Incorporating Lagrange Multipliers
Hello again, Thanks to the help of those on the forum I was able to incorporate weak constraints to get accurate flux calculations in my diffusion models. However, I am trying to understand how exactly...
View ArticleDeformed Geometry
Hi all, I have a lo of questions and responses related to that but I haven't been able to find a proper solution to the problem I have. Basically, I have a first geometry (domains 1 and 2) which is...
View ArticleCAD IMPORT AND MESHING ERROR
Hi everyone, i m trying to import a .sat file to COMSOL. But after applying meshing at the time of applying stationary study an error is displayed i.e. I am trying to Failure to find a solution...
View Articlearea changes when going from 2D to 3D
When drawing a circle the are changes when going from 2D to 3D in a 2D drawing or in a plane a circle is drawn with radius (57,61/2)[mm] resulting in a surface of 0.002602m² when extruding this plane...
View Articlemodeling of airlift reactor
Hi everyone, I have building a model to simulate airlift reactor for vaccine production. I had following the "modeling of airlift reactor" in model library COMSOL but I can't input mass balance to get...
View ArticleCOMSOL APPCRASH and closed
hi I have a problem for the new server computer using COMSOL 4.3 First of all, the performance of server computer is below. OS: windows 2008 server RAM: 512GB CPU: AMD 6238 (x4) GPU: Geforce GTX 550 Ti...
View ArticleLorentz force
Hi, with the new v4.0a, I miss the predefined Lorentz forces in the AC/DC module. In magnetic field mode (mf), there is at least the Lorentz force mf.FLtz_xyz. In magnetic and electric field mode...
View ArticleArrow color
Hi, all I plotted principal stress volume. So, I have three color arrows; red blue green I know that they represent the eigenvectors of stress tensor. What I want to know is their eigenvectors' color...
View ArticleModeling a Kerr Effect
Hello. I want to model a material with birefringence that depends on the electric field inside the medium, similar to the Kerr effect where the index depends on the square of the field. This is...
View ArticleGeometry variation within Time-Dependent solving.
Hello, I was wondering if it's possible to change geometry according to time ( via internal or external function(MatLab)) ? ie: Making a block depth function of time.
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 ArticleHarmonic Load
Hey, I'm new to COMSOL and I have a few questions about it. I'd like to do a Frequency Response Analysis of a structure with a harmonic load ''shaking'' it with a pre-determined force and frequency ,...
View Articlerigid particle carried by a channel flow
Hi I have to simulate the displacement and rotation of a rigid prticule in a fluid flow and I am not a professional on comsol. So, is there anyone who could help me? or if you have any examples of this...
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...
View Article"zero length" element
I am trying to model a bolt connection in an assembly. In order to do so I would like to place a node at the center of where the bolt hole should be (all bolt hole cutouts have been eliminated) and...
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...
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