heating an object, then cool and then reheat , step function
Hello. I wanted to study the behavior of the von Mises stress that will developed in a spheroidal object subjected to the following conditions. time: 0 --> 3 mins ----- heating at constant...
View ArticleParticle tracing - particle counting
Hello to everyone, Im new to COMSOL and currently trying to work with particle tracing for fluid flow. The model we are working on is part of vascular network and we are using as physics : structural...
View ArticlePML option in COMSOL version 4.3
Hi, I am working through the tutorial "Antenna decoupling using an electromagnetic band gap metamaterial" and stuck at the point to create the PML layers. This tutorial was set up for version 4.2a and...
View ArticleHow to cause flow around a bluff body to go unsteady
Hi all, I'm simulating turbulent flow in a pipe around a bluff body with time dependent solvers so I can look at the vortex shedding that occurs. I'm solving the RANS equations with the standard...
View ArticleElectric potential difference on both sides of a circle edge
Hi, I need to calculate the difference between the electric potentials on both sides of a circle edge. I tried using an Edge 2D and then generating a line graph in a 1D plot group, but that way I could...
View ArticleEigen-frequency analysis of metal grating
Dear all, For a metal grating (see attached Structure_Reference.jpg), now I would like to analysis the dispersion relationship of surface plasmon wave supported by a metal grating, which propagates...
View Articleline integration of scalar field for use in study, not as result
hello, i am having great difficulty figuring out how to use a line integral inside of a study. for example, i am seeking to use the line integral of a temperature field (1st interface) across a line in...
View ArticleCOMSOL capabilities question
How could COMSOL be used to help me in the design of a MEMs acoustics pressure sensor?
View Articlehow to make 2D axisymmetry with Radiation in Participating Media ?
Why I can't chose Radiation in Participating Media in axisymmetry ? or Can I change the coordinate? Like initial I chose the 2D coordinate. Then I modify the equation , let it became 2D-axisymmetry.
View ArticleSolver dependency
Hi, I'm currently doing a simulation that involves free convection and I've read everything I could find on this forum about the subject. Something important that comes out, is that the solver that...
View ArticleIncreasing local mesh density with second block
Hi, Just a quick question regarding how legitimate a technique I've used is. I'm modelling magnets and want to plot the force as a function of distance from the magnets. I've already got this working...
View ArticleStrain reference Temperature
Hi I am using transient themal stress analysis (ts) to solve a 3D problem in Comsol 4.2. My understading is that in order to compute the thermal stresses inside the material geometry, the ts model must...
View ArticleMax. Von Misses stesses do not match.
Hello, I am using COMSOL 4.2a version. I am investigating a simple compression problem on pillars. My aim is to find a maximum stress. This is the following procedure I used looking for the maximum...
View ArticlePlastic bending - is this too much to ask out of COMSOL
Hi, I'm stepping into a completely new area of physics and not sure if COMSOL has the capability. Actually, I'm not even sure if this problem is tractable numerically. Specifically, I want to bend a...
View ArticleAdding a resistor
Hi I need to add a resistor between a voltage source and a device to be modeled (thermistor). The device has high dependence on temperature and electric-field. I am able to model the device alone at a...
View ArticleAdding a heat source in solid mechanics
Hi all I would like to simulate the resonance frequency of a tensile stressed beam with a heat source at the center of it. Can anyone tell me how I add the heat source? Best regards Tom
View ArticleFar field domain, RF module 4.2a
Dear All, I have question concerning far field domain. I have gold dipole on glass substrate, and I want to calculate enhancement of electric field (I applied scattered field). Does any of you know how...
View ArticleHow to apply ac voltage
Hi all I want to apply ac voltage(using piezoelectric excitation) to an accelerometer to perform transient analysis. I have tried the SPICE circuit editor, but it supplies only dc voltage. Is there any...
View ArticleInterpolation Function Help
Good Morning, I'm having trouble using COMSOL's interpolation function, and I was hoping someone might be able to help. I'm trying to load data from a tab-delimited text file. I've followed the...
View ArticleRayleigh Damping in v4.2
Hi, I'm trying to analyze a cantilever beam and I need to change Rayleigh damping parameters (alpha and beta) but I am not able to find them in Comsol v4.2! I knew how to do it in 3.5! Please advise...
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