Help: Why is Initial value changed after calculation?
Hello, everyone. I build two models （both are PDEs）in one file. For the first one, initial value is A0, a log-normal distribution. For the second one, initial value is B0, also a log-normal...
View Articleproblem with selecting the domain, boundary or edge
Hi All, I don't know if you guys have encountered such problem: when I try to select the domain, boundary or edge from the graphic window, I cannot select anything. It seems that the selection by...
View Articlesoil plasticity in poroelasticity
I am doing a project using poroelasticity interface, but I wan to consider plasticity behavior of porous materials, so I need to use plasticity constitutive model for porous materials. How do I add...
View Articlejava.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 Article