Particle 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 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 ArticleCOMSOL 4.3a Installation Problem
After installing 4.3a, whenever I open most files (or try to at least), I get the following error in a pop-up window:
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...
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 ArticleDistribution of concentration of species that depends on velocity field
I have set-up a simple rectangular geometry that consists of a rectangle, an inlet and an outlet. As a flow-medium I use air. Next, I have solved for the stationary velocity field, using the...
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