Eigenfrequency shift due to thermal expansion
Hi, I'm new to Comsol and the Comsol I'm using is 4.3. I would like to study the eigenfrequency shift of a solid cylinder over the time when an infrared laser is heating one of its surface. The heating...
View Articleuse time dependent parameter in a funciton
Hi all, I'm trying to generate a simple electric pulse with Function from Comsol (global definition->function->rectangle). We can assume the rising edge and falling edge of the pulse are perfect....
View ArticleInitial condition drift when sequencing COMSOL through Matlab
Hello, I’ll start with my question and then explain the problem which gave rise to it. Is there a way to insure that the initial temperature condition in a transient heat transfer problem is the same...
View ArticleConvergence plots
Does anyone know if it is possible to show a convergence plot during a livelink with Matlab? I'm using version 4.4 and matlab R2013a. Thanks
View ArticleModelling IQE in nanowires with surface depletion
Hi I'm completely new to COMSOL and want to see how band bending and recombination vary with doping and optical excitation in semiconductor nanowires. I'm trying to define a continuous surface trap...
View ArticleCurrent Injection and Potential Difference measurements
Hi I'm working on ERT sensitivity and i want to be able to perform current injection to an electrode and measure the potential difference on the other electrode, while the other electrodes are...
View ArticleInductor Design
Hello guys, This is my first time using comsol so the question I am asking might be silly for you. Please bear with me. I have built the 3D model of two phase inductor with the reference of example in...
View ArticleHow to simulate material removal?
I am trying to simulate material removal in Comsol. My aim is that I want the material removal in the material after the temperature goes beyond its melting temperature. I have been trying to change...
View ArticleHelp with simulating condensation from a partially filled closed glass vial...
Hi! I am having trouble with a condensation simulation. A closed glass vial at ambient temp is partially filled with 10 degC water. When it is put in a cold room with temp of 5degC, condensation...
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Coupling problem: Nernst-Planck equation with Poisson not converging
Hi, I am unsuccessfully trying to implement to Poisson equation through the Electrostatic Module into the Module "Transport of Diluted species" for a stationary case. Beside those modules I use the...
View Articleminimum time step
Hi all, I am stuck at trying to choose correct solver options/properties for my model. I am working on H-formulation in Time-dependent case. I cannot find an option where I can set minimum time step...
View Articlegradient of a surface property along the surface
Hi, I wonder if I can calculate the gradient of a surface property (curvature, surface energy, surface charge, etc.) along the surface? (d(curvature)/ds) both 2D and 3D... Note: I know that d(phi)/ds =...
View ArticleDeformed geometry at each time-step, if a condition is observed
Hi, I am trying to model the growth of an oxide scale with COMSOL4.4. I have an element B diffusing in the system and consumed at a boundary x=Xi (the pb is in 1D). I want to built a deformed geometry,...
View ArticleModelling edge cracks
Hi, I am new to Comsol. I am trying to model stress intensity factors around a crack. All the variables I have set up thus far works, such as strain energy density, traction vectors and the so called...
View ArticleJava NullPointerException Error
Hello, I'm running a Comsol model through Matlab that consists of 10 user-defined PDEs. The process I model is cyclic, and has four steps per cycle. Each step has different boundary conditions, but the...
View ArticleHeat Transfer issue in a phase change environment - 1D example
Dear COMSOLers, we are facing the following issue with the Heat Transfer Module. We are carrying out a simulation campaign in order to evaluate the temperature pattern and thermal behavior of a...
View ArticleFind the start time of an event
Hi all, I am working on a model in which hot liquid from a source flows on an free surface and cools over time. I need to find the time when the fluid temperature drops to a certain point. And the...
View ArticleFSI-Acoustic Radiation Analysis
Hi everyone, I am working on a simulation that analyzes the effects of an ultrasonic wave (50 MHz) on structures within the vestibular system. I am using the FSI physics instead of the ASI physics...
View ArticleSolving heat equation, error:6194 "Attempt to evaluate non-integral power of...
I am trying to solve heat equation with a coupled system, Poisson's equation, convection and diffusion and heat equation. When I try to solve the heat equation to obtain N I am getting this error,...
View ArticleComparing two geometries using components
Hello, I have two models using Joule heating, which seem to work well enough to give me the qualitative analysis I need. For my own convenience and to keep things neat, I thought it might be nice to...
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