Clik here to view.
Modeling Fsi physics with viscoelastic material and low-Re-K-epsilon...
I am trying to model fsi physics. For fluid part, "low-Re K-epsilon" turbulence model is proper in this case and for solid mechanic part linear viscoelastic model must be chosen. unfortunately, I...
View ArticleClik here to view.
Non-Newtonian models in COMSOL
HI, I am re-posting this as I didn't receive a lot of attention last time. I have only seen Carreau and PowerLaw models for non-Newtonian flows in COMSOL. However, I want to implement a different...
View ArticleClik here to view.
Magnetic Flux Function
Hello, I'm working with the magnetic fields, no currents module to create an axially symmetric model. I'm verifying past work done by a colleague. He used another program to plot the flux function of...
View ArticleClik here to view.
A contact model with exceptional force related to the distance
Hello, everyone. I'm a new user of COMSOL. I want to bulid a contact model with Structural Mechanics Module that the hemisphere contacts a flat plane. The contact pair is used between the spherical...
View ArticleClik here to view.
Cut point 3D
Hi, Simple question: my model is 3D, and I defined 5 points inside the results-Data Sets sections in order to evaluate them. But how can I be sure that the points that I defined are located inside my...
View ArticleClik here to view.
Prestressed piezoelectric analysis in frequency domain
Hi everyone, I'm trying to simulate the prestress effect on the resonance frequency of a piezoelectric material using the "piezoelectric devices" physics. I'm trying to do it in two steps : 1. Apply...
View ArticleClik here to view.
geometry optic (GO)
hi how can i find Ray intensity in GO(geometrical optic module) for example along a line ? thanks
View ArticleClik here to view.
A problem in electromagnetics.it seems to ba a bug of COMSOL
As we all know, if there is a current in conductor, there will be a static magnetic field around it.If i simulate it using a 3D numerical model， i can get the static magnetic field. However, when i...
View ArticleClik here to view.
Exciting a meta-surface with a point source
Hi there, I'm completely new to COMSOL, so I still struggle with it a lot. Bear with me! I've already looked in the existing discussions but found nothing helpful. What I want to do is model the power...
View ArticleClik here to view.
Modeling graphene to use Electromagnetic Wave
Hi, I want simulate a nano dipole of graphene. I tried to simulate use "wave equation" and put the electrical condutivity of graphene there, but it's not working! I need help, please! Thanks!
View ArticleClik here to view.
NaN or Inf found when solving linear system using SOR in RF Module
Hi everyone, I am trying to simulate S parameters of a coplanar waveguide resonator between two lumped ports in RF Module, where frequency domain study is chosen. However, when I run the computation,...
View ArticleClik here to view.
Electrochemistry
Hello, I am new in Comsol. I want to model a channel flow cell with hydrodynamic condition that I am using in cyclic voltammetry . And flow rate assumed to be variable here. I wanted to know if anyone...
View ArticleClik here to view.
heat source with time and temperature coupled load
I have a battery with many cells in it, these are relatively sensitive to temperature. that is, 250 ° C, there is a sudden internal heat generation lasts about 30 seconds. I am now interested in the...
View ArticleClik here to view.
Arrow surface in 2D model (Transport of diluted species) and value of flux...
Dear Community, I built a 2D model with the transport of diluted species physics. I would really appreciate some help with reviewing the results. I want to plot the species flux (total flux/diffusion...
View ArticleClik here to view.
Solid Mechanics, Cantilever Displacement Constraints
Hi I am trying to control the free end of a 2D cantilever problem whereby the end slope is not allowed to change but where axial displacement can take place ...classical plane sections remain plane...
View ArticleClik here to view.
Solving drift-diffusion and current continuity simultaneously
Hallo comsol forum !!! I am new to comsol and I would appreciate any of your help! I am trying to solve this drift-diffusion equation d(nd)/dt = div(D*grad(nd) - v*nd) + G (G is the generation rate),...
View ArticleClik here to view.
how to get a total mass of a component in a reactor vessel.
Hi all, Very new to the field as my time as a researcher has been in biology. I am modeling a bioreactor I designed as a 2D axial symmetry model. The cell mass is calculated as a density (kg/m^3) but i...
View ArticleClik here to view.
Clik here to view.
integration over parameter instead of geometry
Dear all, I was wondering if the following integral was possible in Comsol. where f(g) is a known function, a,b are the limits (also known) and emw.Ex would be the electric field which depends on the...
View ArticleClik here to view.
Strange boundary artifacts for two phase level set model
I built a model to investigate the case that viscous fluid from a pipe deforms on a horizontal surface. In the 2D axisymmetric model modified from the level set nozzle inkjet model, viscous fluid from...
View Article