frequency dependence of capacitance to examine influence of harmonics
Hello!I am new to comsol and am still learning a lot of new things, I know my question has probably been asked many times, but I still can't figure a way to solve my problem:I want to simulate a...
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POROUS MEDIA - ERGUN EQUATION IMPLEMENTATION
I’m doing simulation of airflow through porous media. According to the charactheristics of the flow and the geometry, the flow is turbulent, so after doing some simulations, the physics chosen was...
View ArticleErrors when running study - Double Pipe HX
Hi all. I'm very new to COMSOL, and tried to model this file off of one of the included COMSOL modules. I'm trying to solve a double pipe heat exchanger problem, which worked fine with the module until...
View ArticleCharge distribution in a nanosphere
I want to model a nanosphere with positively charged core and negatively charged shell. How can i do it?
View ArticleCOMSOL minimum weight of beam optimization (without optimization module)
I have a model of a beam in the form of a sandwich structure with a certain thicnkess of center region and outer layers I want to perform a simple optimization study where I model the beam as a...
View ArticleHow to calculate coupling matrix of Copper?
Hi, I'm new to COMSOL and I'm trying to model a piezoelectric energy harvester, in which I use Copper for my electrodes. To which I need to fill in the coupling values for it.
View ArticleFrequency modal analysis coupled with electric circuit interface get zero output
I tried to simulate a piezoelectric energy harvester using frequency modal analysis. If I disabled the electric circuit physics, I can calculate the average of electrical potential at the boundary of...
View Articleimpedance boundary condition in transient pressure acoustic
Hello,Reviewing the documentation of version 5.5 I found out that, in time domain simulations for pressure acoustic, only resistive (real-valued impedance) can be modeled using user-defined impedance...
View ArticleModeling Change In Impedance As A Particle Flows Past Electrodes
The below post is related to an archived discussionI am trying to mix the two example Particle tracing and electrophoretic movement....
View ArticleModeling Change In Impedance As A Particle Flows Past Electrodes
The below post is related to an archived discussionI am trying to mix the two example Particle tracing and electrophoretic movement....
View ArticlePhase Change Material modeling
Hello,I am trying to use the Phase Change Material domain in the Heat Transfer in Solids physics for 5.5. My material only undergoes its phase change once during heating up and remains in the second...
View ArticleDuplicate parameter/variable name in piezoelectric material
Hello,I'm trying to simulate the piezoelectric activity of a disc subject to side forces, in a dynamic problem. My starting point is a 2D simulation adapted from COMSOL library: the transient roling...
View Articleout of memory
Hi All, I am using the COMSOL 5.5, and I think the simulation is able to finish its tasks, unfortunately, the plots are not able to show up, whenever I tried to plot the results, the error will pop up...
View ArticleHeterojunction Tunneling
Hi all. I am trying to model a semiconductor heterojunction tunneling for 8 domains , and i got this error when trying to simulate the model."undefined value found in the equation residual vector.there...
View Articlecoupling of solid mechanics with heat transfer (moving heat source)
Hello every one, i'm making a model to simulate heat transfer and thermal deformations at welding with a moving heat source through coupling heat transfer and solid mechanics. when i simulate heat...
View ArticlePower from point dipole to port boundary
Hello. I am attempting a simulation to determine the power arriving from a point dipole to ports in a waveguide. This is a 2D simulation using a frequency domain study in the wave optics module.To do...
View ArticleHow to induce voltage in a circular coil due to the rotation of circular...
Rotor in my model is already rotating, but no voltage induces in the coil. I don't know what I have not defined in it. Can anybody have a look at it for me and guide me?
View ArticleThe walls condition shows the sides to not applicable
Hello everyone, I tried to upload an AUTOCAD drawing into COMSOL in order to simulate the fluid flow. But I am unable to assign the wall BC on the wall inside of the drawing. I have uploaded the mph...
View ArticleDeformed Geometry/ Moving Mesh Tutorial
Are there any tutorials focussing on Deformed Geometry or Moving Mesh?
View ArticleTunneling Current through ATD
I was looking to do some simulation for a tunneling diode I have been designing. It is essentially a silicon dioxide insulator between two polysilicon mediums (of a particular geometry as shown in the...
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