How to simulate heating induced by optical pulse travelling in medium
As described in my question about heating by optical pulse; I firstly used the Frequeny domain study of Beam Envelope Method to simulate the electric field distribution in waveguide. And I used the...
View Article90 degree Hybrid
hey! I am trying to design 90 degree hybrid on comsol. My model is ready but the field is not properly propogating in the last coupler. The field vanishes in the lower part of the coupler and hence...
View ArticleCoupled Monopole domain source in pressure acoustics.
Hi there,I am using acoustics module in COMSOL 5.3a to simulate some thermoacoustic instabilities. So, to solve this problem, I'm using pressure acoustics Physics based on the inhomogeneous helmholtz...
View ArticleHow to define divergence in COMSOL 5.5?
HelloI'm using PDE to study a fluid flow problem. My vector field is called u (defined by default). Velocity field components are called u and v ('cause 2D). At some point I want to add an equation...
View ArticleDifferent results from line plot
Hello,I am plotting the magnetic field at the boundary between two domains. However, I obtain different results depending on which method I use for plotting. I first define a Cut Line 2D on the...
View ArticlePrescribed Displacement vs Boundary Load
Hi all,I'm new to comsol and trying to figure something out. I'm making a helix geometry of some thickness, and trying to stretch it along the long axis. When I use a prescribed displacement, the helix...
View ArticleAbout Electromagnetic Field Data Post-Processing
I used the wave optical module to build a multi-core fiber model, in the mode analysis calculation to get a series of electric field diagram, I want to calculate the crosstalk between the two fiber...
View ArticleRandom vibration for a structural shell -contact problem
Dear peopleI would like some advice on how to approach a random vibration issue related to the ROM (reduced order model) calculation process. I am following the example with the bracket model for...
View ArticleDeforming an edge in Deformed Geometry Interface in 3D model.
Hi All,We are working on a comsol model with Solid Mechanics and Deformed Geometry interfaces.In our 3D model, we are using Prescribed Normal Mesh Velocity and Prescribed Mesh Displacement to assign...
View ArticleFailed to find a solution for the initial parameter.
Hi, I am working on MEMS RF switch using electromechanics physics. I want to simulate the pullin voltage. The simulation is working only when using large mesh size. If smaller mesh size is used, i find...
View ArticleHow do I simulate a rigid ball impacting a cantilever beam?
Hello,I am new to COMSOL and I am trying to build a model of a small steel ball impacting a Piezoelectric cantilever beam, similar to the figure .I have not been able to find any tutorials or examples...
View ArticleWater vapor permeability and diffusion coefficient in air
Respected colleagues,I am working with the Heat Transfer / Moisture Transport in Building Materials modules. Regarding the basic input material parameters, there are two options for the specification...
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Result from Study outside of defined geometry
Hello!Currently I am simulating heat transfer with Heat Transfer in Solids and Surface-to-Surface Radiation. Looking at the result for the temperature distribution in my geometry I can see that there...
View ArticleHow to simulate optical pulse induced heating in optical waveguide.
Hi,friend. I want to simulate the heat distribution when an optical pulse is sent to a waveguide. If the heat transfer solid with Electromagnetic Waves, Time Explicit(teew) or Electromagnetic Waves,...
View ArticleLaminar Flow & Transport of Diluted Species Feature
Hi you guys. I have questions about the Transport of Diluted Species module. My work is about simulation of oxygen concentration distribution in a micro fluidic device (micro well). In the well, there...
View ArticleSimple Livelink with Matlab example
Hello,Could someone please get me started with a really simple Livelink with Matlab example please? I am going through the tutorial examples but need a simpler example.Kind regards,Sinéad
View ArticleLoss in heat instead of heat flux at boundary?
Is there a way to simulate a defined loss in heat at a boundary? So instead of having W/(m^2K) you'd have J/(m^2K).Right now heat flux is the only time dependant variable that prevents my model from...
View ArticleLaminar flow and heat transfer in different domains
hello everyone. I would like to coupled laminar flow and heat transfer in different domains. I've try to model it in comsol but I get a convergence error. can someone has already solved this type of...
View ArticleMicrofluidic pipe outlet with free velocity profile?
Hello everyone,I am modeling the flow within a microfluidic system, let's just say it is a straight pipe for the purposes of the question. The direction of the flow could be towards either side of the...
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