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 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 ArticleReacting flow, diluted species
Dear all, I am currently simulating the reaction of a dilute compound which flows through a cylindrical tube under laminar flow conditions. I am trying to use the physics method "Reacting flow, diluted...
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 ArticleView a 3D mesh
Hi, I am currently meshing a 3D structure (single domain) with boundary layers on all the walls. I would like to visualize the mesh in order to check and improve if necessary. I find it a bit difficult...
View ArticleImposing a mean gradient
Hi I want to impose the following boundary conditions in the domain C(0)-C(1) = 12 dC/dx(0)=dC/dx(1) Can someone suggest how I do this? Thanks
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 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 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 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 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...
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