Loading 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 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 ArticleProperty: dl error
Hi All, I have a 3D simulation and am trying to plot a streamline, however I keep on getting an the following COMSOL error Property not given - Property: dl Does any one know what this "dl" property is...
View ArticleSound Absorption Coefficient of Materials
Does anyone know how to simulate the "Sound Absorption Coefficient" of materials? I tried to build a waveguide (impedance tube) on top of the materials, but it doesn't work for high frequency.
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 ArticleExporting data for multiple Cut planes
Hi all, I'm modeling a mixer and I would like to export concentration profiles at different cut-planes along the channel. I can do a single cut plane export with: Defining: Data Sets -> Cut Plane -...
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.
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