One way multiphysics coupling within a transient simulation
Hello Fellow Users, I am solving two physics (fluid flow & species transport) in a transient simulation. The fluid flow is not affected by the concentration distribution. As of now, i have...
View ArticleDiamond Young's Modolus Property confusion
Hi Comsol Community, the Young's modulus property of diamond in the Comsol material library is 105 x 10^9 Pascal whereas the proper property value in literature is an order of magnitude larger: 1220 x...
View ArticleHow to implement Valveless Piezoelectric Micropump
hello everyone. Is there any way to have a hold on the model presented in this paper for a piezoelectric micropump?"Design and Simulation of Valveless Piezoelectric Micropump" I have difficulty linking...
View ArticleMaterial properties in axialsymmetric form for 2D axialsymmetric simulations
I have the following problem: I'd like to perform a 2 dimensional axialsymmetric simulation of a piezoelectric thin film on a silicon bulk and a round metal electrode on top. Since the coordinate...
View ArticleIssue with temperature distribution
I am using COMSOL for simulating heat generated by current through a metal bar for my 3rd year dissertation project. I am having an issue with the output following the simulation. I have applied a...
View ArticleInterpretation of results
Hi, what is the difference between "Line Integration", "Line Maximum/Minimum" and "Line Average" under subnode "Derived Values"? What is calculated specifically? How to interpret the results? For...
View Articleparametrize the position of a point in the geometry gives an error message
Dear Comsolfriends, I want to do a parameter study for the size of my geometry, but I get the following error when trying to set the position of a POINT using a parameter defined before in MATLAB...
View Articlesave the mesh points into a text file
How can I save the mesh points into a text file or some similar? Thanks!
View ArticleIssue importing ipt files from Inventor with the CAD module
Hi, I can't seem to import a simple IPT cad file (that has a helix built in) from inventor, the import module gives me an error back saying: Not a valid ENTITY type for this operation - Detail:...
View ArticleScattering boundary conditons for non-normal incident
Hi all, I'm wondering, if it possible to use the scattering boundary conditions in the RF module to make a boundary transparent for a plane wave with a known wave-vector (which is different from the...
View Article"Undefined value found" Error when simulating EM-Wave on imported 3D Pyramid
Hey all, I am trying to simulate the E-Field enhancements on a micro-pyramid structure for which I imported a pyramid with rounded corners from AutoCAD as a .sat file. I set up everything the way I...
View ArticlePML does not work during wavelength sweep
I was simulating the scattering from a nanodisk by normal incidence. With a spherical PML, the scattering field should be basically symmetric below and above the disk plane. It is indeed so when I...
View ArticleStore solution and use as a boundary condition for the next run
Hi Does anybody knows how to apply the results obtained at the outlet of first run back to the inlet as an inlet bounrady condition? Actually the objective is to study a flow in a long clyinder by...
View ArticleProblem related to imported mesh file
I was trying to import a mesh flle (mphtxt) file from Simpleware Scan FE software. However when I import this mesh file in COMSOL and throw all the physics on it, following error appear : Can you...
View ArticleFuel tank simulation
Hi, I have a project about fuel tank simulation. The thing that I try is similar to the sloshing tank example. However, since the fuel tanks are closed [ :) ] I need to limit the deforming mesh. Has...
View Articlespecifying varing coefficient - interpolation function
Hi all, I would like to specify varing htc via interpolation function and apply it to a heat flux boundary condition. I am attaching a sample file. - Model: 2D-axisymetric (i.e.cylinder, mm), heat...
View ArticleHow to use user defined functions as physics's input? Thanks!
Hello, every one! I am learnging to use COMSOL4.2 and want to add AC signal as my device's input. Just as Eric told me to write an equation as the input....
View ArticleImporting a file from AutoCAD to COMSOL
I have created a 3D building model on AutoCAD and wish to import it to COMSOL for CFD analysis. Can I know the process for importing?
View Articlea question of memoy
Hi! I have one question about memory！ My computer have 90G Memory and 12 CPU，when compute the case，maxium 12G used，still have 78G memory is not occupied，my version is 4.3, win7 64bit；how can i fully...
View ArticleVelocity of solution
Hi, Since it depends what speed calculations? I created two identical geometry. One in 2D it is counted in minutes. Second in 3D it is counted for 30 minutes to 1 hour. It is possible to calculate the...
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