Iterative Solvers for 3D Electromagnetic Waves Problems with PMLs
Dear all,I am having a very hard time with trying to set an iterative solver that does converge for electromagnetic wave problems in 3D when using perfectly matched layers (PMLs). In particular I want...
View ArticleNon-catalytic reaction in Com
I am trying to model heterogeneous non-catalytic gas-solid reactions in a packed bed, in which the material of the solid particles reacts with the gas flowing through the bed and becomes another...
View ArticleHow to obtain beat length (coupling length) of a 3D silicon photonic...
Hiii, I am trying to simulate a directional coupler using COMSOL with Beam envelope method and boundary mode Analysis. However it is getting difficult to identify even and odd modes, as some single...
View ArticleSurface-to-Surface Radiation
Hello! Tell me please different between boundary conditions: heat flux and external radiation source. I have two COMSOL project with thermal analysis: 1) Heat Transfer in Solids; 2) Heat Transfer With...
View ArticleCoffee Moka Pot Problem - Air expansion and fixed volume of water flow
Hello,I am in a student group that is trying to simulate making coffee in a moka pot with a simplified geometry (shown in image). We are trying to get the volume of air in the lower reservoir to expand...
View ArticleSimulation of magnetocaloric effect
In the Comsol conference article, I saw the magneto-caloric effect simulated by A. Noume related to the article, but I do n’t know how it was made, and I do n’t know if anyone can help.
View ArticleModeling gas-solid non-catalytic reaction
I am working on gasification of biomass. In this, char (a solid phase) reacts with carbon dioxide (gas phase) to form carbon monoxide (gas phase). I need to model this system in a plug flow reactor, in...
View ArticleProblem with the convergence of Mooney Rivlin model
Dear all ; Im trying to model an hyperelastic tissue using Mooney Rivlin (MR) model in Comsol. When I use parameter values that satisfies the stability condition (below), the software never converges....
View ArticleMoving source and Time dependent geometry
I was trying to model a moving heat source over a plate. So the area around the source would keep on melting when it is moving. In each time step the material whose temperature is more than melting...
View ArticleSurface Plot vs. Volume Plot
Hello,For my simulation I would like to plot the Von Mises stress of a domain in a 3D Plot Group. However, I get different results if I use a Surface or a Volume within the 3D Plot Group. The stress...
View ArticleHello
I have version 5.4 and it doesn't have an induction heating in the heat transfer physics. Is there an add-on package for the induction heating physics?, and how can I get it ?
View ArticleImporting a complex geometry of a fault into the 3D geological model
Hello,I am struggling with importing complex geometries of fault systems into my 3D geological model in COMSOL. I have tried many techniques and all of them seem to fail. See the description below:1) I...
View ArticleLivelink for Matlab error
Hi All,How do you extract the results in Livelink with Matlab. I can use mphglobal on the tuning fork example but get an error when I try it on a plasma exampleI get an error when I...
View ArticleMake 1D simulation visible in 3D
Hi guys, I'm pretty sure, that this is possible, but I don't know, how to do it. So, my problem uses a cylinder as geometry. However, due to symmetry, I only want to do a 1D simulation to reduce...
View ArticleCustomize the physics equations
Hello everyone,I am modeling a set of experiments in which I need to make some changes to the default equations and relatively new to COMSOL.In the CFD module, what I would like to to do is to make one...
View Article2d- isometric induction heating
I am a senior i working on simulating the response that a aluminum structure has to an external coil. i have built the assembly entirely in comsol and can run the simulation. when i create a new...
View ArticleNew to Comsol: Missing Magnetic Modules Under "AC/DC"
Hello!I am new to Comsol and I am trying to simulate an electromagnet used in my research lab at school. I am trying to use the Magnetic Modules I see in videos, like "Magnetic Fields (mf)" but they...
View ArticleNumerical Wave Tank, Twophase_Flow, Phase Field，the definition about Wave
Dear all, I am simulating a numerical wave tank in comsol, by using the twophase_flow, phase field method. I have found some examples in comsol, I feel confused that how can I make the waveform in 3...
View ArticleCan you give me some advice about piezoelectric materials?
Recently, I have been doing research on two-dimensional phonon crystal plate waves.I have some difficulties about how to set the boundary conditions of short-circuit of piezoelectric material.Thank you...
View ArticleReducing simulation time with two different time steps
Hello together,I would like to simulate the temperature profile during laser drilling with an ultra short pulse laser. The problem is that the pulse duration is 800 fs, but the drilling takes 0.1 s. If...
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