How is defined Temperature when you call it in a function ?
Hello,I am currently on a problem where I have a Temperature dependent heat source, in my formula I put the temperature as "T" variable. The problem is that I am wondering how the temperature is...
View ArticleBullet in a barrel
Hi everybody, I' m trying to realize a simple model of a bullet in a barrel. I am using FSI Module. I set an impulsive pressure at the inlet of the barrel (to simulate the explosion), so that the high...
View ArticleSimple Monopole Antenna
Hello all,I want to design a monopole antenna that works at 900 MHz. I think there is an issue with the feeding method since I can see mismatch in the s11 plot. Could you please check my file and help...
View ArticleError "Repeated error test failures. May have reached a singularity" in a...
Dear all,I have used Comsol version 4.4 for a coupled analysis of electrical field, temperature and fluid dynamic in a coaxial treatment chamber for liquid sterilization using pulsed electric field...
View ArticleConstant phase element?
Hi guys, I am using lithium ion battery module. I wish to simulate a constant phase element (CPE) in porous electrode, but only related thing I can find is double layer capacitor. Is there any way to...
View ArticleInduced Current
Dear All,I'm trying to calculate the EM properties of a detector that admits a cylindrical symmetry. One thing I'd like to find is the current density that is induced by a changing magnetic field...
View ArticleRotate arbitrary 3D structure in comsol
Hi,If I want to rotate any arbitrary 3D strucure, which module should I use?I tried Multibody dynammics and solid mechncis with rigid connector. But I am not able to see any deformation of the...
View ArticleSlip boundary condition to rotating boundaries
I want to see the fluid flow for a rod using rotating machinary laminar flow module. But I did not able to figure out how to add a slip boundary condition to rotating surface.Any suggestions??
View ArticleCannot save after simulaion - Error = End of File Reached
Hello, I am having trouble saving my simulations when they have finshed. I am getting the error message:"End of File Reached. - File block size: 59625584"Also, when I try to plot and/or export the...
View ArticleEigenfrequency VS Frequency Domain to study the E field
Hi all,I am trying to study the evanescent field around a nanophotonic cavity. My structure is very similar to the one from Painter group for the ones who know his work (see painterbis.png). I...
View ArticleAverage along curves
Hi all,I am trying to do something like the projection but not along the straight lines. As shown in the attached figure, I want to calculate data long the solid red curve. As far as I know, the...
View ArticleProblem with evaluation of Nusselt Number
Hi, i'm very new to Comsol e for a College project i'm trying to model a simple case of heat transfer. The model is a circular pipe in which flows water. I set a fully developed laminar flow and i'm...
View ArticleOpen plate co-planar capacitor
Hi all, I'm new to COMSOL, so please bear with me.I head earlier asked about capacitance and its models. Upon spending some time learning my way around COMSOL, I came up with something. What I'm trying...
View ArticlePiezoelectric Energy Harvester - R_Load
Hello,I am doing a piezoelectric energy harvester simulation by using AC/DC and structural mechanics studies. In my model I considered a simple electrical circuit (resistor, external I-terminal) to...
View Article3D Gaussian Non Paraxial Beam formula
Hi all,I am interested to know if anyone would know any leads to build a simulation for a 3D Gaussian Beam in the Non Paraxial case, so the 3D plane expansion wave solution. I mean : should I use...
View ArticleThe meaning of arrow surface plot
Hello! Everyone,I am a new user of COMSOL, and doing the simulation of 2D electric field. I have plotted current density on arrow surface (proportional) , however, I am confused about the different...
View ArticleRMS voltage in time-dependent study
Hello!In my simulations I have two voltages with different frequencies applied to two separate electrodes. I am using an Electric Currents (ECs) module and Time Dependent study for this. I also want to...
View ArticleAdd External UvsI to mf model
Hi,I'd like to measure the EM properties of a detector, and part of this involves connecting it to a circuit and measuring the response to a magntic field sourced by an external current density...
View ArticleModelling Radiation Heat Transfer with Vacuum Component
Hello All,I am modelling a geometry of two concentric cylinders (made of different materials) with a vacuum between the two cylinders in Comsol Multiphysics. I've been able to setup the geometry by...
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