termination technique in eigenvalue solver
Hello, I would like to ask is there any way to stop the eigenvalue solver after some iterations, like it can be done with segregated solver? If there is no such way, is there another solver which...
View ArticleEMW Analysis Methodology
Can anyone offer any specific details on the the Robust, Intermediate, and Fast settings and how they relate to the Mesh and Solver? There isn't much coverage in the reference manuals and guides and...
View ArticleHeat Source in Turbulent High mach number flow !
Dear COMSOLERS ; I am trying to simulate an electric arc in a flowing gas through a nozzle. as you can see in the attached model, the arc heat is been added as a heat source in the hmnf interface. also...
View ArticleCurrent conservation issue when integrating charge density
I am working with an AC/DC, 3D, Stationary, Electric Currents model. I am currently studying charge density between deep brain stimulation electrodes of different surface areas and geometries. To...
View ArticlePhase change not working, warning inverted element
I am trying to simulate the heating and phase change of a low melting point metal. In the mph file that I've uploaded to Google drive (drive.google.com/file/d/0B3QaD21DDcpNeFdlYjJwNWE4Rzg), you can...
View ArticleAssembly Convergence Problem
I have a model in which I would like to model contact between two domains. The physics of the model (boundary conditions etc) works just fine if I don't include the contact. Using "form union" at the...
View ArticleTIME to FREQUENCY FFT
Dear all, I am simulating pulse echo technique using ultrasound. I have my results in time domain. Now I need frequency spectrum of my time dependent study result. In study 1 "time dependent " time...
View Articleinverted mesh element near coordinate
Hi dear all I want to see the mechanical changes due to flow of current through two parallel wires in COMSOL. To do this, first I used two "magnetic field" and "solid mechanic" modules. After getting...
View ArticleEnergy balance with variable density
Hello everyone, I am interested in finding the temperature in a system that changes the density in time and I would like to formulate the energy balance using this variable density. What I have in mind...
View ArticleHow do I compare the voltage difference of 2 boundaries with respect to the...
Hello COMSOL users, Im am trying to replicate the study attached that was performed at a COMSOL conference but i have ran into complications. (The file is attached below) I don't understand how to get...
View ArticleLinking to PSPICE Software
Hi, I am new to COMSOL and would like to model a piezoelectric energy harvester in structural mechanics module. Gradually, I would want to model the mechanical part in COMSOL and link it to PSPICE...
View ArticleCombine two solutions
Hey all, I have two consecutive time dependent studies and two solutions sol1 and sol2. In postprocessing I would now like to "stitch" these two solutions together, so that instead of having to deal...
View ArticleHow to sweep through different boundary conditions using parametric solver
Hi, I am investigating the current distribution in water, it requires me to send a voltage into a medium (water) through an electrode and measure through another electrode. My problem is how to change...
View ArticleDefining a variable limited only for the boundary
Can we define a dependent variable for a physics which is only valid for particular boundary and not for the whole domain?
View Articlemaxm no. of newton's iterations reached & parametric solver
Question about newton's iterations: I keep getting the following error Failed to find a solution. Maximum number of Newton iterations reached. Returned solution has not converged. I am unable to locate...
View ArticleCould you please tell me the name of the variable for time steps in comsol?
Hi I am working in comsol 4.2a version for hydrogen storage system modelling. Could you please tell me the name of the variable for time steps in comsol?
View Articlemax timestep
Hi guys, is it possible to connect (max) timestep of the solver with a variable x (which is changing with time)? if x gets big the next timestep should be smaller. max timestep on auto does work but...
View ArticleWarning: SOR line did not find any lines.
Hi everyone, I am running a laminar two-phase flow (level set) simulation with a 3D geometry. I had previously simulated the same geometry in 2D with the same initial values and boundary conditions and...
View ArticleCOMSOL Shut Down
When I am done making a model, I click on "Compute" in "Study 1" to start computing. But for some reason, before the computation is complete, the program automatically shuts down. I was told a separate...
View ArticleWeak form for 2-D elasticity
In an effort to learn COMSOL, I decided to model the two-dimensional elasticity equations using the weak form. I was surprised looking through the documentation that there are very few example...
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