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How to Couple Electrostatics with Charge Density Continuity Equation?
Hello,I am trying to couple electrostatics module with charge density continuity equation, for which these three equations need to be coupled:The first two equations are provided in Electrostatics...
View ArticleChamp magnétique, 2D axisymétrique ou 3D
Bonjour à tous, Mon probleme est surement tout à fait basique, mais en essayant de modeliser un simple fil parcouru par un courant électrique, je n'arrive pas à obtenir le champ magnetique induit...
View ArticleSet point source programmatically
Hi everyone,I'm experimenting with COMSOL's livelink to Matlab. In general, this is quite useful to programmatically set and run the models etc., but a few things I just cannot figure out. One of them:...
View ArticleHow to distinguish the correct mode and wavelength for photonc crystal fiber?
Hi all, I have simulated a structure with 3 different materials in the geometry of fiber which should have different loss with different wavelength. In fact, I should find the best fundamental mode in...
View ArticleSemiconductor Initial Values
Hello,I am simulating an optoelectronic device by having a laser exciting a semiconductor substrate. Can someone explains what the Initial value node does? If I have an steady state and a transient...
View ArticleGenerating contacts
I've created a geometry comprising an interlocking microdome structure sandwiched between two solid blocks, but there is some problem with the transmission of pressure because of the contacts. I've...
View ArticleCreate interpolation function using LiveLink with Matlab
Hi everyone,I would like to create a user-defined interpolation function using LiveLink with Matlab.Here is what I do (in Matlab):model.component('comp1').func.create(int2, 'Interpolation');...
View ArticleProblems with parameter setting in lithium-ion battery modules
1、What is the cross-sectional area Ac in the one-dimensional lithium ion battery module? How do I set it? 2、Assuming that my one-dimensional model has "solid heat transfer", how should the...
View Articleproblems about laser annealing
in the paper, Numerical Simulation of Si Nanosecond Laser Annealing by COMSOL Multiphysics, why the size of figure 2 can be much smaller than figure 1? in my own experiments, if i increase the length...
View Articlehigher order mode
Hi all, How can I find or understand the higher order mode? I have a lot of fundamental modes. which one is the higher one? How can I find? thanks
View ArticleDeleting geometry which lies outside of domain
Hi everyone, I want to delete the segments of the cylinder geometries which lie outisde of the domain of the cube, and keep the segments which lie within the cube using the application builder coding....
View ArticleParticles disappear after releasing
Dear all,I am facing a problem in my model that I've dealing for teh past weeks and connot solve. I am new at COMSOL so any help will be well received.Basically, I want to model a non uniform particle...
View ArticleRotational Friction
Hi everybody, I have checked out your blogs but I have not been able to find how to do a 3D simulation that get the heat from the friction between two boundaries with only relative rotational speed. I...
View ArticlePeriodic boundary conditions and meshing controls.
Old unsanswered topic:Are mesh control boundaries compatible with faces that are part of a periodic condition?I have a mesh I'd like to optimize with the mesh control operations but so far I've noticed...
View ArticleHow to mesh thin wires imported from STL files
Hi,I am trying to import and mesh thin wires (20-30um in diameter) from STL files, but came across the following issues:1) I can import the STL files, but when messhing, it could have "Self...
View ArticleCustom Model - Structural mechanics
Hi,I am new in COMSOL and I developed a visco-hyperelastic model for some materials. How Can I introduce this custom model in COMSOL to make an structural mechanics analysis?Thanks for your comments.
View ArticleRotating Mesh - Mesh Overlap/Discontinuity at Boundary
Hello,I am trying to model a 3D scenario in which a cube is placed within a channel and is experiencing a crossflow while the cube is rotating. I am rotating the cube by encapsulating it within a...
View ArticleSemiconductor Module: Periodic Boundary Condition
Hello,I need to apply a periodic boundary condition, but it affects my initial values when I use it. I follow the documentation dedicated to this topic, but it did not work. Do you know about any...
View ArticleDifferent results in RF module versus Wave Optics module?
I am simulating a metal bowtie resonator (on the order of 100 microns in size) on a substrate and investigating its optical response in the THz range (0.1 - 1 THz). I just want to simulate a single...
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Variable Coefficients in Coefficient form PDE
Hello,I am working to solve the following two equations in the attached images in COMSOL for a non-dimensionalized reaction diffusion problem. I am using the coefficient form PDE module in COMSOL 5.3....
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