Thermal Stress Evaluation without Solving Heat Transfer Physics
I am trying to generate Thermal Stress about the domain of a spherical body with a coupled 'Solid Mechanics' and 'Heat Transfer in Solids' physics. Instead of actually solving the heat transfer...
View Article[SOLVED] "Solution not initialized" when using Livelink for Matlab
(Documenting for others' possible benefit.) This error happened: ============================================================ Error using com.comsol.model.impl.SolverSequenceImpl/getPVals Java...
View ArticleSolution isn't converging
Hello everyone, I'm having a problem with my simulation, where it isn't converging. It's a very thin plate (10 nm) of graphene, and the dimensions of it are around 0,5 um. I've made a simulation where...
View ArticleAC Electrical Field simulation in interdigit structure
hi I want to do AC filed simulation for interdigit structure. I am wondering what kind of physics should I select and how I can apply AC signal to my structure? I would appreciate any help
View ArticleDefine simple-support boundary condition of a beam (Solid Mechanics)
Hello everyone, I am a new Comsol user and through the past few months I have made simple models comparing the results with some theoretical models. I will bother you with plenty of questions the next...
View ArticleIssues with Full Coupling of Physics
Good day, I am having issues with fully coupling two physics. My system contains the solid mechanics physics coupled with a general form PDE to model concentration change and the diffusive properties...
View ArticleGenerate and plot 3D solution, given 2D solution
Hi all, I'm using weak-form modeling to solve for a vector field u(x,y,z). The vector field has 3 scalar components u1, u2 and u3. I know the functional form of the solution in the z-direction; it is...
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 ArticleElectron/hole generation within an thin solar cell film
Hi there, I'm trying to simulate charge carrier generation within an organic solar cell thin film now (assuming the film is homogeneous). I'm using only three equations now, 1. electron drift-diffusion...
View Articlemodeling dispersive materials at optical frequencies for nano-antennas
Hi all, I'm going to model some nano particles at optical frequencies and I want to use the the refractive index (complex permittivity) given by Palik or Johnson and Christy. In their papers, the...
View ArticleSolid Mechanics - Linear Elastic Material - Thermal Expansion
In the solid Mech - Linear Elastic Material - Thermal expansion node, there are two tabs: Model Inputs & Strain reference temperature, which both contain places to write temperature values. What is...
View ArticleCoupling 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 ArticleGenerating continuous electrons from cathode
Hi, I'm trying to simulate an 13MHz electron gun with an oscillating grid voltage. I have created the necessary 13MHz fields. But I couldn't create the electrons continuously with using "Release from...
View ArticleSurface Plot results not correcly moving
Hello, i have a "moving mesh" problem coupled with magnetic fields. I want to let the domain of a magnet move by a prescribed deformation in the ALE-Interface. It's a sinusoidal movement of a...
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 Articlematerials of a surface mesh element
Hi everyone , I’m looking for a possibility to distinguish the different materials that belong to a single surface-mash-element (for example: a triangle) in matlab? For better understanding - my...
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 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...
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