Thermal energy problem
Hi, In the attached 3D model model I am investigating fundamental thermodynamic physics (usually I do that to understand/check how COMSOL handles the physics before I gonna apply it to my complicated...
View ArticleSolving a 3rd order polynomial
Good day, When using the Distributed Algebraic Equation physics, is there a way to solve a higher order polynomial for a variable and be able to acquire all of its roots/solutions simultaneously and be...
View ArticleContact problem. Static vs Dynamic
I have an impact model; steel presses down soft tissue. I can solve this model in static analysis with prescribed displacement. But when I solved the model in dynamic analysis with prescribed velocity,...
View Articlemembranes coupled with air
I am trying to model the coupled modes of a musical drum with two heads. I need a membrane under tension at either end of a cylindrical shell of air. I can do it with solid shells at either end of the...
View Articlelocal coordinates and material anisotropy
Hi, I am trying to build a 3D heat transfer model of a machine stator coil. As the bulk material is anisotropic i would like to keep the anisotropy consistent around the bends of the coil. This would...
View ArticleChange boundary conditions during a transient solution
Hello, in an acousitc transient simulation, I would like to change a boundary condition during the simulation. I would to impose on this boundary: 1. a pressure condition during the 100 first time...
View ArticleHow to assign a 2D random function as porous matrix property (porosity)
Good morning, I really need your help, because I can't find anything in the help files. I have a model using the the Brinkman Equations module for 2 dimensional porous media flow. I want the porosity...
View ArticleSector symmetry on a 1/5 3D electro motor
Hi All, i have a 3D model that shows only 1/5 of whole motor. It has 3 phase and 5 pool pairs. i'm using rotary machinery modul 3D. if i disabled all continuity BC on the outer slice surface, it...
View ArticleShow parameteric value on plot
I've made a model of a hi-pot test setup to visualize how the electric field changes at a discontinuity as the conductivity changes (fixed potential). I'ts working great, but now I want to make an...
View ArticleScattering boundary condition and port with plane wave
Dear all, I want to simulate the periodic nanostuctures on silicon. now i am using comsol 4.3a version which is not supported PML with port boundary. for that i need to define the Scattering boundary...
View ArticleEigenfrequency of Piezoelectric shunts
Hi, everyone Recently, I try to utilize the coupling modules (Piezoelectric Device+ Electrical Circuit ) to evaluate the eigenfrequency of piezoelectric shunting system. However, I come across some...
View ArticleGraphene in COMSOL?
Hi, I need to build a graphene sheet (for both 2D and 3D geometries) on an underlying substrate for simulating some experiments in COMSOL. Any help on this, as well as subsequent meshing (for...
View ArticleProcessor with DMI bus type which has higher clock speed and max memory...
Hello all, Which is better between Intel Core i7-3930K and Intel Xeon E5-2620 for best computation performance in COMSOL? Let's assume both using 64 GB of RAM. I noted that Core i7-3930K has clock...
View ArticleNonlinear Material Property
Hi, I am using the Electric Currents interface to model the flow of current through a material of a given conductivity (rho). I wanted to make this material have a conductivity that would vary...
View ArticleMixture Three different liquids
Hi All, I'm new to COMSOL Chemistry model and I'm trying to simulated an interdigitated capacitor crossed by a fluid composed of three different liquid (Gasoline, Water and Ethanol). How i can simulate...
View Article"segiter" ?
Hello! I need a help please. what is the parameter "segiter" in pairs contact?
View ArticleCreate a curved cylinder in Comsol 4.3a
Hello, I want to modelling a thermal and mechanical behaviors in a curved pipes to simulate an underfloor model, so i began to draw the geometry in 3D by COMSOL 4.3a version , so the problem i can't to...
View ArticleLiveLink for CAD - can it handle multiple parts?
Hi All, Can LiveLink for various CAD products handle multiple parts or assemblies? All the documentation/videos I have seen on LiveLink show it being used with a single part. Although using a CAD...
View ArticleCoupling 1D Pipeflow to 2D axisymmetric Porous Media
I am working on coupling 1D pipeflow to 2D axisymmetric porous media. The coupling is peformed by averaging the 2D boundary to the 1D point and integrating the 1D point to the 2D boundary. The coupling...
View Articlefailed to converge with smaller scale
I am simulating plane wave in a cube with using two ports and periodic b.c. The solution is fine when I use a cube with 1 mm and for any dimension above that, when I go to micro meter I get the error:...
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