Help understanding detailed solver log and time-step size selection
Hello Everyone, Could someone please help me understand what is happening in this excerpt from one of my solver logs? I'm trying to understand what exactly the non-linear solver is 'thinking' so that I...
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 ArticleCalculation of a magnetic field caused by a current density
Hello everyone, I am very new to Comsol Multiphysics. I have created a quadratic conductor loop (height, width and depth) in 3D and have applied a magnetic flux density to it. By using a certain...
View ArticleChanged environment from air to water doesn't alter electric field
Good afternoon, I have two electrodes set apart several microns, with their voltages set to p/m 5 V, and I'm measuring the electric field norm between the two tips. I want to see what would happen to...
View Articlesingularity error
Hi, I am trying to solve a time dependent, 2D, multiphysics problem using "Transport of Diluted Species" and "Electric Current". In my model there are basically 5 domains in series: at all of them and...
View ArticleCalculation of the Magnetic Field generated by a Current
I have a 3D cylindrical wire, surrounded by air. I want to apply 1V across it. I want COMSOL to: - calculate the Current (known the resistance of the wire); - calculate the Magnetic Field generated by...
View Articleweird deformation of ultra thin plate under thermal expansion
Hi, everyone, I am using the structural mechanical module to simulate the deformation of a ultra thin plate under the temperature change. the plate size is: length 100mm, width 5mm, height 0.1mm, the...
View ArticleSingular 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 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 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 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 ArticleMaximum Temperature plot
I'm trying to plot the value of the maximum Temperature in a subdomain during a transient event. Any suggestions on how to do this?.
View ArticleBaw Resonator Problem
Hi I am working on a baw resonator. For our simulation we have considered a 3.5a COMSOL 2D model of Thin Film Bulk Acoustic Wave Resonator in the model archives of COMSOL. So we treid to simulate the...
View ArticleGeneral question regarding dimensionality in Comsol
Hi, I'd like to ask a question about mixing problems of differing dimension in Comsol. My interest in this question comes from electromagnetics, but I think it could be useful in many areas and I...
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 ArticleThin, planar multicoil electromagnet
Hi! I have been trying to model an electromagnet in 3D that is flat and coiled like a spiral on a 2D plane (so the coils get smaller as they progress towards the center of the 2D structure). It would...
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)
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