NaN or Inf found when solving linear system using SOR in Double nano-Granting
Hi everyone, I am trying to simulate the intensity that a light beam through a double diffraction grating.However, when I run the computation, an error of "UNDEFINED VALUE FOUND" occurs, with detail...
View Articleconvergence error during simulation
Hello, I am doing a hyperelastic simulation on a silicone rubber sheet with dimensions 50*50*5mm, with pressure being applied on the surface. But after a certain pressure range, I get this error...
View ArticleElectrostatically actuated diaphragm
Hello, I am part of a project to design an electrostatic speaker. I am using the electromechanics module to model in 2D the displacement of a charged diaphragm in an electric field. The diaphragm is...
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 ArticleAssign pressure signal to nodes, other approach in COMSOL?
Hello together, I am quite new in using COMSOL and I encountered a problem. I have done a simulation with another FEM program and I saved the nodal values for the acoustic pressure along a certain...
View ArticleHow to use Laminar Flow Pressure results in Solid Mechanics, help?
Hi, I need to use as an input in the Solid Mecanic module the Pressure results from Laminar Flow calculations. Can anyone explain me how to do this? thank you for yor answer. Best regards, Leonardo.
View ArticleMoving Mesh velocity in tpfmm
Hi, I'm wondering how COMSOL calculates the mesh velocity (tpfmm.x_free ) in the tpfmm module, as I define a flux in fluid-fluid interface I want to know it because the velocity is very slow and need...
View ArticleMesh 'Edit' & 'Modify'
As a relative newcomer, so far I have been able to get away with the standard 'fine' 'finer' 'extremely fine' etc meshes. But now I need to be a bit more sophisticated, & I'm stuck. Firstly what is...
View ArticleMesh element volume
Dear all, I have a material property having a different value in a domain and it is function of individual volume of deformed mesh element and undeformed mesh element. Could you tell me how to get the...
View ArticleHow to mesh a 2D model with ultra huge length-width ratio?
I suppose to mesh a model which is a rectangle with 0.5nm width and 60um length. In width direction only one mesh is OK. Is there some good idea to deal with it? Thanks a lot! WU Han
View ArticleError message when building a 3D-model
Dear community, I've expanded the built-in optical ring resonator model from 2D to 3D. Additionally, I've added the same geometry above the model to simulate air and under the model to simulate a...
View ArticleMagnetic Flux Density Around a current carrying conductor
I am using Comsol 5.0. How to model and simulate the magnetic flux density around a current carrying conductor? Please explain the step by step procedure. Thank you.
View ArticleFluid Flow and Heat Transfer in Fluid/Solid - problems with convergence
Hello everyone! I am quite new to COMSOL and I am currently working on the 3D geometry I hereby attach. The geometry is built in COMSOL Multiphysics 5.0. The model is referring to a 23 meters high...
View ArticleHow to have different mesh densities on a simple, 1D geometry?
Hi. This may be a very obvious question, but I can't seem to be able to find the solution. I have a very simple 1D geometry: a line segment from 1 to 7 i.e. 1<x<7. I want to have an extremely...
View ArticleReduce Degree of Freedom antenna array
Hello, I am using RF module and have a created a model of antenna array, with which I would like to observe scattering of EM waves when penetrating dielectric material (permittivity 50-70) The antenna...
View Articleremeshing
Hello, Is it possible to remesh in a time dependent study with deformed geometry physic, only one part of the geometry? Best regards Julien
View ArticleQuestion about nodes arrangement in model solutions with "mpheval" function...
Dear colleagues, I need your advise! I work with Solid Mechanics and Pressure acoustic modules. I use LiveLink with Matlab to extract solution data from the Comsol model (v.5.2). I defined a parametric...
View ArticleToneburst signal
hello, How could I create a toneburst exitation signal or a simple sinus exitation wave signal in comsol 3.5a? Thanks
View ArticleLivelink for Matlab and COMSOL v4.2a Meshing and Solution not synchronized...
I have not found any discussion on this topic yet and I am having difficulty finding anyone in COMSOL support in North America that can help with this problem today. Basically, I simply want to take a...
View ArticleObjects Moving In Response to an Electric Field
I am new to COMSOL and was hoping I could get a hand with the following problem. I would like to model the movement of nanoparticles in a polymer medium that is sandwiched between two electrodes. I...
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