Shell and tube heat exchanger simulation problem
Dear all,I'm simulating a heat exchanger with some of the tubes plugged within it.I have 19 tubes within the heat exchanger.When I 18 of 19 tubes, at different locations, I get the simulation done, But...
View ArticleMesh problems
Hello everyone,I am not too familiar with COMSOL, so it may be a basic question.I am working on electrostatics field and I would like to evaluate the electric field along an insulator. Therefore, I...
View ArticleHow to solve the problem (Mesh warning (size) :The physics controlled mesh...
How to solve the problem (Mesh warning (size) :The physics controlled mesh became empty?
View ArticleThicken non-closed mesh
Hello,Im trying to import the geomtry of a gyroide into comsol. For this purpos I generate the surface of the gyrode with 'MathMod' and export it as an .stl file with the help of 'meshLab'.I'm able to...
View ArticleHelp with meshing
Hello, I am trying to replicate the results from a paper. I am having problems with the mesh. I have attached a photo with the geometry and a description for the mesh.
View Articlesingualr matrix 3D -the 2D code works but not 3D!
HiI have a situation, I have a 2D code that works fine but when I extend the code to 3D it always has NAN or singualr matrix issue?!?!Its Navier stokes and PNP eqaution plus magnetic field, the problem...
View Article3D stress calculation: no mesh on domain 1 when choosing mapped option
Hi,I am trying to calculate the stress due to a point load in 3D block geometry. When I am using a mapped option mesh, no matter which size of mesh that I choose, comsol always return an error "no mesh...
View ArticleIncoherent propagation of light
Hi I'm working on thin film solar cell simulation on COMSOL 5.3a, and in order to overcome the incoherent propagation of light in the thick glass substrate (2mm), I'm going to use phase elimination...
View ArticleHow to do multiple static analysis steps and use adaptive remesh to update...
Hi, I'm trying to reconstruct a model of cytokinesis in this paperI've tried axisymetric model in COMSOL using the remesh of a single static step in the adaptation and error estimate as the following....
View ArticleMapped Mesh for a High Aspect Ratio Geometry
Hello,I am working on a geometry that has a very high aspect ratio and need to create mapped mesh for one of the domains and free triangular mesh for the others.I am facing couple of issues:When trying...
View Article"Failed to form solid object" Warning
Why does COMSOL give me this warning when I import geometry from Solidworks? I have the necessary licences and I am able to import, but cannot import an STL file as a solid, only a mesh. What must I do...
View ArticleSize of matrix exported from Comsol : understanding?
Deal all,can you explain how to understand the size of stiffness matrix which is exported from comsol,for example i have a 2d cantilever beam, discritized with nel_x x nel_y=20 x 10 => nnode_x x...
View ArticleBoolean Geometry Operation Failed
I'm getting the following error message when I try to mesh a toroidal inductor with a rectangular cross-section, imported from an external CAD software: "Boolean Geometry Operation Failed" (it is a...
View ArticleImprove CAD import resolution
Hi All,I'm trying to model a toroidal inductor in 3D with a rectangular cross-section. I've successfully made the CAD model, and am trying to import it into COMSOL. However, I'm getting internal error...
View ArticleModeling assembly process
Hi all,I'd like to simulate an assembly process (soldering) in microelectronics packaging which follows these steps:1) A substrate and a metal lid are separately heated to temperature T1 2) The...
View ArticleAdaptive mesh refinement error indicator
I am using the general form PDE option from the mathematics package to solve some equation and I would like to use adaptive meshing. The default error indicator is sqrt(comp1.u5x^2+comp1.u5y^2) (my...
View Article"Failed to analyze local face topology" when meshing
I am trying to mesh a 3D domain but no matter what meshing settings I choose I am getting the following error:Failed to analyze local face topology. - Face: 12 Invalid curve or surface.In the file, the...
View ArticleDynamic tip bending
Hello,I have a circular tube that is approximately 150 mm long and the last 15 mm of the tube (the tip) will deflect 30 degrees to -30 degrees. I have a velocity inlet and a pressure outlet. I want to...
View ArticleMeshing with different elements and Order of the discretisation
Hello!It's like I am solving transport-diffusion model for a 2D domain. I have made the following observations which I cannot figure out. 1.) If I use only triangular mesh without any boundary layers....
View ArticleImporting STL files
Hi,I'd like to import an stl file into a COMSOL simulation, and the online tutorial says that COMSOL supports this file type. However, when I try to use the import function on the Geometry toolbar, the...
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