Trying 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 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...
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 ArticleCoordinate system and COMSOL solver
Hi This may sound silly but I need to understand the basics. I am bit confused about how COMSOL handles coordinates. I have a circular geometry in 3D, preferably in theory it is usual to use a...
View ArticleMirroring results across a symmetric plane
Hi guys, Just a simple question: How can I mirror the results through a symmetry plane in comsol's post processing? I want to view the results in full domain instead of half of it. Thanks. SMHH
View ArticleRunning a specific Study node using batch
Hi, I would like to run a specific Study node (suppose I have a model with 2 or more Study nodes) using batch commands. Normally I write something like comsol -nn 8 -np 8 batch -inputfile input.mph...
View ArticleHow to include anisotropy in the solid mechanics module
I am working on a model, simulating an anisotropic material that shrinks and warps due to changes in temperature. I wonder how can I include an initial temperature (thermal strain) in the structural...
View ArticleHow to use parameters between different physics?
Hello, my name is Wang Jiujiang from University of Macau. I am using COMSOL to simulate a capacitor, after I simulated using DC voltage, I want to add AC voltage. After I add a physics--circuit and...
View ArticleHow to use simultaneously straight wave and oblique wave radiation in COMSOL...
Hi everyone! I am using COMSOL to simulate the acoustic lens system. I am experiencing problems in the use of simultaneous straight waves and oblique waves radiation on the same plane in Acoustics...
View ArticleCan not open model made in versions before COMSOL 3.5a in 4.3
How can I open a COMSOL model made in versions prior to 3.5a in COMSOL 4.3? Would someone be able to convert it for me some how? Thanks
View ArticleMicroring resontor Transmission spectrum simulation
Would anybody like to correct my model? i cannot get the right transmission spectrum. Thank you.
View ArticleHow to calculate the otpical waveguide transmission spectrum
How to calculate the otpical waveguide transmission spectrum? I use abs(S21)^2 to evaluate it, but it seems unphysical. Anybody give help? thanks.
View ArticleHeat transfer in a press
Hello, We want to see the heat transfer in a piece of steel. The press is made of a cold and a hot side, with between the two matrix a piece of mica to isolate those two matrix. First we have to...
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