Clik here to view.
3D plotting normal displacement on surfaces
When doing a 3-D plot, I want to illustrate how a c-library function I wrote, designed to generate rough surfaces via the Deformed Geometry (dg) module. I want to plot contours of the normal component...
View ArticleClik here to view.
Facing problem in selecting perfect electric conductor boundaries
Hi I am trying to design multi mode interference coupler in 3D and I used electromagnetic beam envelope as physics. There in perfect electric conductor option I want to select some boundaries but not...
View ArticleClik here to view.
An empty cavity was created
I am doing cfd analysis in a filter considering laminar flow .During mesh process with coarse the meshing was successfully but when changed to normal or coarse i am getting error as ''An empty cavity...
View ArticleClik here to view.
Force between a permanent magnet and magnetic field
I want to calculate the force between a permanent magnetic material and a magnetic field created by electromagnet. Can anyone help me with the required steps in COMSOL 4.4? Kindly do the needful....
View ArticleClik here to view.
determination of initial gap between contact tips
Hi, I encountered a contact problem. The upper geometry is solid domain and the lower component is also solid domain, otherwise the intermediate component is fluid domain. The assembly of this geometry...
View ArticleClik here to view.
Application Builder, Newbie help, using For loop
Hi I have just started out using the API for the first time and I wish to generate a number of Global Parameters entries, namely sigma_ink1, sigma_ink2, sigma_ink3 etc. I have successfully recorded a...
View ArticleClik here to view.
Update/compute solution
Hi, I am wondering when it is appropriate to use the update solution button rather than the compute solution button. If I change only the mesh will I need to compute the solution again from scratch? If...
View ArticleClik here to view.
Polarization curve in battery module
This is the most basic question and I think here is where I should start. I am trying to simulate a 2D flow battery module and am applying the primary current distribution physics to it. I have...
View ArticleClik here to view.
Use the results of a study as model input in another study.
Hello! I am trying simulate how the thermal state of a bubbling fluid evolves over time. To do so I am trying to run a stationary simulation using Comsol's Turbulent Bubbly Flow module and then use the...
View ArticleClik here to view.
Topography
Hi, Is it possible to import topography data to COMSOL and simulate (draw) a landscape? Thanks
View ArticleClik here to view.
Difference between surface average and surface integral
Hi all What is the difference between surface average and surface integral ?. Are they same or different? Thank you
View ArticleClik here to view.
Simulating FET in Semiconductor Module
Hi, I am trying to simulate a FET device in 3D (not Silicon) in the Semiconductor module. 2D model is working fine. But when i try to vary the W/L ratio, the solution does not converge. Is there any...
View ArticleClik here to view.
Modelling magnetic field between 2 cylindrical bar magnets
Hi, I'm trying to model the magnetic field generated by two permanent bar magnets (Neodymium magnets) but when I plot my data increasing the size of my air domain significantly changes the plots. I...
View ArticleClik here to view.
About how to calculate the S-parameters on certain port using line...
Hello, I am doing simulations with RF module. It is about the plasmonic resonance in MIM structures. Actually I would like to use more than one active input ports in my structure. However, when using...
View ArticleClik here to view.
Solvers in COMSOL
Hello everyone! I am a newbie who seeks help in COMSOL. I have simulated a laminar flow in an annulus using direct solvers. The results match well with the problem (taken from Bird Stewart Lightfoot)....
View ArticleClik here to view.
How to export the slice image from 3D ?
hello, I am building a 'human head' model, in the 'electrostatics' division of the 'AC/DC module'. I create a plot slice of my model. I need to export that plot slice to JPG or JPEG or PNG. How do i do?
View ArticleClik here to view.
rolling sliding contact
Hi, I would like to create a model in time dependent study. My model include a cantilever beam and a ball with no contact in initial moment. A ball located in the tip of the beam, it was applied a...
View ArticleClik here to view.
Negative Concentrations
Hello, How to avoid negative concentrations? Can anyone please help me? dCA/dt = -CA1*ko*exp(-E/R/T) I used the following constraint on concentration. CA1=if(CA<0,0[mol/m^3],CA) But it returns the...
View ArticleClik here to view.
How to make animation in control
I want to simulate the wave propagating in plate, but the animation show the stress deformation is out of the border of material, as i show in attachment. what's the reason?
View ArticleClik here to view.
Syntax to invoke solutions at a specific frequency in the frequency domain...
Hi all, in short: When multiple frequencies are solved for in the frequency domain, what is the syntax to invoke the solution at a specific frequency? In detail: I am modelling a nonlinear optical...
View Article