PML Coordinate Stretching
When I see the equation mode, PML in one of the direction (mapped coordinate e.g. y direction) is stretched to complex number but another remains only real for my 2D analysis, why is that? Also does...
View ArticleMass in not conserved even in conservative form, multiphase flow of water...
Hello everybody, I have previously posted on a problem I was trying to simulate about multiphase flows (Multiphase Flow LS - Air Bubble in Water Cylinder - Conservative forms fails) and I have tried...
View ArticleObjective Function Gradient Components in Optimization Module
Hi, I'm using the Optimization Module with V4.2a to run a parameter estimation on a time dependent model. The error output for the Levenberg-Marquardt algorithm doesn't reflect the convergence of the...
View ArticlePossibility to import a 2D CAD file to COMSOL?
Hello, I am running the last version of COMSOL (4.3b). I tried to import a 2D CAD file to COMSOL but was not successful! Generally, is it possible to import a 2D CAD file to COMSOL or only 3D files? If...
View ArticleHeat source: Temperature profile instead of heat
Hi, I want to use measured values to define a heat source in the "Conjugate Heat Transfer". I could already generate a 3D-function of these values which can be used as Q. But my problem is that the...
View ArticleHeat Generation in a Disc Brake
This is a basic related to the "Heat Generation in a Disc Brake" tutorial model. my question is how to add a layer of grease between the disk and the pad. same for the "Heat Conduction in a Cylinder"...
View ArticleRegarding beam module in structural mechanics module.
Hi all, Do anyone of you how to add beam module to structural mechanics module.Please help Thanks
View ArticleIntroduce material with the loss or gain in Transient model comsol 4.2
Hi, I am working at transient model for optical application(wavelength = 1.55um) with loss or gain material and also nonlinear material. I know that I can put loss/gain into my material by introducing...
View ArticleMoving Mesh ALE - Applied to unconfined groundwater flow with unknown water...
Hi, I am trying to set up a model that was presented in the paper presented at the 2012 Conference in Milan: Simulation of Pumping Induced Groundwater Flow in Unconfined Aquifer Using Arbitrary...
View Articleprincipal stresses
Hi all, I would like to extract the principal stresses and plot them using Matlab. I was wondering if someone had already done it and if yes how? Is is better to extract the principal directions as a...
View ArticleDesign and Analysis of 2D Single Axis Capacitive Comb Drive Accelerometer
Dear Sir, We have been designed 2d Single Axis capacitive comb drive Accelerometer. when i computed electrostatics study to find capacitance i found a large difference between simulation and...
View ArticleEigen frequency????
hi, how can we determine what the eigen frequency of a designed structure is among a list of obtained frequencies..
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 ArticlePerformance problems with Interpolation Function
Hello, I am using a 3d interpolation function with data from a large file (>100MB). When I execute a computation (e.g. an Eigenfrequency Analysis), it takes a long time (~15 min) before the solver...
View Articleheat transfer coefficients
I'd like to know more about the heat transfer coefficients present in the material library. I see that it depends from the surface temperature, from the temperature at infinite distane and from a...
View Articletime dependent load
Hi all, step by step I'm improving myself on Comsol. I have just a little problem with "time". How can I make a time dependent simulation with a random function included, for instance, a force. I know...
View Articleimport a bmp image into COMSOL geometry
Hey, as stated in this webpage: www.comsol.com/products/formats/ Comsol can both read and write few types of images. However, when I tried to import a bmp image as my structure for flow simulation, it...
View Article3D AC/DC simulation with motion? COMSOL 4.2a
Hello, I would like to model a 3D permanent magnet generator moving at a constant rotational velocity. My plan would be to use the AC/DC module combined with the Structural Mechanics>Solid...
View ArticleWhat's the formulation of "mechanical energy flux" in COMSOL?
There are "mechanical energy flux," "complex mechanical energy flux" which I can derive or plot in the result. They are cool but still I want to know the definitions of them, how it calculates, and I...
View ArticleHysteresis loss Modelling of Inductor coil
Hello I have simulated inductor using AC/DC module and I have calculated the inductance and magnetic field around the inductor but now I want to calculate the hysteresis loss in the inductor. For that...
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