heat transfer / convergence problem
Hi, I have a heat transfer problem where I am trying to solve movements and temperature in oil due to a submerged heat source. It seems that the convergence is a problem. There are several solvers...
View ArticleHow to plot the rms value of the electric field?
I am performing simulations of a three-phase cable in the interface electrostatic (es), and have an interest in obtaining the electric field distribution in the cable, as the simulation is time...
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 ArticleEvaluate total force acting on a body
Hi everybody! I made a simulation of a rigid 3d body moving inside a fluid at constant velocity. I used the Stationary Laminar Flow study. Everything works fine, but now how i can find the total force...
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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 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...
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