Convergence problem with Open Boundary condition - No viscous stress
Hi, I'm modeling fluid flow through a 2D porous media using Darcy's Law. I intend to estimate fluid flux values across the top boundary of model, however,my desired outputs will be one in which the...
View ArticleDifferent results of Simulation from Solid Mechanics and shell
Hello, I have a problem when doing a simulation with a bend pipe meshed by shell element. The results of principal strains are one time larger than meshed by solid mechanics. But the results of...
View ArticlePDE
I am currently working on COMSOL 4.0a. Can anybody tell me how the variables for stress are defined in COMSOL? Since I want to define a Coefficient PDE, which its diffusion coefficient (c) is coupled...
View ArticleLivelink to MATLAB
Hi everyone I am doing research on obtaining absorptivity of the surfaces using RF Module. I am using Livelink to MATLAB interface. I tried two version of COMSOL with MATLAB 4.2a and 4.3a. At each time...
View ArticleTime dependent study on a 3D multiturn coil inside of an electrical circuit
Hello, I am trying to model the voltage in function of time across a 3D multiturn coil inside of an electrical circuit. To do this I use the Magnetic Fields and the Electrical Circuit physics and a...
View ArticleFluid Structure Interaction module - Water Hammer?
Hello, Can the Fluid Structure Interaction module of COMSOL ver 4.2 be used to solve a water hammer problem? Or, is the Pipe Flow Module necessary?
View ArticleIsothermal contour normal vectors
Hi All, Background: I am mapping the temperature gradients at the solidification front of a laser generated melt pool. However the gradients need to be measured in the direction normal to the...
View ArticleHow to deal with Contact problems, Adhesion!!
Hello Everyone, I am dealing with the topics of contact mechanics and adhesion. In my case, two surfaces are adhered strongly and I would like to model the detachment of contact or treat it as a crack...
View ArticleHow to simulate the water boiling by Level-Set method
There is a good example simulating water boiling by phase field. I am trying to use the Level-Set method. However, I was frustrated by many times of failure. My problem is how to deal with the...
View ArticleSimulation of Stirling Engine
Hello everybody I'm currently trying to simulate the fluid flow in a stirling engine (beta) which I've built from the following video:www.youtube.com/watch?v=X2qssmxA82U You should try building it;-)...
View ArticleWhen to use zero or nonzero conductivity for plasmonics?
Hello, We have looked at the Optical Scattering off a Gold Nanosphere model (model 12415) after trying on our own to solve for the frequency response of a gold nanosphere. We also attempted modifying...
View Articlecalculate resistance of a numeric multi turn coil in freqency domane is to high
Dear all, I hope anybody in this Forum have the same exipiriance width the multi turn coil damane. In my model i have a simple numeric multy-turn-coil domane. My problem is that the calculate...
View ArticleInduced voltage in a coil
Hi, I'm modelling an eddy current testing probe with the AC/DC module. The model is 3D, and I have a transmitter coil with an applied current and also a receiver coil with no current. I'm doing a...
View ArticleCoupling Stationary study -> Time dependent does not work
Dear all, I have a very simple model (attached): a 2D model where I impose an initial strain, that generates stress. This stress will be relaxed by creep. The stress caused by imposed strain is...
View ArticleFluid Structure Interaction
I am trying to find out if there is a possibility to define and solve for a fluid structure interaction problem with a moving solid body within fluid surroundings (e.g. a ball of ice in a glass of...
View ArticlePlotting scattered E field from nanoparticle dimers
Hello all, I am a slightly new user to COMSOL and I am trying to model Mie Scattering off of silver nanoparticles (AgNPs). When computing the scattered field for a single AgNP, the resulting E field...
View Articlecombined time-dependent and stationary solvers
Hi I have a coupled system of solid mechanics and magnetic field, and I want to solve the magnetic equation in time domain and solid mechanic ones in stationary case. they are bidirectionally coupled....
View Articlefinite element method
What COMSOL product is useful in solving a system of coupled (linear) differential equations by the finite element method? Thanks!
View Article3D Model of "Voltage Induced in a Coil by a Moving Magnet"
Hi I wanted to do the 3D version of the Model "Voltage Induced in a Coil by a Moving Magnet" which is in the Comsol Library. I used the same physics, materials and boundary conditions, but...
View ArticleUsing non-linear materials ε(E)
Hello to everyone. I encountered with a problem during using an nonlinear material, where a relative permittivity depends on electric field strength in a certain material. During the simulation I got...
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