Adding physical parameters
Hi I have question,please help me I want to add some physical parameters to my waveguides,how can i do this? both of them is: parameter: signal absorption cross section at 1527nm (σ12) value:4.8*10e-21...
View ArticleUsing interpolation to define temperature-dependent material properties
Hi, I am a COMSOL beginner. Trying to added a file containing temperatures and measured material properties and then utilize an interpolation function to define the temperature-dependent material...
View Articlechoosing modes in pcf
Hi everybody ! I am using COMSOL 4.3.151. I am trying to get the norm of electric field for the LP11 mode.But I do not know for what value of effective index I will get that.I am already getting the...
View ArticleWhen we using meshing?
Hi please help me I started define a waveguide with this software,and i have a question: when we using meshing? friends please help me thanks
View ArticleHeat transfer
hi, i need to calculate thermal conductivity for various volume fraction of ALN with PMMA. In that paper they mentioned about When the sample is given a heat power,the direction of heat transfer is...
View ArticleHow to get current from current source
Hi. I've build a model consisting of 4 electrodes, soil and air. The two outer electrodes are assigned with current source. One with a positive magnitude and the other with a negative sign at the same...
View ArticleConvergence problems with non-newtonian power law fluid
Hi, I'm modeling fluid flow through a microfluidic bifurcating network. Among other things, I am calculating the volumetric flow rate for a given applied pressure and comparing it to experiment. The...
View ArticleReading Deformation graph
I am getting a coloured graph for deformation in microgripper. Now I want to get the values of deformation at different point(x,y,z) (instead of graph) please let me know how to get that in comsol.
View ArticleUsing PDE to model 3D Maxwell equations for wavelength generation
Hi everyone I want to use PDE to model 3D Maxwell equations for wavelength generation by simulating the ultrafast laser beam interacting with gasous material in a gas cell. The equations in cylindrical...
View ArticleSector symmetry on a 1/5 3D electro motor
Hi All, i have a 3D model that shows only 1/5 of whole motor. It has 3 phase and 5 pool pairs. i'm using rotary machinery modul 3D. if i disabled all continuity BC on the outer slice surface, it...
View Articleflow boundary conditions: periodic velocity fall and normal velocity zero
Hello, I am attempting to simulate a 2D flow of a suspension of solid disks on a square lattice. To reduce the computational expense of this simulation, I'd like to consider shear on a single disk at...
View Articletime dependent coupled thermal structural with slow & fast pressure & thermal...
I ran a time dependent coupled thermal-structural problem with temperature dependent structural and thermal properties. When the thermal and pressure pulses were ramped up over two seconds no problem....
View ArticleCompatibilty
I am using COMSOL 4.1 RF Module. When I try to open a file older than version 3.5 I got error message. Is there a way to open those files? I think I should be able to open them since the later versions...
View ArticleProblems generating lamb waves in an Aluminum plate
Hi, I am trying to generate lamb waves in an Aluminum Plate using a Piezoelectric actuator placed in the center of the plate. I am pretty sure that the physics involved are solid mechanics and...
View ArticleThin Film BAW Composite Resonator simulation in COMOSL 3.5a
I'm currently engaged in the simulation of FBAR device in COMSOL 3.5a, and want to use this model. However, "in the model library", I find that the admittance of electrode is defined as...
View ArticleTransmission spectrum for optical waveguide
Hello, I am currently trying to extract a transmission spectrum from a Si waveguide on top of SiO2 substrate. There are some gold particles on top of the Si (this configuration is taken from an article...
View ArticleHow to set different thermal conductivity in different direction?
I am trying to simulate a heat transfer model which includes layers with different thermal conductivity in X-Y direction and Z direction. Is it possible to assign a user defined material and have...
View Articlesinusoidal function
Dear all I have to use a sinusoidal function [e,g X0+(X1*(cos*(w*t)))]. Where and how can I write it? rgds Anup
View ArticleNegative port impedance
Hi All, I am currently doing some antenna modeling. The antenna is excited by a 50 Ohm coaxial port. I get reasonable S11 results at resonance but the lumped port impedance is negative e.g. -5 Ohms....
View Articlehow to create polar plot in journal bearing
hello, need some help from u all to plot these polar plot. these study about pressure distribution around bearing surface of hydrodynamic journal bearing.. radius bearing : 50mm height bearing : 50mm...
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