coefficient form pde
i was going through a comsol file. It has coefficient form pde implementation. for defining the diffusion coefficient c, the value entered is0.001*D11(x,y,z)where D11 is a interpolation function . What...
View ArticleHow to construct a Hexa-/Octa-gon 3D "cone" in comsol
Dear all,For my heat transfer in soild model, I am trying to study the thermomechanical behavior, e.g. bulk temperature distribution and structure deformation, of some solid structure due to heat...
View ArticleMagnetic field simulation of a Quadrupole
Hello, I am using the MagnetFields module to simulate the magnetic field of a permanent magnet quadrupole arrangement. 1) I am now wondering why the result of my 3D plot (streamline) ist not...
View Articledrude lorentz model
i am working on wave optics module and using metal layer in my model for this layer when i gave permitivity in terms of real and imaginary part let epsilon=5+8i and use this value in VARIABLES for...
View Articlegeneralization of second harmonic generation model
Hello every one, In the second_harmonic_generation model in the Application Libraries for both the RF and the Wave Optics Module, the coupling is introduced using a Remanent electric displacement field...
View ArticleAdding a layer of air in a thermal actuator?
I am modeling a thermal actuator and would like to account for conduction through air between the small gap of two beams however I cannot get it to converge. I'm tryied to add a layer using heat...
View ArticleThe difference between screen window and grille
I want to define a surface represents "acoustic mesh", should I choose screen window or grille?
View ArticleTime dependent heat flux, T-exterior input
Hello, I am reletively new to comsol, I am trying to solve a transient heat transfer problem, the heat transfer occurs in domains of different materials. Theortically there will be a heat transfer...
View ArticleImporting Sentaurus TCAD mesh in COMSOL
Hi all, I am using Sentaurus TCAD for semiconducor device simulation (Poisson equation coupled with continuity equations), and put the results in COMSOL for further use. Therefore, I need to use a...
View ArticleSingularity Matrix in TEG
Dear all, Hoping all is doing well. I've built a simple model for thermoelectric generator 2D, but i have an error during run the model related to singularity matrix. Also i have a union in Definitions...
View ArticleDisplay some different results in the same graphic in Application Builder
Dear I want to make some different results displayed in one graohic in Application Builder,just like the enclosure shows,yesterday i got it,but i don't know why?or! it's just comsol's bug?
View ArticleProblem of the Electrical-Mechanical-Electrical Process of Piezoelement
Hi!I have a model with 2 piezoelemts sticked together. On the left side I input a 1V 10kHz sin signal and on the right side I can only get about 0.1V. I have also made a experiment with 2 piezoelements...
View Articlecompensate for hydrostatic pressure approximation
I am including gravity along with pressure boundary conditions in fluid flow simulations and see an option to "compensate for hydrostatic pressure approximation." I cannot find a description of this...
View ArticleType of error shown in convergence plots
What exactly is the error shown in the convergence plots and how is it estimated (is it based on the residual or the difference between the current and previous solution or something else)? Does the...
View ArticleAdding Coils Around Human Head Model
What specific steps do I need to take to add coils around my mesh and visualize the resulting magnetic fields on the head?Here is the link for the project file since it was too large to...
View ArticleAssign the material for background in RF module
Hi all,I am simulating an aperture in RF 3D module. I created a silicon ellipse lens and an aperture, and I wanted to see the far field beam passed through the aperture and the silicon lens. And I want...
View ArticleSemiconductor module，boundary condition
1D PN junction，the 'continuity/heterojunction' is set to the interior junction point by default. How to define an additional ‘trap-assisted surface recombination’ at this PN junction point?
View ArticleHow to design a golay coil in comsol ?
hei.I want to design a golay coil ( 10mm radius , any length) and monitor electromagnetic field arround it. How to design the coil it in comsol. Any tools to design partucularly ? or any similar...
View ArticleEpson printer Error
I have installed a new epson printer, but there are lots of issues associated with which also includes epson error code 0x97 any ideas how to resolve the same?
View ArticleRemeshing problem?
I am simulating a nanoparticle "sphere" moving through a creeping fluid flow. Two physics are activated : 1- creeping flow 2- moving mesh ALEThe ALE Boundary conditions are : - Prescribed mesh...
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