Floquet boundary conditions in multilayer structure.
Hi all, I am trying to simulate a multi junction solar cell (for eg: Si/SiO2/Al) and trying to study the electromagnetic behavior of it. For periodic conditions I had used floquet boundary conditions,...
View ArticleCoupling Electrostatic, Structural and Acoustics
I am currently trying to couple 3 different physics for my electrostatic transducer. The coupling works in the following mode: Bias or static mode and time harmonic / frequency response mode. For bias...
View ArticleJob option in Batch command
Hi all, I add trouble when using the batch command recently. I prepared one file with a parametric study (different amplitudes are used in a time dependent problem). I didn't try yet the -pname and...
View ArticleError - 3D LID Driven Cavity Flow
Hello Forum, i try a computation for the "3D lid-driven cavity flow" model. I got a Comsol Error: Failed to find a solution. Divergence of the linear iterations. Returned solution is not converged. I...
View Article2 Separate Stranded Coils in Multi-Turn Coil Domain
Hi all, I have 2 separate stranded coils to be modeled for transient behavior (Current Pulse input). Since these coils are not of regular shape (linear or Circular), i had to go with numeric coil type...
View ArticleCUDA and COMSOL
Dear all, I have a new NVIDIA Quadro GPU and I would like to use it to accelerate my simulations, is it possible to use it somehow? I looked for some informations and it seems to me that CUDA it's...
View Articlewhy it is different between Axial 2D and 3D in Non-Newtonian Flow.
Hellow, i have used this for about 2 weeks. but i have some problems. so i need some help. i drawn a model of the cylinder which is same both them. and they are same values, boudary conditions... but...
View Articlesmart parametric sweep?
Hi, I was wondering if in Parametric sweep it is possible to update Study Settings based on the up-to-date results of the computation (i.e. based on the results computed from the previous step of the...
View ArticleA SMALL DOUBT ON PORT POWER VALUE !
Hi all, I am new to this software and I am trying to simulate a multi-layer structure on which plane electromagnetic wave is allowed to fall at normal incidence. I kept the port power at the default...
View ArticleNew to COMSOL - Issues with Modelling a MEMS Coated Micromirror (2D)
Hi, I am new to COMSOL software, however I have started building a 2D model of a MEMS Micromirror with a thin film coating of SiO2. My aim is to match experimental results regarding the radius of...
View ArticleComments on an old topics
Dear Ruud, I have a question about one of your reply on an old topic:www.comsol.es/community/forums/general/thread/16346/ I also want my solver to use the previous result to calcule the next one, but...
View ArticleTwo electrodes, four layers
Hi everyone! I am trying to do simple model using 3D Comsol Multiphysics // AC/DC module // Quasi Statics, electric // time harmonic analysis ... two electrodes, 0.5V and -0.5V, four skin layers with...
View ArticleSimple 2D model
Hi everyone! I am new around here and I have to solve this problem: I have to model human skin with two electrodes on top. Skin has 4 square shaped layers, different permitivity and conductivity....
View ArticleGhost domain, bug?
I have a curious problem with Comsol (4.3b and 4.4) with ghost domains. If i look at the geometry and select all domains, i have, ie 10 domains. When assigning materials, then the 11th domain appears...
View Articlecomb drive actuator
I am trying to simulate a basic comb drive actuator in comsol. The electrostatic force in y-direction is coming negative,although it should come positive. Kindly help me out as soon as possible. I have...
View ArticleEffect of magnetic field on vibrating cantilever beam
Hello everyone, I'm a new user and I am currently facing a problem on simulating the effect of magnetic field on vibrating cantilever beam. My model will include placing one permanent magnet on each...
View Articlecomsol error failed to evaluate variable
Hi, i am trying to design spiral inductor using the physics "magnetic and electricfield(mef) but i have this error Failed to evaluate variable - Variable : mf.normB - Geometry: 1 - Domain: 2 3 4 5 6...
View ArticleProblem of using femtime() in COMSOL 3.5a
Hello all, I use femtime() in matlab to solve a dynamic FE problem as follow: fem.sol = femtime(fem,'Tlist',tspan); where tspan is an equally distributed time list. tspan = [t0,t1,t2,...tn]. Now, I am...
View Articledefine mixed boundary condition?
Hi to all, How can i define a mixed boundary condition? I can not find a way to write an equation like du/dx = (alpha/beta)*u alpha & beta are constant. Tanx.
View ArticleStress gradient of anisotropic material
Hi, I am using the anisotropic Silicon material parameters and was wondering how to apply a stress gradient to this. I've tried some equations manually and I'm not getting the same results from my...
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