Active medium in laser cavity
Hi,I am new to Comsol, and I am working on simulation of laser cavity. When I simulate the active medium, I just set the imaginary component of refractive index to negative in material properties. And...
View ArticlePeriodic Condition
I'm new to COMSOL. I'm using 5.3a. I was trying to replicate the case presented in https://www.comsol.com/video/modeling-the-thermal-management-of-electronic-devices-in-comsol-aug-9-2018, a forced...
View ArticleUsing Floating Potential for multi PZT mounting energy harvester
Hello sir I sathishkumar doing a project on vibration energy harvester with two number of PZT mounting. Initially I modelled cantilever energy harvester with two piezo electric patch. I calculated open...
View ArticleACDC Electromagnetic dynamic simulation
Hello, I am a Comsol beginner.I would like to study the movements between two cubes, induced by electromagnets positioned on their edges.Picture hereI want to study how the electromagnetic forces can...
View ArticleBoundary condition setting of static liquid in a channel
The question is that I don't know the exactly correct boundary condition setting of static liquid in a channel. In other words, the initial velocity of the liquid is 0. Then I want to ask if i could...
View ArticleClik here to view.
how to split a model in 2 domains?
I have created a 3D Modell. I want to create a domain like the picture drawed (the blue line) can anyone tell me what should I do?
View ArticleClik here to view.
How to refine the mesh in parts of the model？
I havee created a 3D Model. How can I to refine the mesh in parts of the model (like the picture in red circle)?
View ArticleSolution Update - Study modification
Hi All, I have a basic question. I am simulating some mechanical structure in frequency domain for example between 100Hz and 150 KHz, and I want to extend my solution from the previous interval to 100...
View ArticlePEM Fuel Cell
I am simulating Oxygen flow pattern in Proton Exchange Mebrane (PEM) half cell (cathode side). I manage to produce the 3D plots for Oxygen concentration,current distribution, velocity and Pressure....
View ArticleHow to build a three-dimensional model that is symmetry about one plane
I know the COMSOL can build a three-dimensional model that is symmetry about axis. However, how to build a three-dimensional model that is symmetry about one plane?My model is a thermal-electrical...
View ArticleDoes the model of the adhesive force of double sided sticky under the...
Hi, simulating the adhesive force of double sided sticky under the sinusoidal vibration. Two boards are connected by a double-sided adhesive, the upper of them is fixed on a sinusoidal motion shaking...
View ArticleQuery regarding parametric sweep for Particle Tracing module
Hopefully you all would be fine. I have a query regading parametric sweep. I'm doing simulation on particle tracing module. I have set initial position of particles and have given them velocity...
View ArticleAxial Symmetry in User Defined Physics -> Coefficient PDE
Hi,how do I get axial symmetrie in Coefficient PDE? I have a 2D Axial-Symmetry-Model. Whenever I create a new standard Physics, Comsol automatically adds the "Axial Symmmetry 1" as a boundary condition...
View ArticleClik here to view.
Insulating spherical ball inside of the constant electric field
I am trying to model a simple textbook problem: insulating spherical ball inside of the constant electric field [Ref: Griffiths Introduction to electrodynamics 3rd ed Chapter 4.4.2]. You can see the...
View ArticleHow To Disable Diffusion in Two-Phase Flow, Phase Field Model
Hi all,I am trying to simulate a droplet made by fluid 1 (Φ=-1) travel through a channel filled with fluid 2 (Φ=1). The problem is, during the simulation, the fluid 1 (Φ=-1) droplet seems to diffuse...
View ArticleHow to Assign a Electric Potential to a Point(!) by using Comsol Livelink Matlab
Hello guys,I read almost all comsol livelink user's guide, and had a research online about it but i dont see anything about that.I created a 2D model in Matlab Livelink. And in my geometry, i have...
View ArticleHow to use linear extrusion (for temperature) with time dependent studies?
I am working with COMSOL 5.2a. I have a radiation heat transfer problem of several disks (added at different times) with radiation heaters at the top and bottom of the stack. At t=0s I like to start...
View ArticleAnalyzing the temperature increase inside the electrical cable as the...
Hi, I am modelling a single phase electrical cable with insulation layers. The cable consists of live , nuetral and earth wire. I want to make the AC current flow in the cable and analyze the...
View ArticleSum of the fields or losses in parametric sweep, initial conditions
Dear all,I have a question regarding making sum of the fields (5.3 version). I have a material which moves in the cavity, so I made model with the parametric sweep of that moving.As you all now, easily...
View ArticleComsol 5.3a
Hi, I am trying to compute my transformer model in comsol and it is giving me this error Undefined variable. - Variable: comp1.mf.VCoil_2 - Global scope How can I solve this error?Regards, Hassan Bhatti
View Article