Surface reaction and Reactive Pellet Bed
The below post is related to an archived discussionHi all,I would like to model a reaction that occurs on the surface of pellets which are non porous.The reaction scheme: A+B(ads)<=>C(ads)Where...
View Articletemperature per node of the mesh
Hello, My major is nanoscale heat transfer.I'm studying the heat transfer by implementing the transistor in 2D simulation through COMSOL.However, I have questions during my study.Is it possible to know...
View ArticleInserting pressure boundary load on Pressure Acoustics or Solid Mechanics?
Hello everyone!I'm modelling a simple emitter-receiver ultrasonic system with a cylindrical sample between the transducers. I'm using independent Pressure Acoustics interface on the emission and...
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Question about equaton 17 in FEM section of Multiphysics Cyclopedia
Hi, I'm confused about Eq 17 of the FEM section of the cyclopedia: https://www.comsol.com/multiphysics/finite-element-methodIt seems to me the sum does not belong in the last term of eq 17 (going from...
View ArticleDisolving silver ions from an silver electrode into flowing water.
Hello Everyone!I would like to know which physics modules I need to apply to track the concentration of silver ions through a pipe section. The silver ions dissolve in water by ionization (applying...
View ArticleThermal analysis of FDM technique in additive manufacturing silumation by Comsol
Hi Recently i strated to work with comsol multiphysics for FDM simulation ( FUSED DEPOSITION MODELING).My objective is to simulate deposition of a melted polymer, and measuring different properties of...
View Articleroll to roll
i need help in order to simulate the roll to roll cylinder with patterns . in which a fluid element placed on a plastic sheet i want to move this fluid channel between two rotating cylinder. i used...
View ArticleHow to obtain absolute current profile
Good morning to whom it may concernI would like to obtain the absolute value of current on a thermoelectric module and I can't seem to find a way to do it.Thank you in advance for a replyBest regards,...
View ArticlePolarisation and k vector are not vertical to each other
HiI try to simulate a waveguide and I see that the polarisation vector and the k vector are not orthogonal.I did it by the attachment mph file and taking the data into a MATLAB script to take a dot...
View ArticleInconsistent heat flux
Hi,I am new to COMSOL and am having trouble with inconsistent heat flux results.I made a simple model consisting of three blocks. Blocks 2 and 3 are completely enclosed inside block 1. Blocks 2 and 3...
View ArticleSlice plot single slice animation not working properly
Hello, all.I'm using my school's license for COMSOL 5.2 to try to model a gas valve injecting gas into a vacuum chamber. I'm doing a simple model based on two cylinders, one on top of the other. The...
View ArticleNo energy conservation when species is included in the non-isothermal flow...
We are trying to simulate steady state non-isothermal flow with mass transport using COMSOL Multiphysics. Single phase flow - turbulent flow - k epsilon model is used to simulate the flow dynamics....
View ArticleBeam with a linear change cross-section（Tapered beam）
The tapered and change cross-section beamlike component is very common in civil engineering . Here, I want to model a tower of Wind Turbine with beam element (Timoshenko) . I can write a expression of...
View Articlefiber bragg grating sensor
I am trying to simulate fiber Bragg grating sensor using Fabry Perot interferometer and Bragg reflector but i am unable to do. Please help me.
View ArticleDirectivity Patterns of Tuning Fork Vibration
How to draw a directivity patterns of tuning fork in COMSOL
View ArticleDebugging MATLAB Function used by COMSOL
Hi, I have a MATLAB function that uses "&" operators and, although it works fine when I test it in my MATLAB window, COMSOL cannot seem to handle it. I get this error, "Operands to the || and...
View ArticleHow to compile external model coded by C language through Visual Studio 2017?
Dear all:The User's Guide said "Start Visual Studio 2017>Visual Studio Tools>VC>x64 Native Tools Command Prompt for VS 2017 from the Windows Start menu. " However, I didn't find the...
View ArticleNot able to select the boundary
Hii,I want to apply a voltage at a boundary. I selected at "Physics-Boundaries-Terminal" and now I want so select at my model the boundary at which the voltage is applied.But it do not work. I also try...
View ArticleTime dependent material
Hi I have a technically problem with time dependent material. I want to input a electrical conductivity of a material which is complex (has real and imaginary part) in time domain solver. Would you...
View ArticleNonhomogenous initial concentration
I want to model the development of biofilm in a perfusion culture. I model the cell culture chamber as a 2D transport of diluted species. I therefore want an initial concentration in the cell culture...
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