Coupling two physics which use different order of elemnts
I'm coupling the electrical equation (superconductor in ac fields), which generate heat, to the heat transfer equation. The electrical equation uses curl, linear, elements, due to the special...
View ArticleEmpty probes when choosing not to store solutions in output
I have a working piezoelectric material model in which I use a frequency domain study to sweep the frequency; I then measure the electromechanical transduction as a function of frequency. I have...
View ArticleSemiconductor module
I have used the semiconductor module to model the charge extraction from a layer of semiconductor sandwiched between two schottky contacts for a given charge carrier generation profile. I define the...
View ArticleToo large thermal expansion with a small temperature variation
As the title says. My temperature varies only on the scale of a few Kelvins, but still I get a engineering strain of more than 1. I am trying to model an IC engine cylinder made out of cast iron for a...
View ArticleError in burner model.
I am trying to simulate a version of the "syngas combustion in a round-jet burner" where heat transfer in fluids and reactive flow are coupled. The model works fine in the first step where the reactive...
View ArticleMEMS Piezoresistive
Hi team, I hope you are ok, I am working on a simulation of a piezoresistive pressure sensor covered by a polymer layer, to understand the effect of the polymere on the performance of the sensor. First...
View ArticleRing waveguide
How can i design ring waveguide coupled to bus waveguide, i need examples
View ArticleElectrostatic model -AC/DC module
Hello everyone I have to solve electrostatics (divergence V = Electric field ) for a simple model (attached-My Model.PNG). I have to apply AC voltage between the 2 electrodes shown in the diagram....
View ArticleDesing of ring waveguide coupled to bus waveguide
How can i design ring waveguide coupled to bus waveguide in 2D and 3D , i need examples about this subject
View ArticleCoupling between to physics in comsol multiphysics 5.0 (in time)
Hi all, I am trying to model a droplet that impacts on a porous medium and penetrates this porous medium. The first thing I tried is using two physics: laminar two phase flow level set (for the falling...
View ArticleCouple two different pdes with different domains
Hi, I am working on a simulation where I need to couple two pdes. The first one is a pde on the entire domain like this∂h/∂t=F(h,T) where T is solved from the second pde on domain h>h0∂T/∂t=G(h,T)...
View ArticleHaving an issue to get mixture of fluids under time dependency
Hello, I've been having issues with my model on trying to get it to converge. My model is very simple, it is a rectangle( denoted as the cross section of a pancrease) with an inlet of glucose, while...
View Articlestationary results as initial conditions - heat transfer
Hi, Something really simple for you... I begin to work with Comsol 5.0. I was used to work 3.5 version. So at this time it's quite a bit difficult to find my way. Could you please help me to use the...
View Articlephase velocity and group velocity of Lamb Waves
Hi Everyone, I made a cylindrical model surrounded by liquid model made of water, this model want simulate a part of carotid in the human neck. I set the liquid and solid domains about all the geometry...
View ArticleTime Dependent flow model, HELP! Mr. Ivar!
Dear all, I created a cross section of a pancreas denoted by a rectangle with two circles in it denoting islets, which secrete insulin. My model is based off a paper written by peter buchwald. Here are...
View Articleeigenmodes of an acoustic shoebox using BEM in COMSOL
Hi all, Has anyone ever coded a BEM formulation for the eigen frequencies and eigen modes of a shoe box ? I'm trying, but it doesn't seem to be that easy... Basically, I want to solve _only on the...
View ArticleCouple two nonlinear pdes
Hi everyone, I am working on a problem in which hot viscous fluid from an inlet spreads on inclined cold surface. The fluid film is thin so vertical variation of temperature is ignored. The problem has...
View Articleoptimization of a time-dependent problem
Hi, I am working using coefficient form PDE module to compute the exit concentration of an adsorber, which is time -dependent. I have used a set of parameters as difusivity and dispersion to solve the...
View ArticleConvergence problem while simulating a degaussing process
Hello, I'm currently running 3-D simulations of ferromagnetic materials that are being degaussed. When I use the "Magnetic Fields" node it works quite well, however, then everything depends on the...
View ArticleCopper Heat Sink with GaAs atop
Hello all. I am trying to model a problem attached as a picture, it consists of a copper heat sink, and a GaAs block atop it. A voltage of 10V is applied as a Terminal to the GaAs while ground exists...
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