Unexpected results with "Ground" BC
Hello, I do most of my modelling using electrostatics steady-state solutions. One thing that comes up in my models alot is a grounded metal object in a linear, vertical electric field as shown in the...
View ArticleTwo interdependent studies - but I cannot use results from frequency domain...
Dear all, How can I use the result from a parametric (parameter 'b') sweep-frequency domain study (e.g. emw.Ez(b) ) in another function defined under Definitions (e.g. f(emw.Ez(b)) ) which is used as...
View ArticleRadiation in conjugate heat transfer
Hello all, I have the CFD module and am using conjugate heat transfer. This means that I don't have surface to surface radiation but I do however have surface to ambient radiation. I am modelling...
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 ArticleFollowing the manual but got the false result
Dear all, It's weird that I followed every step in the manual but got a wrong result for thin layer diffusion model. I'm a COMSOL beginner user; would anyone who knows the reason tell me how to resolve...
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 Articleerror: The object 'Type: Save Point Geometry Tag: geom1' is not contained in...
Hi all- I have been working on a model for some time, and just trying to optimize the solver settings. I saved the model today, and then opened it up again to work on it, and now get this error for any...
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 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 ArticleProblems with results of simulation in a range of frecuencies and a specific...
I am tried to simulate the microwaves propagation in a waveguide transition of rectangular to circular. The problem is the following: when I perform the simulation in a range of frecuency, the obtained...
View ArticleScattering boundary conditons for non-normal incident (using weak-contribution)
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...
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