Why can't I get the right acoustic displacement field for a phononic band gap...
We mainly investigate the forward Brillouin scattering in photonic crystal fiber. Recently we fabricate a PCF with phononic band gap. And the frequency of the core resoant mode just lies inside the...
View ArticleFriction heat due to interface compression caused by sinusoidal vibration
Can comsol calculate the frictional heat generated by the interface compression deformation caused by sinusoidal vibration?Recently, I have been trying to perform sinusoidal vibration on two flat...
View ArticleUnable to install Femlab ecre v3.1 from 2004 CD
The below post is related to an archived discussionUnable to install Femlab ecre v3.1 from 2004 CD. Error. Have tried changing the environment setting. Have tried making win32 bit installer possible....
View ArticleDifference between laser heating and microwave heating
Hi, I got a question about the heat transfer module in comsol. The version I used is 5.3a.There is a electromagnetic heating branch under the heat transfer module, which contains two sub-branchs: laser...
View ArticleHeat transfer in solid and Phase change material
The below post is related to an archived discussion[start here]I developed a time-dependent model for a model that has phase change material. Please see the attached file. The Boundary conditions that...
View Articlehole on block
how can I make two holes on left and right side of block? please I need a detailed explanation. Thanks
View ArticleComsol solver friezes and doesn't use RAM
I am running Comsol 5.5, on win 7, 64 bit, with 32 GB of RAM, Solving a simple thermal stress problem. It was fine around 2 months ago, but now when I run that very same model, the answers aren't...
View ArticleError: invalid ELF header - Trying to call a Matlab function from COMSOL
Steps to get the error:From Ubuntu, I do start COMSOL as:comsol -mlroot /usr/local/MATLAB/R2019b -forcegccWithin COMSOL, under the "Global definitions" node, Functions = "/home/miguel/Desktop/PCE...
View ArticleErrors：Undefined value found Linsolv, NaN or Inf found when solving linear...
Respect Sir or Madam， I have built a 3Dmodel of two-phase flow, But when I was doing transient calculations, the report had a warning: Failed to sample error estimate, use initial value estimate, and...
View ArticleThe Eigenfrequency Study in a FE-BE model
Hi, I am a beginner in COMSOL Multiphysics and use it for the vibroacoustic modelling. In my model, I use the FEM to model the structure and the BEM to model the external air domain. I got an issue...
View ArticleNatural convection in an enclosure
I am facing trouble in convergence for natural convection problem in a square enclosure for rayleigh number (Ra=10^6), for all other rayleigh number( Ra=10^3, 10^4,10^5) the solution is converging but...
View Articlebox model
how can I model a box empty inside? can I do that by let the material of the block is air? kaindly help
View ArticleCalculation of microwave-heated potatoes
Microwave-heated potatoes are calculated using an electromagnetic wave heating module. Frequency-domain calculations and transient calculations are used to study electromagnetic waves and solid...
View ArticleDecompose Shear ( transverse) and Pressure ( Longitudinal) Waves
Hello everyone I have a model which produces elastic waves, from laser heating. Now I need to identify the displacements originated from shear and pressure waves, to focus on shear wave only. currently...
View ArticleRelaxation of a solid geometry with initial displacement to fundamental...
For a given solid structure (Cantilever beam) with size: length=8mm width=4mm and thickness=0.1mm, I want to investigate the transient behaviour for a given initial displacement. The initial...
View ArticleUndefined variable. - Variable: mf.normB (Magnetic and structural field...
Hi, everybody,I have a multiple physical field (magnetic field and structural field) coupling model to be solved.The magnetic field has been solved already. Then I want to use the mf.normB solved in...
View ArticleIntegrating different COMSOL modules
Hello,I'm trying to simulate my physical setup for my master's thesis in COMSOL. It involves the creation of a magnetic field through applying a current to a copper-made solenoid. The magnetic field...
View ArticleCPU Maxing Out
Hi all,I am brand new to COMSOL and just started using the program about 1 week ago, and I am noticing that when running the COMSOL multiphysics solver that my CPU is nearly maxing out (90%+ usage). I...
View ArticleWrong stress distribution
I'm modeling ice flow using a user defined creep strain rate tensor. I'm getting close to the expected velocities but the stresses are much too high and have an odd distribution that I think indicates...
View ArticleSimulating pipe flow
Hello ,I am trying to simulate fluid flow and couple to species transport in a pipe section of diameter(d) ~5 micrometers and it branched into two pipes of d/2 and merger to form a pipe of dia, d...
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