter values?
Hi, I have several parameters to add in study settings, as below: parameter: a1 a2 a3 a4 a5 first set: 1 3 4 5 7 second set: 2 1 3 6 4 ...etc. There are many sets, so I don't want to key in step by...
View ArticleComsol not following ideal gas law or conservation of mass
Hello, I am currently working on modeling a high temperature hydrogen heat exchanger. I decided to start as simple as possible and just model the heat transfer into an axi-symmetric tube of hydrogen...
View ArticleGeometry optimization
Hello everyone, I´m modeling a simple heat transfer - structural problem, wher I have a 2-D rectangle with a hole in the midle. First I apply a Temperature load that produces expansion in the...
View ArticleTemperature Depdendent Electrical Conductivity acting weird.
Hi Everyone, I have two simple questions that I have been unable to answer after trying to work on them for a week. Please help me: 1) I have a very simple model (which I have attached), I am passing a...
View ArticleCluster computing got stuck :external progress scheduling
Hi,Ihave recently setup a cluster and i had comsol 4.3 on the head node,and i had the installation forder shared, model working directory shared. However,when I am trying to submit a batch job,using...
View Articlewhen to use parameters, variables, and functions
Hi All, Considering global values for now. It seems clear to me when to use parameters - any value that is independent of the independent or dependent variables. But when is it appropriate to use...
View ArticleThermoelectric Effect - Adding the physics
Hello, I'm working in a project on thermoelectric generator. As 'Thermoelectric' physics interface,is not in the physics area/physics list, I was trying to add the physics using the steps given in the...
View Articleparametric sweep
How to add parameters for the circle centre coordinates, and update parametric sweep settings , for change the distance between the two coils -- kishore Naik Mude
View Articledifference in simulated stress and strain
Hi, I simulated stress for a 2D Silicon structure using "thermal stress" in COMSOL, the simulated stress values are quite consistent with my experimental results. however, when I look at the simulation...
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