Multigrid failure during solver
Hey all, I'm working on a 3D model of a microfluidic system using the laminar flow (spf) and transport of diluted species (chds) physics models. I've got everything modeled with all the physics...
View ArticleHow to extract the stiffness Matrix for a certain element?
Dear all, Hi. I need to extract the stiffness Matrix for a certain element or node before assembling. The "mphmatrix" command gives me the results for whole geometry (After assembly). I wonder if there...
View ArticleError-Automatic remeshing
Hi, I encountered a problem about "Automatic remeshing" with "deformed geomerty" and Time-Dependent Solver When I ran the program, Comsol always displayed a Error: Unsupported operation on this type of...
View ArticleOut of memory during LU factorization.
hi i am using extra fine mesh for my simulation purpose because with normal and fine mesh it is unable to create mesh in my 3D model. while simulation i got "Out of memory during LU factorization". how...
View ArticleAutomatic remeshing with deformed geometry/moving mesh singularity
Hi, I am trying to model a sphere that changes phase from the outer radius moving inwards, but I'm having some difficulties. Using deformed geometry I can simulate it up to a certain time, however...
View ArticleError
Hi everyone!! i had following error in my model.. can any one say what it is?? Unknown function or operator. - Name: mod1.mf.mtcd1.ccc1.int_term
View ArticleSimulating strain due to lattice mismatch
Hello, I'm trying to simulate the strain that is developed due to lattice mismatch in a core/shell structure, where a shell of one material is epitaxially grown on a sphere of another material, with a...
View ArticleTips for STL Import?
Hello all, I've been struggling with the import of a simple coil. Was wondering if anyone had any tips for how to build an STL file for the best success. I've attached a few images, no matter what...
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 ArticleUnsupported Topology of Domain
I'm getting an error node saying "Unsupported topology of domain" with another error node inside it saying "Unsupported topology at vertex". What does this mean?
View ArticleA task melting of basaltic crumbs a plasma unit
There are 3D plasma unit model, some results were obtained. Namely, the temperature distribution and melt boundary. However, the melting process itself, I can not simulate. To install the contents...
View ArticleSimulating antenna scattering parameter S11
Hello, I am trying to get the scattering parameter S11 of a patch antenna. In order to avoid reflections, I use PML which is thickness of 1 wavelength. However, I have marked that S11 results change...
View ArticleLearning meshing, any suggestion for beginners?
I have a complicate geometry and needs to be meshed for microfluid flow simulation. However, I've only used the default meshing method before, which does not work for this current case. How could I...
View Articlegeometry meshing
dear comsol users, i have problem about my mesh geometry (as attached). i build the 3D geometry using these sequences : 1. build 2 parametric surface by interpolating point value (from xyz file) 2....
View Articlewrong result with boundary layers in 3D
hello everyone, i'm simulating an iron needle in an alternating magnetic field in 3D. Because of the skineffect, i add boundary layers on the surface of the needle, in order to calculate the magnetic...
View ArticleContinuity Boundary in ALE + Fluid Flow + EC
Dear Comsolers ; I am modeling a transient discharge through a flowing fluid in a nozzle. one of the electrode is moving so i created a sliding moving mesh for the movement by creating an assembly...
View ArticleCan I simulate the motion of resonant scanner with a laser beam incidence and...
I'd like to see the motion of the beam incidence onto a resonant scanner travels with 20 degrees wide in front of a quartz window of a closed hollow spherical geometry. It is important to see the...
View ArticleLiquid-Vapor interface drops very fast
Hi I have encountered a problem in COMSOL when using the “laminar two-phase flow, moving mesh” physic. A simple model indicating what I am trying to solve is provided in the attachment. As you can see...
View ArticleFind force field acting on a 3D linear elastic material knowing displacement...
Hello,I'm a beginner of Comsol. I want to model organ deformation using solid mechanic module. In my model I consider that an organ (a parotid ) is made of a linear elastic material with the basic...
View ArticleLevel set/Phase field with mass addition
Hello all, I am trying to combine the level set/phase field method with mass addition, but I couldn't find a way to implement it. I saw that the level set/phase field examples in gallery basically...
View Article