Help with the model of capillary wicking in a porous material
Hi,I was trying to use the model provided on Comsol website to work on a time dependent wicking problem in a paper strip where the width is a not constant value (a 6cm-width rectangular wicking pad...
View ArticleHelp with BC and contact pairs
Hello!I'm new in Comsol and trying to create a simplified track model in 2D, where I'm applying load on the top (of the sleeper). The model has 5 layers: sleeper, ballast, asphalt, sub-ballast, and...
View ArticleHelp with mesh building for a simple 2D geometry
Hi,I was working on a model that couples the physics module Phase transport in porous media and Darcy's Law together. In Comsol Application Gallery, there's an example ' Wicking in a paper strip' where...
View ArticleHow to calculate/export left eigenvectors within the eigenvalue solver?
Dear COMSOL users/employees,after quite some research, I still haven't found a way to calculate and export the left eigenvector to Matlab when performing an eigenvalue study in COMSOL.Some background...
View ArticleHow do you couple the modules “Transport of Diluted Species and Transport of...
Hello, Thank you so much for reading my post.I have to domains that are separated for a thin region that will serve as a semi-permeable membrane. However, I want to specify in one of the domains...
View ArticleFrequency domain modal analysis for piezoelectric device coupled with...
Hi all,What I am trying to do is to build a piezoelectric device with electricalstatic and solid mechanics interface and I coupled it with an electrical circuit interface. In the study I want to do a...
View ArticleProblem with lower coil excitation frequency in Magnetic Field mf module
Dear All,I'm working on the eddy current sensor simulation with the different target material. According to my model, I cannot apply the coil excitation frequency lower than 20 kHz, for example, 1,000...
View ArticleFailed to find a solution. Maximum number of Newton iterations reached for...
Hi All,Thank you so much for taking the time to read this. I am currently encountering some issues with finding a solution for my simulation. For some background, I have a 2D simulation of an...
View ArticleHow to solve the errors in the comsol log file?
Hi, everyone. I used the " Plane wave expansion" approach to set the tightly focused gaussian beam, but when I increased the wave vector count to 100, an error occurred and the log file showed...
View Articlewho know the ''ec.intWe'' means?
In AC/DC，in Electric Currents，in Frequency Domain，in Global Evaluation，what is the exactly expression of ''ec.intWe''?
View Articleshear stress of ZnO and Cu thin films
can anyone please post the shear stress phenomenon when ZnO and Cu materials used as thin film platform? please respond asap.. thank you.
View ArticleModelling Fluorescence Enhancement Near A Gold Nano-Particle
Hi ! Can anyone help me in modelling fluorescence enhancement near a gold nano-particle. I've tried a few times but couldn't succeed. Has anyone done it before?Please let me know if anyone has any clue...
View ArticleDouble-layer charging on an electrode with an ion-exchange membrane.
Hello,Disclaimer: I am new to COMSOL, this is the first thing I am trying to model with the software.I am trying to model an electrode assembly to see what would happen when I place an ion-exchange...
View ArticleAdd mass to end of cantilever beam
Hi, I want to get the natural frequency of a cantilever beam with one end fixed and the other end with a mass. I tried both adding a mass at the end of the beam, and applying a point load. Both...
View ArticlePort propagation constant in Comsol
Dear Friend,Hi ,I want to define a 6-port domain in COMSOL 5.2a. The domain contains 25 identical Rods.I want to excite port#1 and read the powers arrive to another ports.so , I define ports on wall of...
View ArticleMirror surrounding by PMLs overrides Boundary Conditions
Hi,I am new to COMSOL. I am designing a mirror inside air and then surrounded by PMLs. Before I added the PMLs , I added the PMC/PECS and Impedance boundary conditions at the mirror and I was thinking...
View ArticleContact adhesion convergence
I’m modeling ice deformation by dislocation creep with the base of the ice frozen to the rock beneath it. The ice deforms such that the right boundary (initially almost perpendicular to the base)...
View ArticleMesh size decrease making time dependent model not converge for as long
I’m running a time dependent model of ice deformation. Generally, I've experienced smaller mesh sizes improving results. However, I’ve recently been encountering some situations where a finer mesh is...
View ArticleSimulataneously giving boundary load and body load
I want to give a boundary load and then a body load. More specifically, suppose I give initially a boundary load of 8N and then gave a body load for 10 secs. For this 10 sec I want to watch the...
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