Encountering 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...
View ArticleTransient elastohydrodynamic squeeze film interaction
Hi COMSOL geniuses, I am trying to do exactly this with the Fluid Structure Interaction Module. www.comsol.com/showroom/documentation/model/14109/ I am running a 2D axis symmetric simulation and would...
View ArticleUsing integration coupling variables
Dear all and Ivar Kjelberg, I used to integration coupling variable--->Point variables in order to derive integration velocity (u) and I got displacement (dr) in results for the case of 2D. But...
View ArticleVery high displacements shown in resonating MEMS devices
Hi, I have been modelling several structures of MEMS resonators and when I do the eigenfrequency analysis, I am getting displacements of the order of 1 m while the size of the structures is of the...
View ArticleData export to text in 3.5a
Hello all, Could you kindly tell me how to - 1) export data from a Cross section plot to text file? 2) How to plot two sets of data along the same plot? Thanking in advance.
View Articlehow can i print pdf doc
Hello using my spare time to start learning 4.0, I ran into a basic and unexpected difficulty: I tried to print portion of the pdf doc for off screen reading.. [ I have the 3.5 book but 4.0, as an...
View ArticlePhotonic crystal fiber
I am trying to model a photonic crystal fiber with liquid crystal filled holes.. I am a starter and it would be really helpful if any one can help me regarding the resources from where i can learn the...
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