Singular matrix: Void equations error
Hi, I am trying to model an inductor with a magnetic core in 1) Stationary analysis and 2) Frequency domain analysis. I have followed the instuctions in the sample model for a Spiral Inductor for the...
View ArticleProblem with semiconductor device simulation using COMSOL version 4.0
Hi, I am new to comsol. I am trying to learn how to use comsol version 4.0. Since I am interested in semiconductor devices simulation, I downloaded two models ( mos_transistor and semiconductor_diode)...
View ArticleModelling nanotube
Dear all, I would like to simulate the influence of fiber orientation of CNT (Carbon Nano Tube) on some properties, like thermal conductivity and mechanical properties. Please feel free to contact me...
View Articleresidence time distribution in laminar flow comsol 4.2
Hi there, I am new in using Comsol and I am trying to obtain residence time distribution by Comsol, I used fluid flow-single phase flow-laminar flow from Comsol model wizard to model flow between two...
View ArticlePacked bed mean field model
Hi, I am trying to solve the time-dependent concentration profile in a packed bed using the mean field theory rather than the whole CFD definition of the problem. The mass giving rise to the...
View Article2way FSI simulation - deformation of pipe due to sinusoidal flow ...
Hello, I'm going to model a simple artery , here is the model definition: =========== Model data =========== A cylindrical artery with 10mm radius, 1mm thickness and 80mm length is considered with...
View ArticleHow to extrude the polygon?
Greetings I want to get the solid object like at the attached picture (top view). To do this I have created a polygon (type - closed curve, data source - table). Now I am want to extrude this polygon...
View ArticleElectrical Circuit in Electrostatic Simulation
Hello! Is it possible to have a electrical circuit problem connected with an electrostatics problem? For example I want to connect a capacitor with a certain value to my electrostatics simulation. If...
View Articlethe velocity in the "Inductive Heating of a Steel Billet"
Hi, everyone I'm doing the simulation about sliding electric contact, which indicates that a conductor would sliding along another conductor, and they still remains electric contact with each other....
View Articlevacancy transport using drift diffusion eqn
Dear users, I am new to COMSOL. I want to simulate using vacancy transport(drift diffusion ) with current continuity and joule heating equations. But I am not sure which module should I use for drift...
View Articletumor ablation
Hello, I tried a example in the model library (Heat_Transfer_Module / Medical_Technology / tumor_ablation). But when I do the simulation. There is an error: Failed to evaluate variable Jacobian. -...
View ArticleContact Force
Hi, Does anyone know how to simulation contact force in COMSOL 4.3a MEMS module? I am trying to simulate a electrostatic actuated MEMS beam which will make a contact with contact electrode when...
View ArticleHow To Create Cross Section In 3D
I have been simulating Mie scattering in 3D by using symmetry so that only 1/4 of my model has to be solved for. The problem I have is that I would like to plot the solutions of the full model with 1/4...
View ArticleUrgent: Electrical Circuit (AC/DC) problem
How to integrate a model between two nodes of a circuit. as shown in image. Electrical Circuit (AC/DC)
View Articlefailed to evaluate variable jacobian
Hi everybody, i want to do the exapmle of carbon deposition in heterojeneous catalysis at the end when i excute compute i get the following message: failed to avaluate variable jacobian: variable: re....
View ArticleHow to modify element type in comsol 4.0?
I used weak-from PDE a lot for custom physics simulation purpose. In comsol 3.5a, you can set the element shape function type and its order or even specify discontinuous element type in 'Element' tab...
View Articlesingularity. error
Hello, Does anyboday know why I encounter the below error message in Comsol 3.5a? Error: Time 7.86913096623935e-007: Repeated error test failures. May have reached a Last time step is not converged....
View Articlesimulation of solidification or crystallization using Phase-field method?
I didn't find examples in the model libraries that can be referd to. Does anyone can recommend some references to me to read about how to simulate solidification using the phase-field method in COMSOL?...
View ArticleRF module and Electric Circuit
I was wondering if anyone has had any luck using the RF module along with the electric circuit module? Trying to model a dipole with a diode between leg, with an induced voltage across the terminals....
View Articleabout helix geometry modeling
Hi, I am trying to model a spiraling geometry (helix-like) with a complicated cross section. Does anyone know how to do it with comsol 4.2/4.3a? I used the build-in "helix" one but that was with a...
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