cross-section averaged fluid temperature as a function of flow direction
Hi, I am modeling 3D laminar flow with heat transfer in a channel of rectangular cross-section. How can I implement the attached formula for mean fluid temperature? I would like to determine the mean...
View ArticleArc welding
hello everybody, I try to make a simulation of arc welding, how must I proceed to modeling the mobile heat source ?
View Articleerror message!!!!
Hello I am getting the following error message"Out of memory during assembly". How to overcome that? rgds Anup
View ArticleDAE is structurally inconsistent - Induced current in coil
Hello, I am just starting to use COMSOL (4.3b) and I have encountered a problem while modelling. I am modelling two identical multi- turn coils where from one is excited by sinusoidal voltage source...
View Articleweak magnetic field converges, strong magnetic field does not converge
The simulation should analyse the following problem: A magnet is passing by a piece of iron. (sketch.jpg) As Study Step I chose Time Dependent. At first I tried a simple problem, where the magnet was...
View Articlelength before and after force applied
Hi all, i'm a beginner in comcol.Currently i 'm using comsol v.4.. i'm having problem to figure out the length of my model after deformation. I attach the picture of my model for reference. i need the...
View ArticleWhy is "intial concentration"and "calculated concentration" different
I have a diffusion model which contains a channel (125 microns) inside a cylinder of 3 mm diameter. The Initial condition I give for the channel is C=100 ng/ml and for cylinder C=0. But when I solve it...
View ArticleTracing a single particle in an expending pipe in a fluid
I would like to module an finite pipe inside a fluid that expands in time and the effect this expansion has on a near by particle. In the attached illustration, the wired tube is the pipe, and the blow...
View ArticleDEFORMED MESH
i want to use both magnetostatics and transient moving mesh on a magnet. my geometry consists of 2 permanent magnet(fixed on either end), and a permanent magnet in the middle. i want to apply deformed...
View ArticleThermal analysis, AC/DC Permanent magnet motors
Hello everybody. I'm just working on the thermal analysis of PM motor, I am very amateur in COMSOL, but i recently got familiar with heat transfer and AC/DC modules and so on. How and where can I find...
View ArticleElectromagnetic field components as integral expressions
I am trying to evaluate the electromagnetic field near the focus of high NA objective. The most common way to do it is to represent the electromagnetic fields in integral form , for instance -using...
View Articlescattering of 2D array of particals
Hi everyone, I want to simulate the scattering of a 2D array of particals and the partical is anisotrpic.Then I want to compulate the scattering matrix. Has anyone simulated this?I only need to...
View Articlestrain gauges
Hi all, anyone here who know how to model strain gauge into a block model..please help..tq
View ArticleCalculation of residual thermal stress
I have constructed a model for the heating of a block of material with a moving electron beam. The model uses the Heat Transfer module to calculate the time-dependent temperature profile within the...
View ArticleExciting a 2-D structure using current source
Hello :) I have 2-D nano bowtie that I want to excite with a linear electric currents of ∼50 pA (following experimental conditions in TEM) oriented normally to the substrate plane. Thx a lot for your...
View ArticleElliptical cylinder
I am completely new to comsol, so please forgive me for posting a problem I suspect have a simple solution. I have tried to search for a solution myself, unsuccessfully. In a microfluidic problem I...
View Articlecreate composite object from a geometry from mesh.....
Hello, I imported a quite complex triangular mesh ( a real soil pore) . I created the geometry from the mesh with comsol. And then I could do simulation, remesh etc .... It works quite well ... But...
View Article3D geometry with X,Y,Z file
Hi, With COMSOLv4.1, how can input automatically differents points in a 3D coordinate, contain in a csv file and create lines between 2 points also automatically. And after used this curve (sum of all...
View ArticleAdding thermal expansion
Hi, I would like to add some simple thermal epansion to my model, however I do not have the thermal expansion part of the solid mechanics module... Is there a way to add it via the mathematics module?...
View ArticleIgnore geometry boundaries for meshing
Hi all. I am new to comsol and have a problem I could not find a solution to in the manuals. I am using the Electrostatics package (in rotation symmetry 2D) to compute a potential (field) map. I used...
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