How to implement a biphasic asymmetric waveform?
Hello everyone. I'm trying to figure out how to implement a biphasic asymmetric waveform in Comsol 4.3a. I need to be able to use the following electrical simulator settings in order to stimulate an...
View ArticleAdding a Faxen Force on Stokes drag force in Particle Tracing Module
Hi everyone, I am trying to use the particle tracing module with a non-uniform laminar flow in a channel. I am using "Drag Force" to trace the particles' motion. However, the Stokes force is defined...
View ArticleMeshing Error
Hello everyone, i want to attach the electrodes to the boundary of my model , but when i am try to mesh or add the sub domains, it shows me error"Could not resolve subdomain relations" could you please...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
View ArticleAveraged flux
Hi, how to average the time-dependent diffusive flux for pre-defined time intervals at a domain boundary and allocate those (averaged) values to the arithmetic mean of the time intervals? The...
View ArticleInduced current in a power cable sheath
Dear all, I'm probably missing something obvious, but I am having trouble creating a good model of a single-phase power cable. Herein I want to calculate the induced current in a (copper) cable sheath...
View ArticleEditing Weak Form within RF Module in 4.3a
Hi all, In 3.5a, within the RF module you can edit the weak form yourself by going to Equation System -> (Subdomain or Boundary or Point) Settings (see screenshot). Is this functionality still...
View ArticleDifference b/w von Mises stress and von Mises stress Gauss point evaluation
Hi, Does any one know what is the difference between simple von Mises stresses and von Mises stresses Gauss point evaluation. Also what is the difference b/w the effective plastic strain and simply...
View ArticleCOMSOL 4.3 with MATLAB error
I have a problem with COMSOL 4.3 with matlab simulation. The error message is below. ??? Java exception occurred: Exception: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException...
View ArticlePhase Field Method - define parameters
Hi everyone, I'm using the phase field model in Comsol, but I'm not really sure how to define the required parameters, such as: surface tension coefficient, interface thickness, mobility tuning...
View Articleconvergence issues in cojugate heat transfer problem
Hi, I am trying to solve a conjugate fluid flow and heat transfer problem. The problem has a channel with fluid flowing through it and surrounding media which has some heat sources. I am having issues...
View ArticleHow to export data in excel format?
Hey Ivar, I want to export my figure into excel format. and replot it in matlab. Is it possible ? Thank you very much!! Baofeng
View ArticleConjugate heat transfer Interface boundary condition
Hello All, I am new to COMSOL. I am trying to solve a 3-D conjugate heat transfer problem with volumetric heat generation in the solid domain. The problem is more like solving for a temperature profile...
View Articlepoint graph export problem
Hi No problem exporting line graphs. When exporting point graph I get a message: error unknown property: spacevars?! thanks DAvid
View ArticlePCF, PML
Hi, I am designing a PCF with hexagonal pattern having five air hole rings. pitch = 1 um. air filling fraction = 0.90 i have used circular PML to get the imaginary part of refractive index. what should...
View ArticleAxial flux permanent magnet generator
Hi Dr. Ivar/All, Iam trying to simulate the axial flux permanent magnet generator with two rotor and a coreless stator sandwiched between two rotor. Permanent Magnets are attached on inner surface of...
View ArticleCOMSOL 4.3 with MATLAB error 2
I have the code that have for loop. Before the first loop is finished, we met several error messages ??? Error using ==> mphinterp at 317 mphinterp (292): Java exception occurred: Exception:...
View ArticleQuestion about eddy current model
Dear friends, what if I want to know the temperature distribution in the plate in the eddy currents tutorial (www.comsol.com/showroom/gallery/970/)? The only result I get in this model is the resistive...
View ArticleDifference between "Electron outlet" and "Insulation" in the drift diffusion...
Hi all I have a fairly easy question about "drift-diffusion" physics in Plasma module. There are two types of settings for boundaries: "Electron outlet" and "Insulation". In the "Equation" for both of...
View ArticlePlotting the gap distance variable
I am trying to do something very simple, but it doesn't seem to be intuitive. I have a contact pair in the structural mechanics module and I want to plot the gap distance variable as a function of...
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