Solve es problem first, then solve emw problem using the result.
Hi, In the past I've always just used one physics. Now I want to add two physics domains and am having trouble. Basically I want to: (1) First: solve for the electric field between two non-flat...
View Articleuse command mode
hi guys just i want to ask you how use the command mode in comsol without matlab. how we can be write the program in comsol or when we get the result with the graphical mode how i can find the command...
View ArticleMicrowave heating module - Microwave Oven, time varying frequency source
Dear all, I'm almost new in comsol and I'm not very practice with this software. I'm training with the Microwave Heating module, in particular I'm evaluating the behavior of the microwave oven...
View ArticleEfficient 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 ArticleQuestion about Truss Module and plasticity
I am modeling a reinforced concrete beam using almost an identical model to the reinforced concrete beam that is provided in the COMSOL tutorials/models. I need to model the rebar as elastic-perfectly...
View Article1 physics or 3 physics (turbulent laminair flow)?
Dear all, I need to simulate a situation in which I have two different streams of air seperated by a thick solid. One stream is clearly a laminar flow the other is clearly a turbulent flow. Now is my...
View ArticleFrequency-Domain, Perturbation
Dear all, I'm simulating impedance spectra on a newman type lithium ion battery model. I use one single solver Step: Frequency-Domain, Perturbation. There is one single "Electrode Current Densitiy"...
View ArticleIntegrate one Study in another
I am trying to solve a study with a fluid flow problem and an electrochemistry problem. Both studies can be solved by themselves but if I want to solve them together or use the Velocity field of the...
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...
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 ArticleUsing dependent variable to calculate a material property
Hi, I am rookie when it comes to comsol but I have simple question. I would like to use a dependent variable (potential) to calculate a material property ( such as density of states). So for each...
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 ArticleGlobal variables to evaluate in Parametric Sweep
Does anyone know the syntax to evaluate the velocity at a specific point? I'm running a parametric sweep of my model and in my output for the "Globar variables to evaluate" portion I want to store the...
View Article"Internal error in boundary respecting." and "Out of memory during assembly."
Dear All I have two errors in my microfluidic models about "Internal error in boundary respecting." and "Out of memory during assembly.". At first I tried to simulate the flow of the overall 3D...
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 Articleout of memory during LU factorization ?
I use comsol multiphysics 4.2 to solve a model on my computer(with 2GB RAM), I get the error "out of memory during LU factorization", but when I put the same model into another computer(the same cpu,...
View ArticleUndefined value found
Dear COMSOL Community I have a question regarding the example of the Vanadium Redox Flow Battery (www.comsol.com/showroom/documentation/model/14153/). I have tried to simulate it but I get following...
View ArticleLinear induction motor with AC/DC Module
I'm trying to simulate a linear induction motor in comsol using the Magnetic fields physics in the AC DC Module and I am facing a couple of issues. 1. BH_Cuves and non linear solver: I would like to...
View Article2-Step Full Field followed Scattered Field Simulation
I am trying to solve for the scattered electric field from a gold nanoparticle on a semiconducting substrate, using a 2-step process identical to the example file "Scatterer on Substrate." When solving...
View ArticleSolve es problem first, then solve emw problem using the result.
Hi, In the past I've always just used one physics. Now I want to add two physics domains and am having trouble. Basically I want to: (1) First: solve for the electric field between two non-flat...
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