Grain Modeling
In ComSol 4.2 how can we give different crystal to different grains Please suggest any method , as I am able to change crystal orientation of whole model but not of each boundary unit separately....
View Articlethe electric potential dependent on temperature
hello, please help me i am trying to make a model of an electrode in a cylinder of biological tissue, i want to make the electric potential on the electrode dependent on the temperature of the tissue,...
View Articlethermally resistive layer
Hi everyone, I am modeling a pipe with fluid circulating within by coupling heat transfer and fluid flow and the pipe diameter is defined in the geometry section. i need to define the pipe wall...
View ArticleSimulation of leakage flux from transformer
Hello. I've tried to simulate a quantity of leakage flux from transformer by using COMSOL 4.3a. To do this, I made a simple transformer model with LiveLink for AutoCAD.(I want to attach mph file, but...
View ArticleSessile droplet
I want to put a sessile droplet inside a channel. How to create a droplet of a specific material ? and how do I choose the model ? As a reference I was wondering about the model in one the Paper - A...
View Article2D magnetic field streamline plot from cut plane
Hi, I have a question on the streamline plot. I have build the 3D emf model on 6 parallel bar with the same current density. bar cross section was in YZ plane The 3D streamline could be clearly seen....
View Articlemesh
Hi , I am trying to see the accuracy of the numerical solution with different meshes and I am using analytical solution for comparison. As long as the mesh is refined the numerical model is more...
View Articlehow to define Heat source?
Hi, I use COMSOL to simulate a microheater to heat the polymer waveguide on Silicon substrate. The model is 2D. Silicon substrate serve as the heat sink at 25 degrees. When I set the microheater to 300...
View ArticleParametric Sweep in order to change the location of a point
Hi, I'm using the Parametric Sweep in order to change the location of a point who separate edge into two lengths; each has a different boundary condition. (One defined by me and the other one is the...
View Articlegeometry problems
Hi all, My question is, if you build up a block first, then you build up a sphere inside the block. Is it means that the volume which was belonged to the block is taken by the sphere? If so, is it...
View ArticleElectric Fields - Insulated Electrodes
Hi all, I am trying to simulate electric field around insulated electrodes and placed inside a cylinder containing dielectric material. Could someone help me setup the model correctly ? I am trying to...
View ArticleLoad materials from library with Java API
Hello COMSOL aficianados, We are working with the Java API for COMSOL here. Let's say you want to load the material copper into your model. It seems, according to the manual, that the only way to get...
View ArticleRichard's Equation questions
Hi, I'm trying to use COMSOL to model water infiltration and evaporation in porous media. Few questions in this issue: 1) How do I define a boundary as open boundary for Evaporation. How do I define...
View ArticleGlobal constraint
Hi, I am modelling thermodiffusion of moisture with the mathematical module. Is it possible impose a constraint to the concentration, c, in order to ensure it stays positive.
View ArticleAssigning material properties to an interior volume
I want to assign the empty volume within a closed container to be a fluid and assign material propertied to this fluid. I imported a closed 3D model that is made up of a number of solid parts contained...
View Articlehow to simulate a permanent magnet with vertical movement toward a coil ?
Hello everybody, i want to simulate a permanent magnet with vertical movement toward a coil i've used magnetostatics and moving mesh in comsol 3.5 i defined a constant Br(remanent flux) and a...
View ArticleBC in assembly mode
hello, idk but i am getting an error in running the simulation. I am getting a warning saying: "MUMPS allocation factor increased to 1.44". What does it mean? is it due to the insufficient BC? I am...
View ArticleHow to see the plots after running in batch mode?
Hello! I managed to get comsol to run in batch mode (Linux). However, after I open my newly created output model file out.mph, I do not see any graphs available. I am solely interested in CFD module,...
View Articleparticle deformation througn a contrained channel
Hi there, I am doing COMSOL simulation to see the behavior of a particle flow through a microchannel. There is a area of the channel where particle size is greater than the cross section. So the...
View ArticleModulated sinusoidal excitation
Hi everybody, I have to simulate a piezo transducer. The excitation of ceramics is a modulated sinusoidal excitation with an amplitude of 110V. In Piezdoelectric Devices module, I just can set a...
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