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Area terms while using Axial Symmetry
Hello everyone, I have what I beleive to be a somewhat simple question. I would like to model simple heat convection out of a cylindrical wire or water pipe. It really doesn't matter what it is, just...
View ArticleTotal Stress Tensor
Hi I am trying to calculate Total Stress Tensor in a fluid.i know that: Total Stress = -pI+Shear Stress(or viscous stress) I want to know what this pressure is in this equation for moving fluids...
View ArticleUnknown 'lm' variables with Diode Example using COMSOL 4.2
I am attempting to replicate the Semiconductor Diode 4.1 Model file found at this address:www.comsol.com/showroom/documentation/model/114/ by starting from a new COMSOL file and essentially applying...
View ArticleComplex valued field in Helmholtz PDE interface
Hello all, I'm working on a model with the Helmholtz Equation interface in 1D. I'd like to be able to make the variable, u, complex in order to get phase information out of the result. I've looked...
View ArticleGenerating UV-Vis Spectrum of spherical nanoparticles.
Hello I am new to Comsol. I was wondering what is the best way to simulate the UV-Vis absorption spectrum of metal nanoparticles, ie Au, or Ag. I understand that I should use Mie Scattering theory. I...
View ArticleLid-driven cavity flow (2-D): Visco-elastic materials
Hi, I am trying to model flow of visco-elastic materials (using Oldroyd-B model) in a lid-driven cavity. In this problem the top boundary/wall is sliding, whereas the side and the bottom walls are...
View Articlelid driven cavity flow
Hi, My problem concerns with a square geometry with an oscillating lid. I wanted to know how to give the boundary condition for a wall to oscillate. Thank you in advance Ameya
View ArticleOscillating boundary condition
Hi, How can we impose oscillating boundary condition in terms of velocity, on a boundary of a defined geometry. Thanks in advance Saurabh
View ArticleWhy we need 6000 Volatge for microgripper
In the microgripper model given at comsol website at linkwww.comsol.co.in/showroom/down...e/models.mems.microgripper.pdf It is written to apply a volatge of 6000 Volt.(written on page 2 of the paper)...
View ArticlePDE
Hi All, how I can resolve a system of equation with PDE and algebric equation in comsol? Grace
View ArticleLid-driven cavity flow (2-D):Visco-elastic materials
Hi, I am trying to model flow of visco-elastic materials (using Oldroyd-B model) in a lid-driven cavity. In this problem the top boundary/wall is sliding, whereas the side and the bottom walls are...
View Articletechnical problem
Hello; I have two problems: 1) For "heat transfer module" time-dependent : We consider a concrete slab : - The lower surface at T = 293.15 K set - The face higher flow q = 200W / m ^ 2 how to represent...
View Articletechnical problem
Hello; I have two problems: 1) For "heat transfer module" time-dependent : We consider a concrete slab : - The lower surface at T = 293.15 K set - The face higher flow q = 200W / m ^ 2 how to represent...
View ArticleProblem with Modeling a multi-stage agitated vessel
Hi all, I am having problem getting my model to run and converge. I am trying to model a six-stage agitated vessel in 2D. I have followed the steps described in the posted modeling of baffled mixer...
View ArticleMEMS:Microgripper
I have considered a default model in comsol , a microgripper and tried to improve it. As i modified the geometry and simulated it, an error occurred the simulation is complete but the opening never...
View ArticleIteration solver, RF module, 4.2a
Dear Comsol Users, I have issue concerning iteration solver in RF Module, I want to follow during the simulations linear residual and linear error, because as you know, these values change for every...
View ArticleAC current in Helmholtz coil
Hi experts I want to solve the Helmholtz coils (following example) but use AC current.www.comsol.com/showroom/gallery/15/ I use frequence domain but face this error:"Failed to find a solution. Matrix...
View Article3d Core, Error: Unknown function or operator
Hello, I have modeled a 3d core with a coil and the coil I have declared Muti-turn coil. And in the simulation I have the following error: Unknown function or operator Name: mod1.mf.mtcd1.intp_edge...
View ArticleStructure with 2D and a 1D truss...
Hello all, I am trying to implement this (see attachment). I guess it should be relatively easy, and for sure lots of people know how to do it :). After "spending" quite a lot of time, I decide to...
View ArticleHeat Transfer in Soils
Hi, I am a comsol user and I want to have a 2d axisymmetric model. In my model, I have a soil sample that I put a steel bar in the soil. I want to heat the steel bar with a constant temperature 500(k)...
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