must i compute the whole programe again?
Hello, I am a beginner of comsol. Most of the time, i made mistakes and got different solution from references. Then i changed Model settings and tried to find the right solution. But usually it take...
View ArticleModelling Metallic Diaphragm
I am a novice COMSOL user using the software for a student project so apologies if my problem below seems simple. I have a 2D axisymetric model of a thin metallic diaphragm (approx 25mm di and 0.025mm...
View ArticleLimiting simulation volume/area or displacement for mechanical model
Hey, while doing a buckling study of an optical fiber I tried including a fixed box around the fiber to constrain the movement of the fiber within this box. Sadly this increases the required simulation...
View ArticleHeavyside-Function and Divison by Zero
Hi I stumble realising a Gaussian-beam like in the tutorial model "Nanorods" (using RF-module). Problem: Part of the wave function has a singularity: constant/z Solution in tutorial: Define a...
View ArticleHow to implement a biphasic asymmetric waveform?
Hello everyone. I'm trying to figure out how to implement a biphasic asymmetric waveform in Comsol 4.3a. I need to be able to use the following electrical simulator settings in order to stimulate an...
View ArticleAdding a Faxen Force on Stokes drag force in Particle Tracing Module
Hi everyone, I am trying to use the particle tracing module with a non-uniform laminar flow in a channel. I am using "Drag Force" to trace the particles' motion. However, the Stokes force is defined...
View ArticleMeshing Error
Hello everyone, i want to attach the electrodes to the boundary of my model , but when i am try to mesh or add the sub domains, it shows me error"Could not resolve subdomain relations" could you please...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
View ArticleAveraged flux
Hi, how to average the time-dependent diffusive flux for pre-defined time intervals at a domain boundary and allocate those (averaged) values to the arithmetic mean of the time intervals? The...
View ArticleComsol 4.2a Produce an report
Hi All, I have been trying to produce a report from the Comsol 4.2a I am using. However everytime I try to do so, it says : Unknown Property Property: funcname In my model, I have an matlab function as...
View ArticleInduced current in a power cable sheath
Dear all, I'm probably missing something obvious, but I am having trouble creating a good model of a single-phase power cable. Herein I want to calculate the induced current in a (copper) cable sheath...
View ArticleEditing Weak Form within RF Module in 4.3a
Hi all, In 3.5a, within the RF module you can edit the weak form yourself by going to Equation System -> (Subdomain or Boundary or Point) Settings (see screenshot). Is this functionality still...
View ArticleDifference b/w von Mises stress and von Mises stress Gauss point evaluation
Hi, Does any one know what is the difference between simple von Mises stresses and von Mises stresses Gauss point evaluation. Also what is the difference b/w the effective plastic strain and simply...
View ArticlePhase Field Method - define parameters
Hi everyone, I'm using the phase field model in Comsol, but I'm not really sure how to define the required parameters, such as: surface tension coefficient, interface thickness, mobility tuning...
View Articleconvergence issues in cojugate heat transfer problem
Hi, I am trying to solve a conjugate fluid flow and heat transfer problem. The problem has a channel with fluid flowing through it and surrounding media which has some heat sources. I am having issues...
View ArticleConjugate heat transfer Interface boundary condition
Hello All, I am new to COMSOL. I am trying to solve a 3-D conjugate heat transfer problem with volumetric heat generation in the solid domain. The problem is more like solving for a temperature profile...
View ArticlePCF, PML
Hi, I am designing a PCF with hexagonal pattern having five air hole rings. pitch = 1 um. air filling fraction = 0.90 i have used circular PML to get the imaginary part of refractive index. what should...
View ArticleAxial flux permanent magnet generator
Hi Dr. Ivar/All, Iam trying to simulate the axial flux permanent magnet generator with two rotor and a coreless stator sandwiched between two rotor. Permanent Magnets are attached on inner surface of...
View ArticleElectron Cloud Confinement
Hi, I am trying to model the confinement of a cloud of electrons in the center of a spherical axisymetric system. The electrons are confined by an electric potential. I was wondering if anyone had...
View Articlecluster computing mpi
Hello, I am trying to run my models from comsol on our University's super computer, and having difficulty with the $PBS_NODEFILE command. Can the PBS_NODEFILE also be used to run generic MPI programs?...
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