Coupling B/W two solid stress-strain modules
Hi all, I am trying to model a 3D structural mechanics problem with two separate solid stress-strain modules coupled together at the interfacial boundary through equal displacement boundary condition...
View ArticleMesh element volume
Dear all, I have a material property having a different value in a domain and it is function of individual volume of deformed mesh element and undeformed mesh element. Could you tell me how to get the...
View ArticleFinding the location of the maximum of a variable
Dear Comsol Community, I am looking for a way to find the location of the maximum of a variable. Getting the maximum value is easy, but so far I have not been able to get the coordinates of the...
View ArticleAsynchronous Machine time dependent startup, singularity error
Hello, I am trying to simulate a ASM in the rotating machines physics, time dependent. The Stator slots are coupled to the electrical circuit physics for a Voltage excitation The rotor slots are also...
View ArticleGeometric Nonlinearity problem
I have an odd problem. I am trying to recreate the Large Deformation Beam model (www.comsol.com/showroom/documentation/model/204/) before I start my own project to investigate buckling. I was following...
View ArticleStop condition in Electromechanics(emi)
I would like to implement a stop condition similar to what is described for a moving mesh problem. The parametric study would stop when the mesh quality is lower than a certain value, inorder to...
View ArticleVariation of density
Hi everybody! I am trying to get effective index variation with density of material. How can I use this using parametric sweep.I am using COMSOL 4.3.Thank you
View ArticleAbout creation of struturegeomerty
Hi...! I am a student of University of Pune,working on Rf MEMS Switch. I can't get how to create a structural geometry of cantilever beam in Com sol multiphysics. So please help me to create a...
View ArticleMagnetic Force on an armature
Hello I'm dealing with a very simple problem that has been very frustrating for me! I would appreciate if any one can assist me with that. I'm modeling an E-shaped core in 2D magnetic field module. It...
View Articlespecifying materials in Matlab
Hello, I am trying to setup a simple Matlab script to calculate modes of a step-index optical fibre (there is a tutorial model which describes in much detail how to do that in Comsol, but no mention of...
View ArticleTemperature change from expansion of air
I am trying to model the flow fields of a fluid (air) traveling through an orifice. I have a working model that works great using only the laminar flow module. However, the viscosity of the fluid is...
View ArticleAnimation depending on distance
Hello dear Comsol gurus, I have made a CFD simulation (stationary) which is based on the model library example of the static mixer. I have also generated the slices and surfaces to see how my fluids...
View ArticleDetermine Burst Pressure
Hello everybody, I'm working on a mems pressure sensor, I want to know how we can calculate the burst pressure of diaphragm. Any help will be greatly appreciated.
View Articleoutput data to file via script
I am trying to script a model using the .m file and it seems to be able to do everything including the postprocessing but amazingly I can't seem to find an option to simply output the data to a txt...
View ArticlePiezoresistive Coefficients
Hi I want to find out the sensitivity of my piezoresitive cantilver beam. In order to do that, based on the equations, I should have the piezoresistive coefficient (Pi-1): Delta-R/R=(PI-1)*maximum...
View Articleerror geometry
what is this error!? please hepl me Failed to evaluate variable. - Variable: mod1.spf.T_stressx - Geometry: 1 - Boundary: 1645 1646 1647 ... 4656 Failed to evaluate expression. - Expression:...
View ArticleProblem with Mesh when sweeping a geometric parameter
I am making a model of an optical device that is composed of a metal grating, with an air gap below, a dielectric layer below that and a metal ground plane below. All of the geometry is defined with...
View ArticleRemeshing a Deformed Mesh in 4.0a
Hi, I am simulating the heat transfer in biological tissue that has been compressed. First I apply a gravitational load, and next I want to run the heat transfer calculations on the deformed geometry....
View ArticleColors messed up when exporting GIF
Hello, When I export a GIF from COMSOL, often times the color scheme will be all messed up. Instead of a fluid change from blue to red, I will see about 16 distinct colors. This looks terrible and is...
View ArticleNACA 0012 Airfoil with Spalart-Allmaras turbulence model
Hello, I am new to COMSOL and I thought I would start with a relatively simple model: a NACA 0012 airfoil at 0 angle of attack. The domain is small and the mesh resolution is relatively coarse to get...
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