Limiting 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 ArticleChange in Eigenfrequency due to added mass
Hello everybody, I have a very simple doubt, which is as follows. I have calculated the Eigenfrequency of a clamped plate. Now, I would like to add another body, which has a definite surface and...
View ArticleLumbar Spine Biomechanics_Failed to evaluate variable ( material.parameter.E)
Though i change the parameters (Young's Modulus) for many number of times. I keep getting error messages like these, Failed to evaluate variable. - Variable: material.parameter.E - Geometry: 1 -...
View ArticleParallel computing MatLab Comsol
Hi, I am using Comsol 4.3 with Livelink for Matlab. I run an optimization code in Matlab where i call Comsol to perform frequency response simulations. Now i would like to start two parallel frequency...
View ArticleMetal film with subwavelength size hole: Transmmittance and reflectance study
Hi I'm novice in comsol RF simulation. I'm trying to simulate transmittace and reflectance throught metal film with subwavelength size hole. My structure will consists of Air/metal/semiconductor...
View ArticlePlasticity
Whats the difference between Small Plastic Strain and Large plastic strain? How is a model with contact and friction to simulate? What is important? My models usually have convergence errors when I...
View ArticleMoving Mesh problem/ Electromagnetism / Induction heating of rod
Dear Ivar, I am working over a problem, induction heating of a rod moving inside the furnace with a certain velocity, required to relieve stress from the surface. The furnace is stationary, means the...
View ArticleParticles traveling through boundaries
Hello All, I am attempting to use the particle tracing function on a laminar flow in a small channel with obstructions in the channel. I modeled the design after the lunchtime seminar on the particle...
View ArticleProblems about Periodic Conditions in the tutorial model “Periodic Boundary...
Hi all, Recently I confront one confusion about periodic conditions in the tutorial model - Periodic Boundary Condition. In Periodic Condition, it selects only boundaries 1 and 6 which are parallel...
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 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 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 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 ArticleCOMSOL 4.3 with MATLAB error
I have a problem with COMSOL 4.3 with matlab simulation. The error message is below. ??? Java exception occurred: Exception: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException...
View ArticleDielectric response
Hi, Is it possible to measure the dielectric response induced by electric field of insulation material? I've been trying to do this for sometime now without much success.
View Articleacoustic streaming using surface acoustic wave
I want to simulate the acoustic streaming effects due to a surface acoustic wave....I understand from literature that the acoustic streaming can be obtained using a two subproblem- acoustics and...
View Articletransient heat flux and temperature analysis
Dear all, I am very new to COMSOL multiphysics. I am doing a transient thermal analysis on geometry containing ceramic and aluminum blocks. for the boundary conditions I need to define volumetric heat...
View ArticleHow to export data in excel format?
Hey Ivar, I want to export my figure into excel format. and replot it in matlab. Is it possible ? Thank you very much!! Baofeng
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