How to put the friction in the comsol???
Hello! I wonder something.......... i should put some data in the boundary settings of equation system. But that result was so weird.... i think the results in slip and frition states is not same. but...
View ArticlePID Controller Constraints
Hi all, I have implemented a PID temperature controller (based on Voltage control) into my model but I am having one issue with it when I change the setpoint temperature. I have the setpoint...
View ArticleMWP combined with DC
Dear Daniel, I am geting tired of comsoling... because I do not know anymore what I can do to make my models converge. i started with the waveguide microwave plasma from the model-library. I put some...
View ArticleCanceling a solve operation takes a LONG time. Why???
For some reason, canceling a solution process often takes a very long time with COMSOL (10's of minutes to hours). So what it happening that takes so much time to stop? I would think if you're just...
View ArticleConvergence problem with Comsol 4.3b
Hi Everyone When I run the model in the 4.3a, it can work very well. The convergence firstly is about 1e4 to 1e5. When the comsol software is updated from 4.3a to 4.3b, the convergence becomes 8e8 and...
View ArticleWeak form for 2-D elasticity
In an effort to learn COMSOL, I decided to model the two-dimensional elasticity equations using the weak form. I was surprised looking through the documentation that there are very few example...
View ArticleCOMSOL with Matlab syntaxis (plotting and extraction datas while optimization...
hello. I'm trying to make belows these days. First, I've opened a 'Topology Optimization of a Loaded Knee Structure' from the model library that is aleady exist. And I clicked 'reset history' then...
View ArticleFloquet boundary conditions in multilayer structure.
Hi all, I am trying to simulate a multi junction solar cell (for eg: Si/SiO2/Al) and trying to study the electromagnetic behavior of it. For periodic conditions I had used floquet boundary conditions,...
View ArticleError - 3D LID Driven Cavity Flow
Hello Forum, i try a computation for the "3D lid-driven cavity flow" model. I got a Comsol Error: Failed to find a solution. Divergence of the linear iterations. Returned solution is not converged. I...
View Articleline integration of scalar field for use in study, not as result
hello, i am having great difficulty figuring out how to use a line integral inside of a study. for example, i am seeking to use the line integral of a temperature field (1st interface) across a line in...
View ArticleCUDA and COMSOL
Dear all, I have a new NVIDIA Quadro GPU and I would like to use it to accelerate my simulations, is it possible to use it somehow? I looked for some informations and it seems to me that CUDA it's...
View ArticleProblem to converge a Reaction engineering, Diluted species transport and...
I want to degrade one component in a 3D geometry along with diluted species transport and laminar flow in it. My simulation runs okay in stationary study (i used step function here). But when i want to...
View ArticleNew to COMSOL - Issues with Modelling a MEMS Coated Micromirror (2D)
Hi, I am new to COMSOL software, however I have started building a 2D model of a MEMS Micromirror with a thin film coating of SiO2. My aim is to match experimental results regarding the radius of...
View Articlesmart parametric sweep?
Hi, I was wondering if in Parametric sweep it is possible to update Study Settings based on the up-to-date results of the computation (i.e. based on the results computed from the previous step of the...
View ArticleComments on an old topics
Dear Ruud, I have a question about one of your reply on an old topic:www.comsol.es/community/forums/general/thread/16346/ I also want my solver to use the previous result to calcule the next one, but...
View ArticleCoupling Electrostatic, Structural and Acoustics
I am currently trying to couple 3 different physics for my electrostatic transducer. The coupling works in the following mode: Bias or static mode and time harmonic / frequency response mode. For bias...
View Articlewhy it is different between Axial 2D and 3D in Non-Newtonian Flow.
Hellow, i have used this for about 2 weeks. but i have some problems. so i need some help. i drawn a model of the cylinder which is same both them. and they are same values, boudary conditions... but...
View ArticleTwo electrodes, four layers
Hi everyone! I am trying to do simple model using 3D Comsol Multiphysics // AC/DC module // Quasi Statics, electric // time harmonic analysis ... two electrodes, 0.5V and -0.5V, four skin layers with...
View ArticleSimple 2D model
Hi everyone! I am new around here and I have to solve this problem: I have to model human skin with two electrodes on top. Skin has 4 square shaped layers, different permitivity and conductivity....
View ArticleGhost domain, bug?
I have a curious problem with Comsol (4.3b and 4.4) with ghost domains. If i look at the geometry and select all domains, i have, ie 10 domains. When assigning materials, then the 11th domain appears...
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