got problem with my simulation on nano scale particles
I would like to simulate the magnetic force on an iron particle due to an external magnetic field. The magnetic field is generated by a wire, conducted with steady current. The wire is about 30um in...
View ArticlePlotting unwrapped phase
I am plotting the phase response of a loudspeaker, and I want to unwrap it (like what the Matlab command unwrap() does)www.mathworks.com/help/techdoc/ref/unwrap.html Any ideas?
View ArticleThermoelectric Effect - Adding the physics
Hello, I'm working in a project on thermoelectric generator. As 'Thermoelectric' physics interface,is not in the physics area/physics list, I was trying to add the physics using the steps given in the...
View Articlecluster computing mpi
Hello, I am trying to run my models from comsol on our University's super computer, and having difficulty with the $PBS_NODEFILE command. Can the PBS_NODEFILE also be used to run generic MPI programs?...
View ArticleFlouquet periodicity on Eigenfrequency analysis 3D
Hi everyone! I'm trying to obtain dispersion curves for a 2D periodic structure in 3D. Already build the geometry (basically a ball inside a box), assigned the materials, and set the Flouquet...
View ArticleHow can I find eigenmodes propagating in given direction?
Hi! I have a general question about eigenmode problem in RF module. How can i find only eigenmodes propagating in given direction? For example, let's consider an infinite number of parallel cylinders...
View ArticleDependent variable definition
Dear all, I am having trouble finding which variables the solver is solving for. I know that I can see all the variables if I activate the equation view. However, out of all these I am not sure which...
View Articleimpact
how can i solve a structural mechanics problem where there is a contact between to structures with certain velocity?
View Articleabout parametric sweep and optimization
I built a reaction model, I want to know the equilibrium states of the reaction at difference concentration of one material. so I use the parametric sweep to calculate the equilibrium results. but when...
View Articlematlab function unwrap giving odd results?
Dear all, I am trying to unwrap a phase plot, using the unwrap Matlab function. This function works fine in Matlab on the same data but gives erroneous results in Comsol. I added the function in the...
View ArticleRecalculating solution only for point probe
Hi, I am using comsol to model heat transfer in solids, but I am mostly intrested in the solution at certain points. I know that I can use domain point probes for this purpose, but I was wondering...
View ArticleCross Sectional Integration
Dear Fellows, I've got this problem since long time, and despite searching everywhere, I couldn't find the answer. The problem is a heat transfer with fluid flow coupled. I need to integrate over the...
View ArticleData set solution variables
Dear sir, I am following the 'cylinder_flow' model from the model library to illustrate integration of data sets. However, I am not sure which variables are being integrated. Therefore I have these...
View ArticleDense solver
Hi, Has anyone used the "Dense" solver? It is a new option for a Direct solver. The old option was between MUMPS, PARDISO, and SPOOLES. I couldn't find anything in the Documentation or on the website...
View ArticleField cage simulation
Hi, I am simulating a 300 V/cm electric field generated by a field cage composed of square copper plate (see enclosed figure). The mother volume is just a box of air, but in reality a gas will be used....
View ArticleInfinite elements problem in AC/DC modul
Hi all, I have problem concerning of "Infinite Elements" in AC/DC modul. I know there are couple of discussion about this but this is still unclear to me. I have read the manual and I followed the...
View ArticleSplit a surface
Hello, Anyone knows how I can split a surface or a solid to some sub-elements? I made a pipe in 3D and know I want to slice outer layer of the pipe into some clickable elements. I made a work plane as...
View Article4.3a demo: Battery capacity fade. There is an unwarranted parameter.
An interesting thing is discovered that the newly added demo "capacity fade.mph" in 4.3a was deleted in 4.3b for unkonwn reason. The capacity fade model was established by referreing to these two...
View ArticleHow to make a dependent variable does not take negative values?
Hello, I am modeling microorganiamo growth in a bioreactor, using the Chemical Engineering Module. The question is, as time passes, the organism grows and feeds on a substrate, the substrate...
View ArticleMaximum value at each point
Hi there, I'm fairly new to Comsol so please excuse me if the question is trivial: I have modelled the temperature profile in 3D for a slab that is heated intermittently from either side. What I now...
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