Plasma electron impact reaction
In plasma simulation If i have the reaction Metastable –metastable associative ionization Hes+Hes=>He2++e with rate constant, k and threshold energy -18.2 where Hes is metastable Helium and He2+ ion...
View Articletransmission spectrum for beam focusing in plasmonics
Hi everyone Iam trying to simulate using the RF Module beam focusing through subwavelength slit using grating but unable to get transmission spectrum i hv defined two port one side it is small in width...
View ArticleCreating (and using) an involute coordinate system
I've defined an involute coordinate system using an interpolation function. For an unstructured grid of x and z coordinates, I have defined two new coordinates t_coord and h_coord which have vectors...
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...
View ArticleMagnetically Sprung Electromagnetic Generator
Hi guys, I have built a magnetically sprung electromagnetic generator for harvesting energy from machine vibration. Its basically three magnets in a tube, one fixed at either end and one floating in...
View ArticleUniform Magnetic field?
Hi everyone, I am wondering how I can generate a uniform magnetic field in Comsol. Basically, I want to simulate a metal particle moving in this uniform field. Now I am thinking put all the particles...
View Articlebuilding piezo ring projector (electroacoustic transducer)
Hello, I plan to build piezo ring projector, but I don't decide to build it as 2d axis symmetry or entire 3d model. My electrodes would be located circumferentially. 2d model would be problem because...
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 ArticleIssue importing ipt files from Inventor with the CAD module
Hi, I can't seem to import a simple IPT cad file (that has a helix built in) from inventor, the import module gives me an error back saying: Not a valid ENTITY type for this operation - Detail:...
View ArticleMicroweave frequency function with temperature
Hi I am studying an microwave problem in frequency domain, where the frequency of the waveguide problem needs to change during the simulation. I successufly, made one simulation by definying a...
View ArticleMeshing a surface with an interior point
I need to apply a point force on a point inside a shell surface. For this purpose I draw a point in geometry section. However, because of that point I can't mesh the surface with free quad or mapped....
View ArticleTaylor Hood or Crouzeix -Raviart element
Hello all I am using COMSOL for solving the velocity and concentration field. I am using quadratic elements. But I don't know what kind of quadratic elements COMSOL uses. Is it a Taylor Hood or...
View Articleapplying 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...
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