Mesh continuity at boundaries
Hello, I'm starting with Comsol, and I have this question, that may sound really basic to many of you. I have defined a contact pair between two parts of my geometry - an assembly. Now I would like to...
View ArticleParticle trajectories
Hi I am trying to +vely charged massive particles being accelerated through a tube. They then hit a dynode which creates photoelctrons which in theory should propagate perpendicularly to the incoming...
View ArticleDefinition of diffusion coefficient function
Hi I am trying to model the drying of a cylindrical part by using the "transport of diluted species" module. In this model, I specified the temperature dependency of the effective diffusivity...
View ArticleOptical coupling between laser wave-guides and optical fiber
Hello Everyone, First of all, I am a beginner to use this software and getting to know this from the tutorials posted. I am trying to model 'Optical coupling between laser wave-guides and optical...
View Articleerror "cannot evaluate expression"
Hi, there is an error information when I solve two 1D-PDE models in comsol. How can I solve it? Thanks a lot. By the way, I don't select any material, since the value of the solutions mean density...
View ArticleDrude Model in Transient Simulation
Hi, I am trying to simulate in time domain the propagating wave along a metal/dielectric interface, where the metal permittivity is following the drude model. The way I approached that problem is that...
View ArticleInformation required for Electrical Contacts and Ceramic Plate materials
In my MS research, I am fabricating Thermoelectric Module from Bismuth Telluride (Bi2Te3) Thermoelectric Elements with ZT about 0.9 at 300K for both p-type and n-type. I want to ask that; 1. Which...
View ArticlePossible to export the streamline coordinates?
Hi, I am only using the laminar flow conditions, I have plotted the streamline after the simulation, is there anyway to get the streamline coordinate from the simulation? I like to export it if it is...
View ArticleModeling a complex structure
The structure I'm modeling is very complex. it's a double layer structure with one wrapped outside the other. The structure is on nanoscale, so the mesh has to be really really fine. Due to the...
View ArticleFlow dependence on coordinate system?
I am working on modeling fluid structure interaction, and I have found that the flow changes whenever I move my model to a different location on the coordinate system. I literally selected everything...
View Articleminimum time value under condition
Hi I have a problem on my simulation I have a time dependent simulation and I want to get the minimum time value when a phenomena occur ( The voltage V raise a value above a certain threshlod) I want...
View ArticleLift and Drag coefficients - 2D stationary turbulent k-epsilon flow
Hello, I am starting with COMSOL, and I have made a 2D flow simulation around a multi-element airfoil for a project at school. I used a turbulent k-epsilon flow for my model. After reading multiple...
View ArticleDifficulty in finding S-Parameters
I want to calculate the S-parameters, but I am not able to. I am using this expression:emw.S11. It shows an error, Iam attaching the error with this message. I would be glad if somebody can help me.
View ArticlePlotting the mesh of a cut plane through a 3D model
Hey guys, So i am currently doing some simulation involving parallel plate capacitors and i just want to see the difference between the meshes outside and within the capacitor. I've tried to create a...
View Articleconvert imported *.stl into solid
I am importing a rather complex geometry into COMSOL from Solid Works. After some tinkering with the import controls, I managed to import the object but I do not think COMSOL recognizes it as a solid....
View ArticleSurface evaporation, condensation
Hi, I want to model surface evaporation from a water flow at 40 Celsius and observe the consequent condensation on a cold surface. Can you help me with the model that I should use? I could not find...
View ArticleFace Cannot Be parameterized
Hi all; I try to import a STL file to Comsol 4.3a but this error appeared "Face Cannot be parameterized"? Any help? Thanks in advance :)
View Articleelectrostatic force cause displacement in parallel plate capacitor in COMSOL
Hi, I have been designed a parallel-plate capacitor in COMSOL. Where one plate is connect to voltage of 10V and other one is connected to GND. and a air box is around the parallel plate capacitor. As I...
View ArticleNew "Introduction to COMSOL Multiphysics" book now available
Hello, We are pleased to announce that a new version of the "Introduction to COMSOL Multiphysics" book is now available for immediate download...
View Articleerror in statonary analysis of a biased resonator
Dear comsol community, I'm working on comsol4.2a , I would be glad if i can get a solution for my following two queries: 1) I have gone through the modelling instructions given in the 'Stationary...
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