Error in multiphysics compilation.
Hi,I'm trying to run a frug release from a Biomaterial Matrix. When I try to compute for study 2, it said there was an error but I do not know why.Error in multiphysics compilation. Duplicate...
View ArticleExotherm reaction in PFR
Hi everyone,I am really new to Comsol and I am trying to model an exotherm reaction in a plug flow reactor: Species A reacts irreversible (first reaction order), the rate reaction is defined as...
View ArticleFree Bar Modal Participation Factor
Hello,I am just trying to model a simple free-free bar with an analytically calculated longitudinal resonance of 509.18 Hz. The size of the bar leads to a mass of 27,000 kg and an effective mass for...
View ArticleThe two models are exactly the same, it ran well for the first time, but the...
hello,everynoe I did a 3D model for solute transport a few days ago ,and it ran well. However I ran it again today and found that I was getting an error:No consistent initial value found Unable to read...
View ArticleModelling phase change
Hello I've used piecewise continuous 2nd derivative function to define the specific heat during phase change in materials section.But after compute it shows error Piecewise function is out of range....
View Articlemismatch between a simple linear-elastic model and pde-based model
Hi there,Good day! I developed a simple linear-elastic model (2D, plain strain, static/steady-state) using both the structural mechanic's interface and PDE-based equation. However, they didn't match...
View ArticleNano pulse
Hi all,I am trying to create a model for nanosecond pulsed laser-material interaction. I have seen and read a lot of froums and discusions.The following tutorial was good....
View ArticleHow to compute the mass participation factor in 5.3a and newer?
The below post is related to an archived discussion[start here] I was excited to read about the approaches for computing the mass participation factor in an eigenfrequency analysis presented in the...
View ArticleComsol would stop work After long time run
When I use level set method and coupled NS-Darcy to simulation two-phase flow, After about the 60-80 seconds (runnign time is about 24-36 hours), the software would stop work. when i click the stop...
View ArticleFailed to create directory.
Hi I changed users name recently.After that if I tried to run COMSOL5.4 I got error message.Failed to create directory.How can I change directory?
View ArticleCoupling the 3D Magnetic Component with 2D CFD_FSI component using general...
Hi all,I am doing some multiphysics analysis of cantilever beam which involves the CFD fluid structure interaction coupled with magnetic and piezoelectric physics.A piezo cantilever beam in excited...
View Article2D and 3D Sofc model help required
I am working on 2D sofc model , which includes , temprature and current distribution , momentum and mass convervation , electronic and ionic balance. what pysics i can add and how to couple them....
View ArticleModelling custom dynamic equation of motion
I want to create a customized fem model based on a modified version of duffing equation. I know I will be studying geometric non-linearity as well. Other than that I don't know where to start. I've...
View Articledivide boundary into smaller boundar
Dear everyone,How may I divide a 3d cylinder, into 360 equal parts of boundary ( one boudary for each degree) on the outer boundary of the cylinder?thank you
View ArticleUnable to perform last step even with completed convergence
Hi all!When doing a computation, on a model which I introduced earlier in this post, I now have a working model for the Fluid Flow step. The second step would be the Heat Flow. The program is able to...
View ArticleAC Voltage
I placed a nickel rod inside a coil. I wanted to pass AC voltage through the coil and see the effects of magnetic field on nickel rod..I tried a lot but unable to find the required steps.. please help
View ArticleHow do I find wireless power transfer efficiency in comsol?
Hello, I have designed a wirelesss power transfer system using loop antenna in comsol multiphysics 5.4 . I have computed the S-parameter but I am having problems finding the efficiency of the system....
View ArticleVibration of a 3D fixed-fixed string
When I do the eigenfrequency study for the string, all I get are axial modes and not transverse modes. Could someone tell me why it is happening? I ticked the box to include geometric...
View ArticleQuery regarding conjugate heat transfer/multiphysics coupling
Hello,I have a query regarding the conjugate heat transfer probelm. I am solving a laminar flow ("laminar flow" interface) problem with a solid heat source heating the fluid. So I used "heat transfer...
View ArticleImporting the actual temperature data
Hello, I am trying to test my heat and mass transfer model using the actual temperature data collected in the real experiment. As the actual temperature profile data irregularly varies with time, I...
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