Efficient time-periodic steady-state analysis using Optimization Module?
To compute phenomena like the eddy currents induced in the rotor of an electric machine at steady state (or an induction motor at steady-state), a full transient simulation is normally needed. Because...
View ArticleUsing both Cartesian and cylindrical coord. sys in a model
Hi, In my model, I define a few boundary conditions in Cartesian coordinate system. I was wondering whether the other variables that I define, for example for Domain, must be in Cartesian as well. In...
View ArticlePlot at time 0
Hi, I just found that the results of my simulation at t=0 are not exactly the ones that should be. I mean those results are for a time step that is really small after time=0. You agree that time=0 is...
View Articleport boundary condition vs. PML+port boundary condition
Hi all, I get different results when I use port boundary condition and PML together than when I only use port boundary conditions for input and output. I've calculated transmittance and reflectance and...
View ArticleComsol 4.3a Memory problem -- not using enough RAM
Hello everyone, Usually the complain is that Comsol is using too much memory, but in my case its other way round. I have a really nice machine in the lab with windows 8 server. I have Comsol version...
View ArticleContact problem. Static vs Dynamic
I have an impact model; steel presses down soft tissue. I can solve this model in static analysis with prescribed displacement. But when I solved the model in dynamic analysis with prescribed velocity,...
View ArticleTwo solids in contact with relative movement
Hi I was wondering if there are any comments on the problem that I am working on it at the moment. Basically, consider two solid cylinders (like piston and cylinder) that the first one is moving inside...
View ArticleCantilever Strain at Resonance Frequencies
Hello, I am new to Comsol and am trying to simulate strain in various structures at their eigenfrequencies. I have no problem finding the eigenfrequencies, but the amplitude in the eigenfrequency study...
View ArticleCOMSOL closed during computation
Hi, My model includes an electrostatic module and three convection and diffusion modules. The model did work well for some times, but recently the COMSOL keep closing during computing with the same...
View ArticleParticle energy distribution
Hey Comsol gurus, I am trying to simulate complex particle distributions in electric and magnetic fields. The mf and es parts are working quite nicely but I am experiencing some difficulties setting up...
View ArticleParticle Tracing Plot
Dear Comsol Community, I am simulating particle tracks in a mass spectrometer. I would like to know the particle positions after they exit the magnet, i.e. when they hit a screen. I would like to make...
View ArticleLinear Boundry Load
hi, My model is a simple square geomechanical model. I am going to apply a linear boundary load along the right side of square but there is no option for doing this. Could you please help me with this....
View ArticleB-H curve for Soft Iron
Hello there ! I am about to use (soft iron) as a core for a saturable device . I need to specify the H( knee) & B(sat) points, but the listed values of B & H in the BH curve seem to away...
View ArticleNegative effective strain (solid.epe)
Hello! I'm doing a thermo-mechanical transient process, however, when I evaluate the effective plastic strain versus time at certain points, I get negative values for effective plastic strain (ts.epe...
View ArticleFlux through arc of circle
I have to compute a magnetic flux though an arc. I tried to specify a parametrized curve 2D to evaluate the integration but I do not know how to specify the minimum and the maximum value of the...
View Articleswept mesh
I am trying to simulate T-junction conduction-convection fluid flow. I am using swept mesh with rectangular mesh. When I start solver the solution progress becomes very slow and the computer seems to...
View ArticleLooking for someone with Comsol experience
Dear all I need some Comsol models to do in the next month. I don't have much time and experience to finish all so I am looking for some help. The simulation must be in the Ac DC module to model the...
View ArticleComsol 3D Simulations Memory Requirements
I am simulating inductor coil with shielding and square surrounding the arrangment. While solving the problem in 3D I am getting this error, for this much of DOF how much ram I would need to compute...
View ArticleMagnetic Fields: 2D Axisymmetric Model of Toroid Inductor
Hey guys, I want to determine the inductance of a toroid core + winding as shown in .jpg I specify an external current density, such that the current flows around the core (in r and z direction). Under...
View Articlecomsol not using the entire memory
I have 32GB of ram on my computer with an 8 core cpu, but the transient solver im using does not go beyond 7gb and my processors running between 40 to 60%. I looked upon a few threads on the forum but...
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