Perforation Fins
Dear I'm a new user for COMSOL 4.2, so I need help in my project. How can I create a circular perforation in direction of flow through a pin fin as shown in attachment file. please, help me
View Articlek-e turbulence equation in coefficient form PDE
Hi, I am working on gas solid fluidized bed in Euler-Euler model laminar flow Module. The run is fine. Now I want to add k-e turbulence equations in Coefficient form PDE and solve the problem with...
View Article24 slot stator of synchronous machine!
Hi, If we have 24 slot stator, how can we apply three phase excitation to stator. I know how to deal with 6 slot stator but 24 slots are creating confusion. Any help will be highly appreciated. Thanks!...
View ArticlePiezoelectric axis definition
Hi All, I have some questions regarding the piezoelectric physics in the COMSOL. I'm using COMSOL multiphysics 4.3 Correct me if I'm wrong, in 3D model, the axes are 1 (x) (horizontal axis), 2 (y) (out...
View Articlewhy does "Undefined value found in the stiffness matrix" means?
I'm trying to simulate Photonic crystal. As far as I know, there is no need for me to know the stiffness of material in the crystal. However, when I click "compute", comsol always screen error message...
View ArticleWhich surface the terminal voltage should apply to in the electrostatics...
I want to calculate the electric capacity between two metal plates then I do a model in comsol as follow: I draw two blocks with a 2µm gap between them,and the material of the two blocks are set to...
View Articlecoupling a 1D geometry with a 2D geometry.
Hi, I wanted to know if it is possible to couple a 1D geometry to a 2D geometry the way I want to. In fact I am trying to solve a 2D model, but at every point in this model I need to get the solution...
View ArticleEncountering error during meshing
when I try to run a mesh i encounter the following error message: "Edge is much shorter than the specified minimum element size." I do not know what this means and any advice on how to get rid of this...
View Article2D model coupling
I want to couple two 2D models, the first models computes a stationary state and the second should use the result to compute a time dependent model. I thought that with identity mapping I could read...
View ArticleParticle absorption and refraction
Hello. How to simulate refraction and absorption in Mathematical particle tracing module. Maybe I should add another physics. I could simulate reflection by choosing wall condition. Any suggestions?...
View ArticleMesh dependency !
Hello, I wanted to ask about meshing a 3D problem. I'm doing a validation for 3D channel with radiation between the inner side of the channel (surface to surface radiation). I'm facing a problem when I...
View Articlecalculate resistance of a numeric multi turn coil in freqency domane is to high
Dear all, I hope anybody in this Forum have the same exipiriance width the multi turn coil damane. In my model i have a simple numeric multy-turn-coil domane. My problem is that the calculate...
View ArticleTime dependent boundary
Hi all, I have flow through a cylinder, and want the inlet velocity to be periodic [ u(r,t) ]. Im new to comsol and havent been able to find an answer to this. Thanks in advance for any help!.
View Articleprecipitation around grains in porous medium
Hi, I am trying to build a model where the idea is that after a chemical reaction CaCl2 + Na2CO3 => CaCO3 (s) + 2 NaCl. CaCO3 precipitate and is immobile. I am using the Reaction Engineering (re),...
View ArticleImplementation of boundary conditons at liquid-liquid interface
Hi all, I am simulating a liquid-liquid flow in a channel. The liquid-liquid interface appears to be curved as one phase liquid is dispersed as droplets. I have used the laminar flow single phase...
View ArticleMass transport in tube.
Ok, so I solved the unsteady laminar fluid flow in the tube im looking at. Now, I want to add in a mass transport problem. Say I have a sphere of concentrated dye at the center of the tube, and want to...
View ArticleHydrodynamic drag
Hi All, I am trying to simulate the hydrodynamic drag force on a particle of 8um suspended in a fluid which is flowing at a flow rate of 20uL/min through the micro-channel of 15umx15um entrance/exit...
View ArticleProblems with parametric sweep
I have a model that I want to investigate with differens values on at least one of the design variables. If I change the variables value manually and compute, there is no problem but if i use variable...
View ArticleExporting Specific Mesh Data
I am quite new to Comsol so please excuse my ignorance when trying to explain my problem. I am currently working with a model of a redox flow battery, and I am interested in exporting data such as flow...
View ArticleTransmission Spectra in RF module
Hi, I'm a beginner in COMSOL. I am using the COMSOL scripting in MatLab. I would like to know how I can get the transmission spectra as shown in Fig 4 of the file attached below. I am looking to plot...
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