Calculation 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 ArticleComsol 4.3 with Matlab - ACDC Rotating machinery - Identity Pair
Hi Comsol forum, this is the very first time I open a new thread. I want to share (and I hope to solve) the problem which is afflicting me when I try to run a time dependent problem using Matlab 2012....
View ArticleSetting boundary condition for transient modulation of a sector of electrical...
Hi all, I was able to solve a sector of electric machine in static condition. (Full machine is 8 pole I want to solve it for 2 pole) However in transient simulation ( I mean moving rotor). The field i...
View ArticleDC discharge dc.de_4
Hi, I am starting to use the plasma module and I am currently having a look at the DC discharge example (www.comsol.com/showroom/documentation/model/8640/). During the model set up the value of the...
View ArticleSector symmetry on a 1/5 3D electro motor
Hi All, i have a 3D model that shows only 1/5 of whole motor. It has 3 phase and 5 pool pairs. i'm using rotary machinery modul 3D. if i disabled all continuity BC on the outer slice surface, it...
View Articlescattering nanoparticle cross section
Hello Sorry my English is not perfect. I have to make a simulation of a gold nanoparticle (R = 20nm) hit by a plane wave. I have to get a chart: x-axis - wavelength (200nm-800nm​​) or frequency y-axis...
View ArticlePossible to export the streamline coordinates?
Hi, I am only using the laminar flow conditions, I have plotted the streamline after the simulation, is there anyway to get the streamline coordinate from the simulation? I like to export it if it is...
View ArticleLarge Eddy Simulation
hello I want to use Large Eddy Simulation on comsol but I can't found it. Can you help how to do this. thanks a lot
View ArticleLivelink for Matlab material definition issue
Hello, My problem is the following: I am defining a RF model: [...] model.physics().create('rfw1', 'ElectromagneticWaves', 'geom1'); model.study().create('study1'); s1 = model.study('study1');...
View ArticleHelp for a better 3D mesh
Hello! I am a beginner in COMSOL and i need some help with a 3 D mesh! In my model i have to focus on the cylinders and around them. So i need finer mesh for this area but coarser mesh for the rest in...
View Articlephysical adsorption-which COMSOL module
Hi there, I am now working on a model about the absorption of solute by gold thin layer in a flowing cell. The absorption of solute by gold thin layer is physical adsorption. I want to know which...
View ArticleTrouble with Livelink-tutorial
Hello, I am trying to set up the busbar example taken from the 'Introduction to LiveLink for MATLAB'-PDF. I am using Ubuntu 12.04, MATLAB 2013a and COMSOL 4.3a. I am able to proceed until mphgeom() is...
View ArticleWARNING: The relative residual is greater than the relative tolerance.
Dear all, I am doing an eigenfrequency analysis of a free thin layer (0.5x21cm) using the Structural Mechanics Module 4.0. I am working in the physics of solid volume with a very fine mesh (maximum...
View ArticleOptimization Module : Using design variable of previous iteration
Hello, I am using Optimization Module and having some difficulties. I want to use the values of design variable of previous iterations (n-1, and n-2). In other words, can I store the values of design...
View ArticleSpring Constant and Pull-down voltage calculation for MEMS Fixed-Fixed Beam
Hi, I'm new to COMSOL, I had tried models already given and now imported geometry from other CAD software into COMSOL. Please briefly explain me that how can I calculate Spring Constant, k and...
View Articlethe unit of volume flow
Dear sir or madam, I have a problem about the unit of volume flow. I know the standard liters per minute (slm) is widely used in industry. So do we use this unit in comsol? For example, if I give 20...
View ArticleTrying to set up a model for testing shock survivability
Hello all. I am designing a silicon suspended structure that will withstand more than 30,000 G shock. I am having trouble setting up the problem. I was looking for some examples that might be similar...
View Articlemodelling elatic-water interface in Solid Mechanics model
Dear all, I am trying to model a cylindrical phantom which is placed in water under acoustic radiation force. The acoustic radiation force is loaded as a 'body load' which works fine. However my...
View ArticleBending Loss Calculation Procedure For Photonic Crystal Fiber
Hi, I am a new user of Comsol Multiphysics version 4.2. My undergrad thesis topic given by my supervisor is about bending loss calculation using comsol.please help me with the guideline how can i make...
View Articlecopy of part model
Hello. I have two models. And I wont part of one model transferred to a second model. For example, setting drift Difusion DD. Is it possible? And if yes how? Thank you.
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