Phase change: freezing and convergence problem
Hi, I'm currently working on a water solution freezing model including the phase change. I use the COMSOL model : www.comsol.com/model/phase-change-474 Geometry: I just add a metal part below the...
View ArticleSetting a point to 1 and calculating impressed current density
Hello, I want to set a point to 1 in my geometry, and calculate the impressed current density that it creates. Gizem
View ArticleParametric Sweep of the Move funcion
Hi, I would like to so a simple parametric sweep of the position of an element in a 2D model. I define a parameter under global definitions and then under Geometry1 I Move1 by that parameter....
View ArticleFSI tutorial: Warning: Inverted mesh element near coordinates
I downloaded the FSI example from website. Fluid-Structure Interaction Model ID: 361www.comsol.com/model/fluid-structure-interaction-361 It is a classic problem. It looked good. But when I only changed...
View ArticleRelease Features
I'm running a simulation in the Free and Porous Media Flow physics and have run several successfully so far, but I've modified my geometry and am now receiving this error: Errors during multiphysics....
View Articleequation system
I want to use the following bidomain equation in my simulation :∇·((σi +σe)∇φe)=−∇·(σi∇Vm) I have two spheres one within the other as geometry. Inside the smaller sphere I want to introduce Vm as a...
View ArticleDifference between form union and form assembly
I performed the "compose" operation on my geometry deleting some parts which I did not want, but then when "from union" those deleted parts showed up again in the final geometry. Only when I do "form...
View Articleplacing electric and magnetic dipoles on top of thin (~50 nm) gold film
Hi, Can someone help me to model electric and magnetic dipoles on top of gold (~ 50 nm) thin film. I am using RF module for this. I'll really appreciate any help. Thanks.
View ArticleModel coupling to 2D to 3D geomety (General Extrusion)
hello all, I want to do a model coupling of 2D geometry and 3D. For this i used general extrusion coupling for that. I want to couple outlet ( along y axis) and inlet boundaries of 3D geometry through...
View ArticleInfinite Elements - Electrostatics
Hi all, I try to simulate an charged object inside an unbounded region. I use the AC/DC module --> Electrostatics in Version 4.1. I attached the file. The outer bounds are ground and the charged...
View ArticleCoupled magnetic and solid-mechanics simulation
I have a question about coupling a magnetic study to a solid mechanics study. I attach to this email a simple model to explain my question. In the model you can find a permanent magnet with a round...
View ArticleHow to cut a geometry
Hello, I have a 3D geometry and I need to cut half of it to create a symmetry plane. Can you please describe the steps. Thanks. Regards, Dimitris
View ArticleEmpty parameter list
Hi everyone, I'm beginner to COMSOL and I'm modeling hyperthermia cancer treatment with magnetic nano particles. I'm using bioheat transfer for the body cells, mixture model for modeling nano particle...
View Articleselecting the surfaces for surface-to-surface radiation
Hi, When I definie the surface-to-surface radiation boundary conditon, it is quite troublesome to select the surface one by one. Is there any easy way to select all surfaces for surface-to-surface...
View Articleaxisymmetric hollow cylinder model with Boundary condition
Hi, I want to draw a axisymmetric hollow cylinder model which is cut axially along the length. The inner tube radius is 12.5mm, shell side radius is 25mm, with length of 1.5m. Also how i have to given...
View Articleelectrostatic potential induced by charges
Hi, I am fairly new to comsol, your help would be helpful, I have an electrostatic model composed of two electrodes and medium( air, plastic), just like an parallel capacitor. In my 2D model, I built a...
View ArticleNormal flux = 0
After update to 4.3b a new feature emerged: the normal flux at an electrode (viz electric current), for example, is always zero. If my electrode happens to be parallel to xy, xz or yz plane, I can...
View Articleediting mesh
Hello, Is it possible to define mesh elements as subdomain and give each of them a source like current density? or is it possible to give each node a source? Thanks, Gizem
View ArticleComsol Error
Hi, I have tried to "remesh deformed geometry" on a dataset in order to export the deformed geometry as stl-file but I get the following error: =>unsupported operation for mesh of virtual composite...
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