Modelling 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 ArticleNaN on surface integration
Hi I get a NaNon surface integration of a cut plane but if the integration is on a boundary on the same plane the results are good. Cut planes are easy to define after running the model, Is there a way...
View ArticleHow to use the output (solution) of one boundary in a model as the input...
Hi, everybody! I have a question about the boundary settings in the CFD module. I built an open channel and calculated the fully developed turbulent flow. Now I want to build another channel, which has...
View ArticleCould you please tell me the name of the variable for time steps in comsol?
Hi I am working in comsol 4.2a version for hydrogen storage system modelling. Could you please tell me the name of the variable for time steps in comsol?
View ArticleHelp 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 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 ArticleMaxwell Equation
Hey! I am wondering if it is possible to solve the Maxwell equations with Comsol 4.2a and if yes, which module do I need for this? I found a description of the Maxwell equations in the Users Guide, but...
View ArticleModelling of cryocooler in COMSOL
Hi, I would like to model a heat extractor/cold stage in cryocooler in COMSOL. The cold stage of the cryocooler extracts heat from the attached mass through conduction. The cold stage maintains cooling...
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 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 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...
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