how to simulate a permanent magnet with vertical movement toward a coil ?
Hello everybody, i want to simulate a permanent magnet with vertical movement toward a coil i've used magnetostatics and moving mesh in comsol 3.5 i defined a constant Br(remanent flux) and a...
View ArticleBC in assembly mode
hello, idk but i am getting an error in running the simulation. I am getting a warning saying: "MUMPS allocation factor increased to 1.44". What does it mean? is it due to the insufficient BC? I am...
View ArticleDifficulties with #985 Peristaltic Pump Model
Hi All (bear with me; I'm new) Working my way through the peristaltic pump tutorial and all has been a-okay thus far but once I get to the plot of the total volume (bottom of pg. 14) when I try to...
View ArticleHow to see the plots after running in batch mode?
Hello! I managed to get comsol to run in batch mode (Linux). However, after I open my newly created output model file out.mph, I do not see any graphs available. I am solely interested in CFD module,...
View Articleparticle deformation througn a contrained channel
Hi there, I am doing COMSOL simulation to see the behavior of a particle flow through a microchannel. There is a area of the channel where particle size is greater than the cross section. So the...
View ArticleExternal U vs. I
Hello, I'm quite new to COMSOL. I generally have doubts where to use external U vs. I or external I vs. U when I want to insert my designed model into a circuit. I think in any of those cases I have to...
View Articlehill plasticity
Hi, Trying to make hill plasticity non-symmetric so my question is; is it possible with different yield stress level in tension and compression. Then in addition the plastic stage is confusion. How are...
View ArticleMesh 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 Article