applying a periodic biphasic square waveform to a surface electrode
Dear friends, I want to apply an AC voltage/Current to a surface electrode placed on the human skin. I need a periodic waveform with unequal on and off time. How can I apply this stimulation pulse to a...
View ArticleMatlab assign geometry to materials
I desperatly try to run matlab script to simulate a 2d axissymmetric simulation. The geometry objects and the materials were easily created. The problem is, that I struggle to assign the geometry to...
View ArticleMoving Mesh - Thermal stress coupling
Hello to all, I need to perform an RF frequency domain analysis on a waveguide which has been previously deformed by a Thermal Stress stationary analysis. In order to do this, I need to calculate the...
View ArticleSplitting one Geometry in two
Hello, Iam a newy in working with comsol Multiphysics and would be very glad if I could find some help in this forum for my problem. I would like to define two different materials in one geometry. You...
View ArticleParticle Tracing time plot
Hello, I am attempting to create a 2D map of drift times from release until contact with some defined surface. Is this possible to do in COMSOL? If so, how?
View ArticleBatch Processing sj
Dear Engineers/Scientists I am trying to simulate time dependent study a diaphragm with piezo actuator fixed from its periphery and want plot Voltage Vs deflection and also frequency Vs deflection...
View ArticleIonization of air.
Hello. I have a model that comprises a container filled with air. From the outside there are two coils number of turns 1e6 supply current is 1e3 A in the container are two electrodes voltage + - + e7 V...
View ArticleBase vector coordinate system
I am modeling the anisotropic behavior of a plate that have fibers oriented in different directions. For this purpose, I am using the structural mechanics feature. I am orienting my fibers using a...
View Articleparameter sweep error when loading a geometry
I am applying a load to the top of the geometry shown while the bottom is fixed but i keep getting an empty parameter sweep error can u help me??
View ArticleFluid structure interaction and damping ratio
Hello, My model is a vascular cantilever beam (the first mode is pictured below). I work simultaneously on COMSOL and on my experiments. The channel is to be filled with a silicone fluid which will...
View ArticleMathematical particle tracing: Diffuse scattering wall condition
In Comsol 4.3a the diffuse scattering boundary condition is incorrect. it generates an angular distribution with respect to the surface normal of cos(theta), while the correct distribution is...
View ArticleCylinder section modelling
Hello all I wish to model structural mechanics in a section of a cylinder-like geometry consisting of longitudinal bars and radial rigid hoops supporting the bars. The full cylinder is too memory...
View ArticleError linking Heat Transfer in Fluids and Turbulent Flow (Spalart-Allmaras)
I am using COMSOL Class Kit 4.1 to model a pretty simple flow of hot air in a vertical pipe. I was able to get the model to working using Laminar flow (all are steady state studies) and the Heat...
View ArticleCOMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View ArticlePhotonic crystal fiber
I am trying to model a photonic crystal fiber with liquid crystal filled holes.. I am a starter and it would be really helpful if any one can help me regarding the resources from where i can learn the...
View ArticleThermal expansion model
I am trying to examine the stress distribution in a SiO2 film coated on a thick Si sample with a small Al bump on it, all heated to 700 K. I thought I built the model correctly, but the resulting...
View ArticleFinite Elements for Fluids P1+P1 P2+P1
Dear Comsol users, Comsol sets P1+P1 elements as default for laminar flow described by Navier-Stokes equations. As far as I know, theoretically, these elements are not good for such equations. Instead,...
View ArticleVoltage Induced in a Coil by Moving Magnet
Hi, I am trying to learn how to use moving mesh. And I created a project same as "Voltage Induced in a Coil by Moving Magnet", which can be found in Comsol website. But the problem is: when I run it,...
View ArticleUsing a Gaussian Pulse
Hi everyone, I'm actuallay working on a modeling of a laser pulse which is heating a front of a material in order to determinate the diffusivity, my current issue is that i would like to model my heat...
View ArticleStore data at certain time intervals
How do I set up my model so the data are not stored at every time step, but at certain intervals. That way I don't end up with huge file, and my plot files for exporting are small as well. Thanks in...
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