Exporting 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.
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...
View ArticleWear Model - Solving a contact problem with irregular geometry
Dear COMSOL, I wonder if you could help me in solving this contact model in COMSOL 4.3. I am implementing wear by solving a quasistatic contact model using the Structural Mechanics module, extracting...
View ArticleModelling Cavitation Bubble Radius Oscillation using Equation Based Modelling
Hello, I am trying to model the radius, R(t), oscillation of a cavitation bubble in liquid (compressible) subjected to alternating pressure at ultrasonic frequency. I would like to model the radius...
View ArticleWaveguide Dispersion Curve
The MATLAB coding for solving second order differential equation(D(λ)=- (λ /c)*(d^2n/d λ^2)) of wave guide dispersion is heavily needed. I have values of effective index n, c is constant and variable...
View ArticleMatrix has zero on diagonal
Hi experts, I mat a problem when simulate a AC/DC model. it came out as below: Failed to find a solution for the initial parameter. Segregated group1 Matrix has zero on diagonal. Returned solution is...
View ArticleCFD - Surface roughness
Hey guys I really need your help on this one! I was wondering if any of you could tell me about the default settings of surface roughness's in COMSOL? All I've found about it in the documentation is...
View Articleadding wavelength to waveguide
Hi please help me,i am new in comsol I want to add wavelength to waveguide. i know the wavelength that i use. but i dont know in which field i enter the wavelength. Thanks
View Articlescattering nanoparticle cross section
Hello Sorry my English is not perfect. I have to make a simulation of a gold nanoparticle (R = 20nm) hit by a plane wave. I have to get a chart: x-axis - wavelength (200nm-800nm) or frequency y-axis...
View ArticleCauchy Stress
hi I´m modeling a plate. In the results branch I configurated a 2D plot to show "the Second Piola-Kirchhoff stress, xx component" using the expresion "plate.Sxx". I want to know if it's possible to...
View Articlemodeling of bone
Hello! I wanted to know if it is compulsory to use an equation based model if we are 2 study some stress and force properties on a 3-d model say bone.Given appropriate parameters and material details...
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