Modelling Pyroelectricity of PVDF
Hi all, I was wondering if anyone had undertaken a model to determine the pyroelectric output voltage of a PVDF film (or any other pyroelectrically active piezoelectric material) when exposed to a...
View Articleill conditioned preconditioner
I am trying to model the electromechanical response of a comb drive that is attached to a spring. However, every time that I try to simulate I get the following error: Failed to find a solution. In...
View Article3.5a AC/DC SPICE Netlist Import Error
Hello, I am currently attempting to import some SPICE Netlist code into COMSOL 3.5a. I am working on 3.5.0.603 if that helps. I am running into the error "Error: 5064 Invalid identifier for device...
View Article"Failed to compute elastoplastic strain variables" Help Please
Hello, I am an absolute beginner at COMSOL Multiphysics and I am trying to model the effect of the movement of soil on a steel pipeline buried in it. I have attached the model file with this post. I am...
View Articlecombine axial loads with torsion loading
I have a problems to do simulation about the combine loading above. I want to simulate analysis but the control of displacement for both type of loading. SO its possible to do so in comsol because i...
View ArticleCAD import preparation for successful modeling
In preparing CAD models for effective modeling, I have made the following I have found the following to be useful: 1) Importing to COMSOL as solids only 2) Ticking the three boxes for repair options in...
View ArticleRF Module: material dispersion for transient simulations
How do I simulate structures with dispersion using the transient solver in RF module? I am new at this, so any examples or step-by-step tutorials would greatly be appreciated.
View ArticleHow Can A Temperature Dependent Variable Changes Permanently?
Hello, I'm using COMSOL 4.3b for simulating a laser-material interaction, and I have predefined several parameters for specifying material's physical properties such as material's density, material's...
View ArticleFiber Bragg Grating simulation using COMSOL v3.4
Hello ppl, Im new here. Im doin thesis on Fiber Bragg Grating simulation. Can anyone help me on FBG issue that is it possible to design Fiber Bragg Grating using COMSOL v3.4? Let me know ASAP plz. Thanks.
View ArticleLaser heating of Sphere
I'm currently attempting to model a spherical object that is being heated by a laser. I have defined the laser using a gaussian pulse with the function for the heat flux being: plaser*gp1(x)*gp1(y)...
View Articlefix error
Hi I want to simulate "scatterer on substrate" from a pdf I downloaded from site. I did step by step from that toturial, but when I click "compute" it shows me the following error error in sweep: the...
View ArticlePipe Model for heat transfer (Conjugate heat transfer)
Dear All, I solving the conjugate heat transfer problem. The problem definition is: In a shell and tube configuration, the heat transfer fluid is flowing in tube with some velocity and shell side is...
View ArticleHeat distribution in a silocon beam due to LASER source of light
Hello everyone, I want to observe the heat distribution in a silicon beam when the LASER light is impinged perpendicularly to the surface of the rectangular beam. Can anybody help me in this...
View ArticleHow to delete unwanted stored solutions?
Hello, I am simulating large 3D RF problem in time domain in version3.5a. And I found my whole stored file is as large as 40GB, since I stored around 600 time steps. And I want to delete the last 100...
View ArticleAC/DC rmm module - bug report
In the 2D generator tutorial, I changed the prescribed rotational velocity from 'rpm' to 'rpm*tri1(t[1/s])'. tri is a triangle function. Therefore the rotation speed should first increase, then...
View ArticleMoving mesh - Particle moving through fluid
Fellow COMSOL enthusiasts, I am trying to get familiar with COMSOLs moving mesh feature, starting with a really simple example: a particle moving through fluid (e.g. Stokes flow around a sphere)....
View Articlejava.lang.ClassCastException when using LiveLink from MATLAB
Hi there, I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models. However, yesterday I ran the same MATLAB code as I always do, but...
View ArticleHelp me! Error"Internal error in boundary respecting."
Hi, all I want fix it, It is coordinate (-2,06378, 1,35209, 2,8034) Thank a lot Vinh Nguyen
View ArticleMaximum values over time in a 2D spatial domain
I am running transient simulations of solute transport in a 2D domain. I would like to find a 2D spatial profile of maximum value of solute concentration over simulation time, which may not occur at...
View ArticleRF Module Mode Analysis Study for 3D Metal Cylinder Waveguide
Hello Forum, Thanks in advance for reading and potentially responding with thoughts. I am trying to model a cylindrical metal waveguide, and in particular, I want to solve for the mode shapes. This is...
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