Polarisation 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...
View ArticleCylinder has edges on each quadrant
Hi All, When I draw a simple cylinder it has edges such that it looks like the circular face is made of four quadrants. Also when I mesh the structure since they look like edges, the meshing is finer...
View Article"chladni plate" copyright
I have a question about the application. Are frequency images generated by "chladni plate" application are copyrighted? I would like to use only the image in 2d view (black and white figures) in my...
View ArticleApplying a flux boundary condition with concentration as a limiting condition
Hello,I am using 'Transport of Diluted Species' with a constant flux J0 boundary condition. I need to reverse this flux to -J0 when a maximum concentration is reached at the boundary. And then the flux...
View ArticleCreating a space for vacuum/air in my model
Hi everyone, I am very new to COMSOL so I am just currently learning the basics of the software.I am trying to simulate the electric fields lines in a high voltage feedthrough that is assembled inside...
View ArticleHow to define torsional spring stiffness and torsional damping ratio in the...
Hi,I am doing a simulation analysis of a suspension bridge.The structure is regarded as mass- spring-damping system.Schematic diagram of numerical simulation and governing equations are shown in the...
View ArticleFinding elastic matrix, coupling matrix and relative permittivity
The below post is related to an archived discussion[start here] I want to find Finding elastic matrix, coupling matrix and relative permittivity of Si, Sillicon dioxide, Aluminium and Aluminium...
View Articleplot 1d integral
I have a 2d solution to a PDE and I would like to integrate in y-direction from 0 to 1 and plot the integrated results again x. I am new to Comsol. I thought this should be rather easy to do. However,...
View ArticleElectromechanical (Emi) simulation with COMSOL 4.2
Hi, please can you help me about how to simulate a model under an Electrmechanica (emi) study, because i find just the Solid mechanical, DC/AC and Electrostatics (es).
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