Quantcast
Channel: Latest Discussions - COMSOL Forums
Browsing all 26512 articles
Browse latest View live
↧

Communication between Comsol and Matlab

Hello Forum, I encounter a problem when I try to use a Matlab function within Comsol. I can plot the function in Comsol. But when I try to run the study, I receive the error attached: "Failure loading...

View Article


Water balloon deformation

Hello, I've only recently started using this program, so my level of knowledge is not very high. I'm trying to model the physical deformation of a water balloon due to external force (get the shape in...

View Article


current in 1D element

Hello everybody, I have a network of 1D elements and I have modeled the current flow inside them using Coefficient from edge PDE. So after running the model I have the voltage in all the structure as...

View Article

How to calculate the transmission

Dear all, I have a question about how to calculate the trasmission through the nanostructure. For example, in the "Optical Scattering Off of a Gold Nanosphere" tutorial, we tell comsol to solve for...

View Article

Problem in Meshing

Dear Sir/Madam, We are using a cORROSION module based on a complex imported geometry (steel cage in ac oncrete with five surface boundaries).After following the sequence of steps to simulate an OIL...

View Article


imported model creates extra domain

Hi, I have a simple 3D model that I've exported from Solidworks as a Parasolid x_t file and the pulled the Parasolid file into COMSOL. I am having a meshing issue which I have tracked down to a "ghost"...

View Article

Photonics Crystal Fiber

Hi, can anyone send me an example of solid core PCF? because ive got trouble on how to do this, especially to get the S-Parameter study.. is it necessary to run in 3D simulation? thanks :)

View Article

Adaptive mesh refinement within a parametric sweep

I am trying to solve a fluid flow problem over a range of inlet flows using a parametric sweep. The solution does not converge at higher flows, so what I would like to do is run the sweep until it...

View Article


Vibrationg structure in fluid

Hello Everyone, This is my first project with Comsol so I have no clue about what I am doing really. My questions are most likely very simple/stupid I'm sure anyone here can help me. What I want to do...

View Article


power outflow, time average mwp.nPoav

Hello, using a 2D-axial symetric model in rf-module (plasma), on my coaxial power input port I put 50 W.. inner diameter 8mm, outside 50mm (21 mm radial distance). how does mwp.nPoav come on -800 W/m ?...

View Article

Plot templates?

Hello, what is the trick to manage all the results coming from different sets of parameters? i run each set into a new mph file. trouble is, when i improve one of the models, i need to correct all of...

View Article

how can I get the correct volume value and the body resistance!

In joule heating model of 3D with comsol 4.3, using the measure tool, I can't get the volume value, only displaying as follows "Domains: 1. Faces: 8. Edges: 12. Points: 6. CAD objects: 1.", How can i...

View Article

Singular matrix error

Hi, I am new to Comsol. I have been trying to simulate flow over NACA4412 airfoil. I have been using circular domain. My boundary conditions are 1. no slip on the airfoil surfaces 2. inlet velocity -...

View Article


plate capacitor in frequency domain emf

Hi, I built a model of a simple two plate capacitor and I want to compute the capacitance in frequency domain with the emf interface. I built two plates, set the material to copper, created a...

View Article

Two-phase flow including both incompressible and compressible fluids

Hello! I've been struggling to construct a Comsol model that simulates two-phase flow, in which one fluid is water(incompressible), the other is air(compressible), which can reach Mach number of around...

View Article


Unexpected error

Hi every body, I am using Comsol 4.2a. I would like to modify material constants but when I try to do it appears "An unexpected error as occurred". I try to make a new file with only one rectangle and...

View Article

NaN values for particle tracing using brownian motion

Hi, I was wondering if anyone had experienced this problem and/or knows of a fix: I have a very simple model involving 3D steady-state laminar flow through a rectangular channel with symmetry sidewall...

View Article


Derivative of Interpolation Functions

Dear all, I am trying to understand if, given an interpolation function (defined by a table of points in an external file like *.txt file) it is possible to define the derivative (spatial) of the...

View Article

integrating a lookup table for frequency dependent variables

Hi everyone, I have created a lookup table for frequency dependent values of epsilon_r. This table includes two interpolation functions: one for the real part (eps_real) and the other for the imaginary...

View Article

Temperature effect in Electrostatic module.

Hi, I am using Comsol ver 3.5a. Can anyone guide me that how could i observe the effect of temperature on capacitance value in Electrostatic module ? From where i can change/control the temperature in...

View Article
Browsing all 26512 articles
Browse latest View live