Can I pause the calculation and check the intermedia result?
Hi All, Can I pause the calculaiton of COMSOL and check the intermedia result? I would like to check if the intermedia result is reasonable or not. I don't want to only depend on the convergence plot....
View ArticleCan I pause the calculation and check the intermediate result?
Hi All, Can I pause the calculaiton of COMSOL and check the intermediate result? I would like to check if the intermediate result is reasonable or not. I don't want to only depend on the convergence...
View Articlemovement of a wire in an electric field
Dear Comsol-Community, I am very new to Comsol. My task is to simulate the movement of a wire particle in the electric field of a gas-insulated-transmission-line. the movement is caused by some forces...
View ArticleMathematical Particle Tracing
I have the following problem: - I solved a mathematical particle tracing problem on a 2D model and I gained access to the particle dynamics; - next, I need the values of the particle velocity...
View Articlewhy COMSOL is solving so slowly
Hi All, I am running a case with radiation heat transfer. The 3D geometry is quite simple. Number of degrees of freedom solved for: 56826 (plus 39748 internal DOFs), and element number is around 24K. I...
View Articleconvergence history
Hi All, I find that I can show the plot of convergence histroy after I re-open a convergenced case. How can I retrieve the convergence history? Thanks and regards.
View ArticleAcoustic Band Structure of Metamaterials
Hi folks, I have been trying to find the band structure of an acoustic metamaterial. I have been attempting to adapt the "Bandgap analysis of Photonic Crystal" tutorial given for COMSOL 3.5a to 4.3. I...
View ArticleSkip unsolvable parameters in parametric sweep?
General question. I run a parametric sweep and occasionally one of the parameters causes a simulation that doesn't converge. e.g. the parameters are param = 1, 2, 3, 4, 5 meters and this simulation...
View ArticleCOMSOL in parallel mode: a speedup of 20% using 4 cores?
Hello everyone, I have performed the following experiment. Using the command -np #cores, I have forced COMSOL Multiphysics to use 1, 2, 4 or 8 of the available cores on my computer. I also used the...
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 Articlejava.lang.ClassCastException when using LiveLink from MATLAB
Hi there, I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models. However, yesterday I ran the same MATLAB code as I always do, but...
View ArticleEmpty parameter list
Hi everyone, I'm beginner to COMSOL and I'm modeling hyperthermia cancer treatment with magnetic nano particles. I'm using bioheat transfer for the body cells, mixture model for modeling nano particle...
View ArticleWill the increase of the relative tolerance reduce the solving time ?
Dear all, as mentioned in the title, I would know if the change (specifically an increase) of the relative tolerance in Time Dependent solver (but also in Stationary solver, why not) will reduce the...
View ArticleCluster computing got stuck :external progress scheduling
Dear Mr. Shuhong, While trying to solve a particle tracing model on a 3 computer cluster (1 headnode running Windows Server 2008 R2 and 2 compute nodes running Windows 7) via HPC Server 2008 R2 Pack ,...
View Articleboundary condition
I m new in comsol. i m trying to find capacitance of an electronics device . but i did not get exact result. there is little bit difference between simulated data and expected result. i think my...
View Articlefor zero charge at infinite boundary
for zero charge at infinite boundary can u give me the link or pdf of (model.acdc.geoelectrics.pdf ) document
View Articlecapacitance including fringing field
hello sir i am new in comsol. i am trying to find capacitance of a device ..when voltage of drain=voltage of source=0 volt and gate =6 volt. but i don't know how to put boundary conditions on 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 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...
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