Clik here to view.
Counting particles by inlet; Particle tracing in laminar flow
Hello Comsol community! I'm simulating a simple 4-way intersection using the laminar flow module. Two streets are inflows and two are outflows. Thereafter I'm adding particles to each input flow with...
View ArticleClik here to view.
How to integrate heat pipes in a cylinder
hello I am beginner with Comsol (Version 5.2) and I need to modelize a geothermal tunnel.The principe is to integrate pipes (serpentine) into the tunnel's walls (whith cylindric geometry) to absorbe...
View ArticleClik here to view.
How to obtain a variable(x,y,t) with Matlab
For a variable, say pressure p, is a function of x,y,t. In Matlab, we usually have p(x,y) for pressure at any point we want to know. However, in Comsol linked with Matlab, how can I obtain pressure at...
View ArticleClik here to view.
Server localhost
Hello, I have got a license for comsol v5.2 (trail version for 2 weeks) Failed to connect to server. No connection could be made because the targer machine actviely refuse it. Can anyone suggest what I...
View ArticleClik here to view.
About calculation of the electron trajectory in magnetic lens(2D Axial Symmetry)
Hello, I am a beginner of COMSOL. I want to calculate the electron trajectory in magnetic lens(2D Axial Symmetry). I can calculate the magnetic flux density. Then I try to calculate the trajectory by...
View ArticleClik here to view.
How to get the polarization state of the reflected light?
Dear all, I have been working on the magneto-optical effect. A linearly polarized light is reflected by a magnetized film, Cobalt film for example. The reflected light is supposed to be ellipcitally...
View ArticleClik here to view.
Moment diagram along a 3D beam
Hi, I am new to COMSOL and having problem with extracting moment diagram from a 3D cantilever beam under various loads. I have applied loads and moments at the free end of the beam and defined the...
View ArticleClik here to view.
How can I modify equations of a built-in physics model ?
Hello, I am working on a piezoelectric device and I would like COMSOL to take into account the electrostrictive effect. I know that it's possible to build your own physics but here I just need to add a...
View ArticleClik here to view.
Integrate an Isosurface
Hello, I am wondering if there is any way to find the area of an isosurface, or integrate a function over such a surface. For example, if I am working with electrostatics, is there a way to check the...
View ArticleClik here to view.
Boundary conditions for electromagnetic waves
Dear comminity, Can you help me with the following: What should be the boundary conditions if my wave changes its polarisation during the propagation from linear to elyptically - polarised? I suppose...
View ArticleClik here to view.
Relative tolerance vs Relative Error
Hi all, having read many relevant threads and also searched in the comsol manual , i still dont understand the difference (if there is indeed some) between relative error and relative tolerance. for...
View ArticleClik here to view.
Time-Dependent initial solution violates specified initial conditions
I am trying to build a dye-washout model (using Reacting Flow in Porous Media physics to predict the time-dependent concentration of a dilute species). I'm able to run simulations for varying lengths...
View ArticleClik here to view.
Problem on result when simulate varied force between two permmanent magnet...
Hi, Currently, I am working on a 3D model of two permanent magnet plates (I have attached model below, the permanent magnet plates have alternating polarity). One permanent magnet plate can move in the...
View ArticleClik here to view.
How to plot time-dependent temperature profile at a point
Hi all, I have 1 question over here, i have been using the SAR head tutorial (Provided by comsol tutorial) to do research for my school project and i have 1 problem over here which is, i cant seems to...
View ArticleClik here to view.
Time dependent Temperature
Hi all, I am solving a time-dependent heat and mass transfer problem. When I solve it for time (0,10,1800), I am getting the expected results but when I change the time to (0,10,2500), the temperature...
View ArticleClik here to view.
Ray phase in ray tracing
Hello, I'm trying to measure the phase of a bundle of rays that are reflected from an aspherical surface. File 1 attached is the ray tracing and the red plane in file 2 is the surface on which I want...
View ArticleClik here to view.
Error increases with mesh density for trivial 1D model
Having had some problems, I reduced them down to a surprisingly minimal example: • 1D, single interval, Laplace equation. • Dirichlet BC on left end: fix it at "1.0". • (There is a zero-flux BC on the...
View ArticleClik here to view.
Problem with convergence of solution in 2D U shape Thermal Stress
I want to know how much deflection at some point in my structure in "Thermal Stress" module So from the beginning, I chose 2D Structure Mechanics - Thermal stress, and stationary as physics. I defined...
View ArticleClik here to view.
How to compute the derivative of magnetic field?
Hello everyone. I am learning "scattering nanosphere", a model in the library of wave optics module. I try to acquire the derivative of magnetic field, e.g. , d(ewfd.By, z). The result is zero...
View ArticleClik here to view.
Time Dependent Study
Hello everybody, There's something about the time dependent studies in COMSOL that I'm not able to understand and I would like you to help me if possible. I am solving a heat transfer problem and, to...
View Article