When I have to use 2d or 3d modeling?
Hi Everybody! I´m Wagner, from Brazil and I have a question, a simple question I think! How I decide if my modeling will be in 2d or in 3d? I have Heat Transfer and AC/DC model and I work calculating...
View ArticleVibration of a cantilever beam
Hi, I am trying to model a beam oscillating under external vibration condition. I have kept one end of the beam fixed. I have tried applying different kind of boundary conditions to solve the problem....
View ArticleElectromagnet modeling in 3D BH curve&relative permeability
Hi all, at start let me say I am new in Comsol. I am using v 4.0a AC/DC Magnetic Fields. What I am trying to model is type of a magnetic brake. It`s geometry is very similar to plain electromagnet,...
View Articlemode analysis for hollow core photonic crystal fiber
Hi, Is there anyone has experience doing mode analysis for the hollow core photoni crystal fiber? I tried to build the model but cannot find the confined mode although I am pretty sure the parameters I...
View Articlemaximum (or minimum) value in a time domain
Hi, I have a problem I cannot solve and you might help me. In my time-dependent analysis I would like to know the maximum of value of a variable, which has been reached at previous time steps. But I...
View ArticleJoule Heating with Thermal Expansion Simple Setup
Good Afternoon Everyone, I am new to COMSOL but have used other software for simulations (ANSYS), I am currently trying to model an aluminum wire embedded in a polyethylene substrate, just doing a 2D...
View ArticleCreat geometry
Hi everybody, I would like to know how to create a serpentine heat exchanger inside a block of material (2 D and 3D)? Thanks
View ArticleGenerate report with 4.1
I am wondering how to generate a detailed report like the one below in Comsol 4.1.resource.npl.co.uk/docs/scienc...symmetric/microdisk_report.pdf Couldn't find anything comparable in the documentation.
View ArticleCreate geometry from a matrix
Hi everyone, I am trying to create a geometry with Comsol 4.3 with Matlab 2012. The geometry I want to create is very complex. The geometry is defined by a matrix (the value 1 corresponding to the...
View Articledoes a periodic boundary condition for u implement inflow u (boundary1) =...
Dear everyone, I have a question about the implementation of periodic boundary conditions for fluxes, so that the inflow through one boundary equals the outflow through the other. In comsol 3.5, this...
View ArticleSpecifying a rotating boundary condition
I would like to simulate a rotating wall condition. For simplicity, imagine a square box. On the top surface of that box there is a circle. Inside of the box is a viscous fluid. I would like to impose...
View ArticleFrequency sweep in a magnetic field interface
Hello everyone, This should be seemingly siomple problem. I am trying to model the AC magnetic field due to a coil in 3D. I am using a magnetic field interface on a simple cylinder (acting as the coil)...
View ArticleFailed to evaluate variable Jacobian
Hi I simulate the rib waveguide with the sio2 substrate and material of the core Er:Ta2o5 i define the lambda=1550nm in global definition>parameters, and in the step 1:frequency...
View ArticleHigh current output
Hi everyone, I am simulating a heat treatment with the induction heating module and I'm facing a problem concerning the single turn coil. More specific I import as a coil excitation the a power of...
View Articleelectromagntic propagation through three layers
hello I am student on electronic and I am trying to simulate with comsol on rf module , in summarize my work is to simulate the sun light propagation through three layers bonded to each other and I had...
View Articlemf and mef huge difference
Hi, I want to compare mf and mef physics in order to know which one I have to use for my study. I work with a coil and a conductive core. I'm interesting in the electromagnetic power dissipated in...
View ArticleCoplanar Grid Detector Capacitance
Hi all, I'm fairly new to Comsol and I'm trying to obtain the capacitance for a CdZnTe coplanar grid detector (CPG). I've read up on how the the parallel plate capacitor is built up and tried it out...
View ArticleCannot pass results from EMW study to Stationary Study - Bug or Mistake?
Dear Users, I am having a problem with passing results from the first study to the second study of my model. I am simulating a PIN solar cell and the simulation is divided into two parts: - Study 1 –...
View ArticleWhat is the exact electric field expression when using the PORTs? -...
Dear all, In the attached 2D model, I use 'Electromagnetic Waves frequency domain' and I would like to study the light propagation inside my structure. I would like to have a input power flow at port 1...
View ArticleVariable exchange between Matlab and Comsol
Hello everyone, I am running Comsol using the LiveLink with Matlab and am trying to do the following: I have a value, dt, which is 0 everywhere in the beginning. (I can either use dt=0, make an...
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