thomson coil modeling
Hello! I am modeling a thomson coil. I made an 2D axisymmetrical model of the exciting coil and a conductive workpiece (armature) which is going to be pushed away from the coil in te 'magnetic and...
View ArticleElectric field lines, Current density lines
Dear All, I have trivial issue. I have model which consists of metal nanoparticles on substrate (RF module). After simulation, I want to plot electric field lines (Ex and Ey component) and current...
View ArticleJoule heating on thin films
Hi everyone! I am struggling since quiet some time with a problem in joule heating in thin films. I have a resistor on a microscope glass slide and I am able to simulate Joule heating on the glass...
View ArticleEnergy Harvester using a vibration generator and magnets
For a thesis paper my group member and I are going harvest energy using a vibration generator and magnets. we are using COMSOL to virtually recreate the system. so far we've been able to make the...
View ArticleCoupling Physics (Piezoelectric + Laminar Flow)
Good day, I am currently running a simulation of a SAW device that interacts with a fluid domain. I have managed to simulate the SAW device with the piezoelectric physics but have yet to be able to...
View ArticleDisplay driver Intel Graphics Accelerator Drivers for Windows 8(R) stopped...
Hi, I have a serious problem. I have Windows 7 on my laptop. Every time I try to open COMSOL 4.3b including results or see any plot in this software, my screen become black, and then there is the empty...
View Articleheat transfer optimization
I would like to ask some question about optimization. i have try to optimize my heat transfer model,but i dont know how to define the objective function. i would like to optimize my model to decrease...
View ArticleCoupling Stationary fluid flow and transient solute transport to AC/DC module
Hello, I'm not the most proficient COMSOL user yet, and I have a 2D problem in v3.5a that would seem to be rather simple but has proven difficult to me thus far. My problem is as follows: I want to...
View ArticleChaotic Response of Beam vibration
Hello everyone, I have a very general question about COMSOL. There is a permanent magnet placed on the tip of a cantilever beam. Another permanent magnet is placed close to the beam tip but does not...
View ArticleScript does not work any more
Dear all, I have got a script, that I used to run from Matlab more than 100 times until now and it worked fine all the times. And now, from one day to the other, it produces and error message (attached...
View Articleproblem with time dependent phase transition model
Hi all, I've built a model which involves a phase transition. I want to see how long does it take for the phase transition to occur. when I run the model with range(0,2,800) it gives logical results...
View ArticleParametric Surfaces to 3D object
I've been attempting to use two parametric surfaces from interpolations to define the shape of a 3D solid domain. I'm following steps similar to those used in this previous thread...
View Articlesegregated vs fully coupled solver in comsol
Hi All, I have compared these two solvers for a heat transfer case with surface-to-surface radiation. Acutually simulation results, i.e., temperature distribution in the domain, are quite different....
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 Articleinternal DOF
Hi All, I am running a case with element number of 0.18M, and number of degrees of freedom solved is 311413 (plus 200428 internal DOFs). What is the internal DOF? And I select the fully coupled solver....
View ArticleScatterer on substrate problem
Dear all Hello. I'm a beginner of COMSOL multiphysics. I have tried to calculate the effect of nanostructure on light scattering. Based on the user guide, "Scatterer on Substrate", I did it. However,...
View Articlefrequency domain using reduced basis (modal)
Hi all, I'm trying to make a frequency sweep on a (big) model of an acoustic cavity, with specified surface impedance as boundary conditions. If I use the "Frequency domain" study, everything goes...
View ArticleHiding geometry/domains
Hello, i'm pretty new to comsol. I modeled an IR-Thermopile sensor with the heat transfer with surface-to-surface radiation. In order to realize some convection, the sensor is clouded by air. Question:...
View ArticleResonant Frequency of a Rectangular Membrane
I'm trying to calculate the eigenfrequency of a rectangular membrane. I have the multiphysics 4.3b and MEMS module. I'm modeling a simple rectangular membrane fixed on all 4 sides using structural...
View Articlecasting of aluminium alloy
Hi, i want to model the fluid flow during casting of al-si alloys. I have solved the model for laminar fluid flow but i cannot distinguish the point at which the alloy solidifies and velocity becomes...
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