Frequency domain study - changing the force on a point load with frequency
Hi, I'm having some trouble finding out how to apply a frequency-dependant force. I have a model where up until now, I've been using a non-varying force of 1N on a point load, then performing the...
View ArticleCoupling of Drift Diffusion and Heavy Species Transport Plasma
Hello, I would like to simulate a cold plasma (Tritium ions/Electrons) in a tube in a high magnetic field. On one side of the tube there is a potential (some Volts) and on the side walls of the tube...
View ArticleMeshing problem
Hi everyone! I am using Comsol 3.5a and cannot figure it out, how to mesh this attached model ... I tried everthing from free mesh predefined mesh sizes (all of them) to boundary layer mesh but I'm...
View Articleplasma module: rate coefficient
Hi plasma model DC Discharge have 5 example three of them :1- argon- dbd-1d 2-dpd-flow -control 3-plasma- display- panel in these example there is a value in Modeling Instructions (Locate the Kinetics...
View ArticleExtracting time-dependent data from 2D axisymmetric plot
Hi all, I created a 2D axisymmetric conjugate heat transfer model in 4.3a, and it's time dependent. It's a sphere being heated by moving fluid around its geometry. The output has the temperature...
View ArticlePlane Wave Radiation in Transient Analysis
Hello Dear Friends, I want to simulate a simple model via transient analysis. My model is similar to "porous_absorber.mph" (4.3b). My model is more simple. Fundamental difference between two models is...
View Articleend equation
under Variable I define: h = if(T<483[K],-H3*d3*rho*0.25,0) H3, d3 and rho are constants. how can I end the equation h when T is 483[K]? that's mean if T= 483[K], end h , because if the temperature...
View ArticleAdding the Kanda factor for Piezoresistive pressure sensors
Hello, I am working on a pressure sensor simulation. How to define non-linearity of materials? I noticed that checking the box of non linear geometry in the study step gives sort of non linearity on...
View Articlesand ripples simulation
Hi folks, I am trying to simulate the formation and motion of sand ripples ( sand particles driven with wind). I think that this process may be considered as a two phase flow or a flow of a mixture of...
View ArticleWhy does my S11 parameter change when adding a 2nd inactive port?
When looking at off-normal reflection from a periodic structure, my S11 results change when I add a second, unexcited periodic port (S2x). My first periodic port is sending a TM mode in Hy, with...
View ArticleUpper and Lower Constraints or limits on variables
I have a model I am trying to run involving the concentration of hydrogen in zirconium and it keeps dropping below 0 in some spots and above 1 in others... It solves several PDE's one of which is the...
View ArticleSkin-depth meshing in a two phase fluid model of a cold crucible melting process
Dear Collegues, I'm actually working on a model of a semi-levitating cold crucible melting process. I want to predict the deformation of a metalic mass due to the interaction of EM, hydrodynamic and...
View Articlemodeling a rotating electrical machine
Dear Comsol Users, I am trying to model a simple rotating machine in Comsol 4.0a. I am attaching the model file. Unfortunately, I couldn’t find any documentation or examples how to start up a model...
View ArticleDifferentiation of electric potential
I have used Laplace equation module to compute electric potential for certain geometry. Now I would like to compute electric field lines, but I am not finding a way to do that. Please help regarding...
View Articleerror in Frequency-Transient Simulation
Happy new year! everyone recently i have maked a Frequency-Transient Simulation and got a error infomation:"Failed to find consistent initial values. Last time step is not converged." the detail in...
View ArticleIntegrate on the cross section to find Moment and Torque
Does Comsol have specialised built in functions to find Moment and Torque by integrating over the cross section of a surface modeled by 3-D elements? Say I model 3-D CAntilever beam in Comsol using 3-D...
View Articlehoe do draw a soild cylinder in terms of slices -comsol4.3 version
Hai, I like to know how do draw a solid cylinder in to no of slices in linear direction.please let me know this ,hereby I attached the image of cylinder which one need exactly. regards, N.Kumar
View ArticleContinuation Study
Hi, How I'm gonna do if I want to simulate a study which uses previous result to continue. For example, I completed 1st study and get the result, then I want to continue the 2nd study (settings on...
View ArticleRay trajectory with abrupt refractive index distribution
Hi, I am simulating the trajectory of light ray passing through a homogenous material. For example, the light trajectory passes through a magnifying glass. There is a good 3D example in “Model library”...
View ArticleElectroanalysis - impedance
Dear all I have tried to browse through documentation and exemplary models to find out what "Electroanalytical Butler-Volmer" kinetics means in terms of concentration polarization. There is no...
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