Temperature Gradient 'flip'
Hello all, I am working with a simple rectangular prism; made of copper. I am heating one face of it, and watching how the temperature changes in time. Once the temperature of the entire geometry is...
View ArticleNeed a Help!! Band diagram & extracting eigenfrequency which I solved with...
I have to plot a Band diagram in 2D Photonic Crystal. I worked in Eigenfrequency model, which I reached via RF module > Electromagnetic waves, Frequency > Eigenfrequecy. After using parametric...
View Articlehelp! error about bandgap_photonic_crystal model.
Hello All? when run the bandgap_photonic_crystal example in RF model,the following error maybe appear at times. Error: Failed to find a solution for all parameters, even when using the minimum...
View ArticlePeriodic boundary condition
Can the periodic boundary condition be applied to a transient model (laminar flow equation). I have a fairly complex geometry which has a repeated pattern. I am hoping that I can use a small subset of...
View ArticleHi: need help on electro-rotation studies
Hi I work on electro-rotation studies through dielectrophoresis(DEP). Problem involves lot of variables, however I would like to know a way to obtain rotational simulation due to DEP? Currently we got...
View ArticleCylinder section modelling
Hello all I wish to model structural mechanics in a section of a cylinder-like geometry consisting of longitudinal bars and radial rigid hoops supporting the bars. The full cylinder is too memory...
View ArticleElectrolyte potential (function) in battery modeling
Hi, I just tried to model a flow battery in COMSOL and I wasn't sure what/how to enter the electrolyte potential in the initial value. I don't even know what's it referring to the electrode (tertiary...
View ArticleElasticity matrix,voigt notation of PDMS
Hi, I am currently working on bio-compatible material based sensor, where i want to use PDMS (Polydimethylsiloxane) as a membrane.But I can not get Elasticity matrix,voigt notation(mechanical...
View ArticleBuoyancy effects for turbulence model
In nitf (non-isothermal flow), the way for setting the Buoyancy force is only can set the volume force(-rho*g)? However in somecase it is not accuracy for compare to the experiment result (the buoyancy...
View ArticleConvection Heat transfer coefficient (hcoeff) Problem
Hi, ALL I am new in COMSOL, and i want to know what are the steps to set up this type of complex correlation for (hcoeff); h= Nu*k/L; Nu=f(Ra,Pr), manually? In the following link, there is a paper that...
View ArticleTime Derivative Constraint
This is the matter: I'm modelling a Gleeble test: a bar is being heated by Joule Effect. Now I've tried to model a feedback loop control, I need to control the Heating Rate, the variation of...
View ArticleCalculating Shapefactor of a isotropical corner
Hello. I am relatively new with COMSOL and is thereby not that good with the different tools and methods in, which to find out different values etc. Currently am I trying to find out a shapefactor of a...
View Article1D plot- Postproccessing
Hello, I am working on a 2D transient problem. I have the results and want to post processing them. I want to plot my results like this: I need to detect the minimum of a derived variable all over the...
View ArticleBeam excited by a shaker
Hi All, I aim to model a simple beam excited by a shaker. I am using the Solid Mechanics. I would like to know how big is the displacement of a particular mode (eg first flexural) when I excite the...
View Articleproblems with an easy heat model
hello, I am starting to use Comsol and I have a problem with an easy model. I have a heat source, that have modelled as a box of copper, and a thin shell of aluminium with an small defect. I want to...
View ArticleLiquid Encapsulated Capacitor
I think I should first start with "I am extremely new to COMSOL" :) That being said, I started working with it a little and now I can finally design a capacitor and have COMSOL calculate the...
View Article2D Arrow Surface Plot -- Arrow Length Logarithmic
Hello, I am plotting a 2D Surface with an arrow surface. I need to scale my arrows logarithmically, but I am unsure whether this scaling is a natural logarithm or a base 10 logarithm. Which is it? The...
View Articlev4.1 RF How to use two or more variables in parametric sweep
Hi I want to do parametric sweep that effects the geometry too. The first variable is the incident field wave length and second is angle of incidence. How to run these parametrics or how to run nested...
View ArticleError: Parameter lists gives empty sweep
Hello, I would like to know the reasoning behind this error in return of a monotonously incresing series of frequencies. Examples: a) 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90,...
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