What Physics I need for a liquid cooling problem with phase change
Dear everyone, I am totally new to COMSOL. Now I am working on simulation of a cooling system. It is a melted material thrown to another liquid (e.g. water). This may cause phase change of water from...
View ArticleEjection step in injection molding
Hi, I am trying to simulating the ejection step of injection molding process using Comsol. After filling plastic into mold cavity, and packing stage, the solidified plastic part is ejected out of mold....
View Articlestudy computation
hi, suppose if i use 3 different studies for three physics in my model do i need to compute each study one by one or 3rd one directly..
View ArticleFEM error
Hello every one. i am new to this COMSOL and with the help some tutorial i learned how to use. i am much familiour with Matlab. i want to ask 1 question, which i am facing in my most of the models. let...
View ArticleModifying the Fluid Flow Equation System
Hi everybody, Is it possible to change the fluid flow equation system in order to fit a logarithmic function in the derivative? I am currently using the earth science module to model a dual porosity...
View Articleheat source setting
HI;I have a question that when I using heat transfer in solid and lamina flow model to simulate heating a crucible in a silicon furnace, when I setting the heat souce desity equal:6000W/m^3, the...
View ArticleIndetity pairs should be fixed?
hello I am running a static structural mechanics problem on comsol multiphysics 3.5 . I have a building and i want to see the effect of a seismic load on my structure .. My problem is that the building...
View ArticleHelp solving nonlinear 1D diffusion equation
Hi All, I need to solve the following 1D diffusion equation on domain x=[0,0.4] between time t=[0,2]: w(u) du/dt = d^2u/dx^2 where w(u) = 1+184/u*(-1/log(u))^(4/3) subject to the initial condition...
View ArticleHeat Source Expanding with time!
I have a model for EDM process in which I need to put an heat source which would be expanding with time. But it shows error if I give time dependent position of a point under boundary conditions. Laser...
View Articlescript for exporting deformed geom from livlink matlab ?
Hi all, In GUI, I could remesh the deformed configuration from the results dataset, and from there i could export to a new geometry (xx.mphbin). But how can i do the same from matlab livelink ? I...
View ArticleMEMS Microcantilever with electrostatic actuation
Hi I'm new to Comsol and would like to model a mems electrostatic switch. For this I am referring to this example:www.comsol.com/showroom/gallery/444/ I was trying to understand the 3d model provided...
View Articlewidth of PML
What will be the width of the PML( circular) to determine the confinement loss in hexagonal pcf. Regards Md. Samiul Habib
View ArticlePCF, PML
Hi, I am designing a PCF with hexagonal pattern having five air hole rings. pitch = 1 um. air filling fraction = 0.90 i have used circular PML to get the imaginary part of refractive index. what should...
View ArticleMetal film with subwavelength size hole: Transmmittance and reflectance study
Hi I'm novice in comsol RF simulation. I'm trying to simulate transmittace and reflectance throught metal film with subwavelength size hole. My structure will consists of Air/metal/semiconductor...
View ArticleHeat Transfer Problem
Hi everyone, I found my heat transfer problem is taking too long to solve even in stationary. The problem is about a pair of thin pipes embedded in soil. pipe diameter 25mm, 20m long each. There is...
View Article"Error: Duplicate variable name."
I am using solid mechanics, electrostatics and moving mesh and I want to perform an Eigenfrequency Study. The solver crashes with an error message:"Error: Duplicate variable name." But I didn't find...
View ArticleHow to pass result from one module in to another module.
HI All I am working in two modules, Structural mechanics and Electrostatics. I want to pass the result of the Structural mechanics module as input in to the Electrostatic module. For example: I want to...
View ArticleHeat Transfer in Solid combined with HT Fluid: Problems
Hi dear members, Please I am working on a heat transfer case where I have to show the heat transfer in the fluid and on the mateial. the first one in fluid is done, but the latter on the solid is...
View ArticleFinding Harmonics of an IDT SAW device
Hello, I have a two-port SAW device and I would like to plot scattering parameters (mainly S12) in a frequency dependent fashion. I was having trouble integrating the RF module, so I initially tried...
View ArticleCalculating contact area
Is there any way to calculate the contact area of a contact pair within COMSOL (ie without having to post-process data in MATLAB, which I have yet to try)? I have tried surface integration and other...
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