java.lang.ClassCastException when using LiveLink from MATLAB
Hi there, I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models. However, yesterday I ran the same MATLAB code as I always do, but...
View ArticleMaximum number of Newton iterations reached
I have imported a 3D meshed model from simpleware to COMSOL 4.3b. Some of the materials of the model are Hyperelastic, Neo-Hookean. While running the model via Direct Solver at 99% of progress there is...
View ArticleOil Tank wtih heater
Hello, I am a new Comsol user. I am trying to model an oil tank heated by a U heater.The heater use oil at a higher temperature. The cold oil in the tank is at 30°C and the hot is at 250°C.I use...
View Articlecreating plots is extremely slow
Dear Forum, creating simple line plots (with global scope) of model results is extremely slow. For quite large model files (2-3 GB of size) it sometimes takes several hours for one simple plot on a...
View ArticleSelecting a point
I want to get the co-ordinates of an arbitrary region within my model so I can see how the pressure changes at that point. Does anybody know how to do this?
View ArticleAC/DC module ground problem
Hi i am new to comsol, i am working on an electrostatic, I want to get the electric field due to a charge distribution, but when i work without ground, i got an unexpected solution totaly, and when I...
View ArticleHow to use Two Different Times steps in Solver Parameters?
Dear Sir, I am using COMSOL 3.5a. And I am running my simulation for 6hrs. But I want to run my simulation in two different time parts. (i.e. for 1hr i used solver parameters for time stepping range is...
View ArticlePhase 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...
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