failed to evaluate variable jacobian
Hi everybody, i want to do the exapmle of carbon deposition in heterojeneous catalysis at the end when i excute compute i get the following message: failed to avaluate variable jacobian: variable: re....
View Articlemerging a 2D MATLAB plot with a 2D COMSOL plot
Hello, I have a 2D plot in MATLAB and a 2D plot in COMSOL 4.3b. For comparison purpose, I would like to merge the two figures into one. I don't know whether it is possible or not. If it is possible,...
View Articlesimulated stress contour exporting
hi, i performed a 3D simulation for a stress distribution, with stress contour lines labeled. now i would like to export the stress values and replot it using other ploting tools like Origin or Excel....
View Articlechange the thickness of the contour lines
hi, i performed a 3D simulation for a stress distribution, with stress contour lines labeled. the thickness of the contour line is a bit too thin to see. how can i change the setting of the contour...
View Articlewhere is the icon to add heat transfer with Phase change
I was going through one tutorial on heat transfer through phase change. In the menu under heat transfer in fluids i could not find heat transfer with phase change? Is it related to the version.
View Articlescales for dependent variables in laminar flow module
Hi guys, Scales for dependent variables: mod1.u: 1 mod1.p: 2.3e+002 mod1.spf.Pinlinl1: 8e+007 When I apply inlet condition with normal inflow velocity, there are only mod1.u and mod1.p, so no problem....
View ArticleCall a MATLAB (R2008b) function from COMSOL 4.2a
Hello, I would like to call a MATLAB function under COMSOL 4.2a. When I plot this function, I have the message error "Failure loading MATLAB libraries. This model requires that MATLAB is available". I...
View Articlesaw RFID
I am working on SAW RFID tag and i cant able to get the plot of reflection coefficient vs frequency and also that of time response . Anyone please help me
View ArticleComsol does not finish the calculation even though convergence criteria is...
Hi, I have a rather strange problem with COMOL and hope that anyone can help me. I am trying to solve a "free and porous media flow" on a 3d geometry. The calculation is not converging very well but it...
View ArticlePML only available to Frequency response analysis?
According to the following paper, PML was available only for frequncy response analysis and not implemented in eigenfrequency analysis in COMSOL 3.3. But is this still the case for 4.3a...
View ArticleAcoustic S Parameters Calculation
I am having some difficulty in calculating the acoustic S parameters in COMSOL 4.2a. 1) What parameter should be measured to calculate the S Parameters? Should it be the acoustic pressure [Pascals] or...
View ArticleAcoustic S Parameters Calculation
Hi, I have a very beginner-level doubt regarding the understanding of S Parameters- If we are to take the scattered sound pressure values, they have a real and imaginary part, i.e they are in the form...
View ArticleHow to modify element type in comsol 4.0?
I used weak-from PDE a lot for custom physics simulation purpose. In comsol 3.5a, you can set the element shape function type and its order or even specify discontinuous element type in 'Element' tab...
View Articlesingularity. error
Hello, Does anyboday know why I encounter the below error message in Comsol 3.5a? Error: Time 7.86913096623935e-007: Repeated error test failures. May have reached a Last time step is not converged....
View Articlesimulation of solidification or crystallization using Phase-field method?
I didn't find examples in the model libraries that can be referd to. Does anyone can recommend some references to me to read about how to simulate solidification using the phase-field method in COMSOL?...
View ArticleRF module and Electric Circuit
I was wondering if anyone has had any luck using the RF module along with the electric circuit module? Trying to model a dipole with a diode between leg, with an induced voltage across the terminals....
View Articleanode and cathode
Hello everybody! I'm creating a plasma with a Inductively coupled plasma and laminar flow interface. I want to put the electrodes (anode and cathode) in the model (within the device) and apply voltage...
View Article3D optical waveguide error
Hello everyone, What I'm trying to do is basically simulate an optical fiber in 3D. I thought it would be a simple task but I'm running into an error. I created an optical fibre with an air cladding....
View ArticleIntegrate one Study in another
I am trying to solve a study with a fluid flow problem and an electrochemistry problem. Both studies can be solved by themselves but if I want to solve them together or use the Velocity field of the...
View ArticleError in the demo model ?
There is a demo example "Thermoelectric_leg.mph" available in the Multiphysics installation and it locates in directory c:\program files\COMSOL\COMSOL43b\demo\builder\thermoelectric_leg.mph". It uses...
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