how to definite infinite thickness layer ????
hello, I simulate dual gratings by RF Module . But I do not know how to dedine infinite layer. I want to set a port as the light source in the top of the module. The material of the first layer is...
View ArticleSpherical Indentation
Hi, Im trying to model the indentation of a spherical probe into a nearly incompressible material (Hertzian Contact). The model seems to get a stress concentration at a single point rather than a...
View ArticleSynchronous machine (torque)
Hi, I am new to COMSOL. I am tryng to build three phase synchrnous machine model. I have applied three phase voltage to the machine but unable to generate torque in a machine, I do not waht is wrong...
View ArticleDAE is structurally inconsistent - Induced current in coil
Hello, I am just starting to use COMSOL (4.3b) and I have encountered a problem while modelling. I am modelling two identical multi- turn coils where from one is excited by sinusoidal voltage source...
View ArticleThe problem with calculating the eigenfrequency of a structure with PML and...
Hi everyone, I am trying to calculate the eigenfrequency of a structure using the RF module. I use PML and scatter boundary conditions to absorb the scatter field. Since the PML and the SBC make this...
View ArticleUsing a function for Permeability value
Hello! I am new to the software. I am modeling fluid flow through the annulus of a pipe coupled to a porous media and am using the Free and Porous Media Flow physics interface. The permeability of the...
View ArticleWeak Constraints from COMSOL 3.5 to 4.2a
Hi I have seen many posts regarding this but none had any definite answer. I am trying to follow a tutorial which involving Stoke's flow, and have the following problems: 1. "Go to Properties of mmglf...
View ArticleHow to build the dispersion curves for waveguide
Greetings I have a rectangle plasmonic waveguide (Ag on Si with air superstrate) with thickness T and width W. I would like to know what kind of modes can support my waveguide. As I understood, this...
View ArticleNatural convection in heat transfer
I am solving natural convection problem for 5hrs in which first problem start with conduction and finish with natural convection effects for solid liquid interface location. During first 1 and 2hrs the...
View Articleproblem about semi-transparent surface
Hello, i try to make a model about semi-transparent surface by using heat transfer module. i have a point heat source and a glass material in the front of this point source, there is radiation emit by...
View Articlehow to get true dimensions for using interpolation function in the other model?
Hi, I want to ask about using boundary conditions as a result. I found many discussions in the forum and I applied to my model. I segmented my model three parts and I want to use results on the other...
View ArticleFluid Structure Interaction with Contact
I'm trying to simulate a reed valve combining a fluid-structure interaction model with contact (i.e. the reed closing). I have been successful so far simulating the fluid-structure interaction of the...
View ArticleFrequency domain modal analysis of a cantilevered beam
Hello all, I am trying to run frequency domain modal analysis of a cantilevered beam. I have built the model in Comsol 4.1 and have assigned desired material properties. Have applied fixed constraint...
View ArticleHow I can combine two physics (es and emw)?
Hi, could you suggest me how to use 2 different physics inside a comsol simulation? I would like to simulate a system with electromagnetic waves physics and electrostatic physics, in order to see how a...
View ArticleALE moving mesh + electrostatics force calculation are in conflict
Hello Everyone, thanks for all the support or tips you may give on the following problem. I am trying to couple three different modules, to monitor the displacement of a bubble in a channel in 3D under...
View ArticleTwo consecutive physics simulations
I'd like to run one physics simulation (solve for 2D electric field given a particular electrode geometry), and then use the output of the first simulation (the electric field distribution) to input...
View ArticleHow to cause calculated strains from PDE for constitutive model
Hi everybody! I have a quick question for you about implementation own constitutive model. So my model describe shotcrete behaviour and it’s composed from several parts responsible for shrinkage,...
View Articletime discretization in comsol?
Hello, Would you please help me to find general information to know how Comsol works? I need to know more details : how Comsol starts to solve the equations(pde)? or for example time discretization in...
View ArticleMesh concentric cylinders!!!
Hi, I have problems with the Mesh for two cylinders concentric, like a optical fiber but in 3D, the errors are in the Mesh because always received the errors in this part, somebody knows how are the...
View ArticleNo Laplace Pressure (interface curvature) in multiphase level set simulation
Hello everybody, I am simulating in version 4.3 a drop of oil in water with the level set multiphase module coupled with the electrostatic module as in the electrocoalescence example from the model...
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