Hi: 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 ArticleSolidworks model meshing issue
I created geometry of a saddle coil pair in Solidworks and then I imported it to COMSOL using the geometry import option. When I build meshes, it gives error of meshing around edges and corners. COMSOL...
View ArticleMagnetic-structural coupled analysis, result not good
This is part of my thesis. I'm trying to simulate the magneto-structural coupled analysis on a magnetic gear. The attached file is a picture of my result. The cylinder consists of permanent magnets and...
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 ArticleDe-icing of wing
Hi, I'm doing simulation of deicing of wing due to heating up sections of the leading edge of the wing. However, when I go through all the boundary set up and run the solution. I get an error:...
View ArticleError in inductor modelling with Magnetic fields interface
Dear all, I'm using the Magnetic fields interface on an inductor model I'm currently working on. The idea is to do a multiphysics coupling with Heat transfer in solids so that I can compare it with...
View ArticleQuestion about "if" function
Hello, I want to add a volume force to NS equation with a special condition. The volume force is like this: H/Re Re is reynolds number. u2 is calculated from convection-diffusion equation and I want to...
View Articlecomsol 4.2a with matlab R2011a
Hi, I saved the comsol file in matlab as told. The tutorial says open ''COMSOL with MATLAB''. What does that mean? Also i get an error as follows when i run the m file of the comsol model. Undefined...
View Article2D Poiseuille flow, wrong solutions?
Hello all COMSOL users! I was solving a simple 2D Poiseuille flow problem on a rectangle domain. I use the "creeping flow" physical model with the "incompressible" option. And I just set the boundary...
View ArticleWedge-on-Mirror !!
Hello,, How can we design a glass wedge layer tend a 0,5 degree angle from a thin layer in the mirror cylindrical at 3D space ?
View ArticleExport data as .csv or .dat
Hello, I am working on a 2D transient problem. I have the results and want to post processing them. I can easily export data in those formats(csv or dat) and open in Matlab or Excel. I want to select...
View ArticleTemperature 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 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 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 Articlestress tensor-elasticity matrix
COMSOL assumes the elasticity matrix to be symmetric. I need to define an unsymmetric stress tensor but seems that it is impossible in COMSOL. Has anyone experienced such a problem so far? Thanks
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...
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