Very simple semiconductor simulation
Hi! I'm trying to learn Comsol, but it seems have run into a wall. I've looked thoroughly through the semiconductor_diode model as well as the MOSFET model (in the showroom). However, as I implement...
View Article3d Core, Error: Unknown function or operator
Hello, I have modeled a 3d core with a coil and the coil I have declared Muti-turn coil. And in the simulation I have the following error: Unknown function or operator Name: mod1.mf.mtcd1.intp_edge...
View ArticleStructure with 2D and a 1D truss...
Hello all, I am trying to implement this (see attachment). I guess it should be relatively easy, and for sure lots of people know how to do it :). After "spending" quite a lot of time, I decide to...
View ArticleHeat Transfer in Soils
Hi, I am a comsol user and I want to have a 2d axisymmetric model. In my model, I have a soil sample that I put a steel bar in the soil. I want to heat the steel bar with a constant temperature 500(k)...
View Articletumor ablation model
hello, i am trying to make a model like" tumor ablation" model in comsol Heat Transfer Module but i want to change the current from DC to AC current and i want to plot the electric field distribution,...
View ArticleSimulation of a floor heating
Hi all, I want to simulate a floor heating in a 2D modell. Floor heating systems release about 90 % of heat in the form of radiation and about 10 % in the form of convection. So is it possible to take...
View ArticleCurrent/Charge conservation in AC/DC
Hello, My model has several layers of domains having different conductivity and permittivity. I want current to be conserved in each domain independently. At present, I choose current conservation node...
View ArticleHagen-Poiseuille Flow
I am having problems getting the same result when I try to model the Hagen poiseuille flow as when I calculate it. For more information on Hagen-Poiseuille...
View ArticleMaxwell Surface Stress Tensor
Hi all, I'm trying to calculate the magnetic attraction force between two objects in COMSOL 4.3a, by using Maxwell Stress Tensor. I found four possible Maxwell functions to calculate the force: Maxwell...
View ArticleBoundary conditions in the tutorial model (Periodic boundary conditions)
Hi all, I have question regarding the boundary conditions used in the tutorial model about periodic boundary conditions. In this model a plane wave with a wave-vector with non-zero x- and z-component...
View ArticleDeformation behavior of a liquid droplet impacting a solid surface -...
Hi, Can anyone give any idea of how to recreate the model of the given link?www.comsol.com/papers/8116/ please help.
View ArticleA simple problem on solving Poisson's equation
Dear all, I'm solving a Poisson's equation for a charged cylindrical shell structure. The model has cylinrical and z-invariant symmetries, i.e., only inhomogeniety in r direction exists. On the shell...
View Articlethermal magnetic motor and or generator
Along time ago I had the thought after reading and studying about patents by Edison and Tesla on the development of a thermal magnetic generator and/or motor Has anyone ever tried to follow through...
View ArticleFlooding with COMSOL
Hello, I want to simulate the inundation of the island due to water rise (as external parameter). Can I do it using COMSOL? If yes, Is It possible to combine it with the model of porous media? regards...
View ArticleSimple supported boundary condition in Comsol
Hi, guys. I'm actually studying cylindrical sound diffusers using Comsol 4.3a and I need to add simply supported boundary conditions. Is there any way to do it? I have noticed there's several...
View ArticleSetting initial values for an iterative solver
Comsol user interface shows some options for setting initial values at the stationary study step at 'Initial values of variables solved for'. These are either zero or a solution - but we want to set...
View Articletrack velocity of inflow fluid
Hi all, I have a tube which has an inlet to allow fluid to flows in. Would like to know, how can i track the velocity of inlet fluid flow when it flows inside the tube? By using particle tracking...
View Articlebeam vibration by a shaker
Hello, eneryone. I am doing a project simulating a simple beam structure vibrated by a shaker. The left end of the beam is fixed with the shaker. If I want to set the beam vibration acceleration at 10...
View ArticleHow to solve the problem of negative concentration
I am a totally new user on comsol. Now I try to simulate the mixing in the microchannel without reactions. I use the laminar flow and Transport of dilluted species. There is a similar example from...
View ArticleMie Scattering problem, Csmcol 4.2a
Dear Fellows, I want to find module about "Mie Scattering", but I can not access to this module.www.comsol.com/showroom/gallery/3459/ Is that module still exist in the gallery or not? Thank you for...
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