how to simulate the strain/stress of the beam at 1m/s2 70Hz acceleroration?
Dear Sir, I have read several of your very useful answers here. Thanks a lot. I built a beam structure using the solid mechanics model, did the stationary strain/stress analysis without any problem. I...
View ArticleRadio frequency (and general) convergence question
I have a model which COMSOL is having a very difficult time finding a stationary solution for - the solver gets a fair way, but then tends to oscillate and never settles down to a converged solution....
View ArticleCOMSOL in parallel mode: a speedup of 20% using 4 cores?
Hello everyone, I have performed the following experiment. Using the command -np #cores, I have forced COMSOL Multiphysics to use 1, 2, 4 or 8 of the available cores on my computer. I also used the...
View ArticleLater version of COMSOL has robuster and stabler solvers
Dear all, I just want to share my recent experience with a convergence problem. During last several weeks I was struggling with convergence problem. The model has two 2nd-order PDE and Electromagnetic...
View Articlesegregated vs fully coupled solver in comsol
Hi All, I have compared these two solvers for a heat transfer case with surface-to-surface radiation. Acutually simulation results, i.e., temperature distribution in the domain, are quite different....
View Articleout of memory during assembly
Hi All, I am running a heat transfer with radiation, and the error message says "out of memory during assembly". Rigth now, I am using a workstation with 48GB memory. I check the element number, and it...
View Articlewhy COMSOL is solving so slowly
Hi All, I am running a case with radiation heat transfer. The 3D geometry is quite simple. Number of degrees of freedom solved for: 56826 (plus 39748 internal DOFs), and element number is around 24K. I...
View ArticleAcoustic Band Structure of Metamaterials
Hi folks, I have been trying to find the band structure of an acoustic metamaterial. I have been attempting to adapt the "Bandgap analysis of Photonic Crystal" tutorial given for COMSOL 3.5a to 4.3. I...
View ArticleSkip unsolvable parameters in parametric sweep?
General question. I run a parametric sweep and occasionally one of the parameters causes a simulation that doesn't converge. e.g. the parameters are param = 1, 2, 3, 4, 5 meters and this simulation...
View ArticleStructural optimisation
Hi, I am using a livelink from Solidworks to Comsol in order to import 3D geometry and quickly define some geometry parameters. I've made a structural analysis with applying torque load to my model and...
View ArticleMultiphase Stirred Tank
Hello! I'm trying to simulate a stirred tank of water with air bubbles in 2D Axisymmetric model. But, In the bubbly flow module doesn't exist the condition "sliding wall" Can you help me with this?...
View ArticleCoupling Stationary fluid flow and transient solute transport to AC/DC module
Hello, I'm not the most proficient COMSOL user yet, and I have a 2D problem in v3.5a that would seem to be rather simple but has proven difficult to me thus far. My problem is as follows: I want to...
View Articleinternal DOF
Hi All, I am running a case with element number of 0.18M, and number of degrees of freedom solved is 311413 (plus 200428 internal DOFs). What is the internal DOF? And I select the fully coupled solver....
View Articleradiation heat transfer
Hi Ivar, Since you are the expert in radiation heat transfer, I wonder if you can help with some problem in radiation heat transfer. I am running a 3D case with surface-to-surface radiation heat...
View Articlefrequency domain using reduced basis (modal)
Hi all, I'm trying to make a frequency sweep on a (big) model of an acoustic cavity, with specified surface impedance as boundary conditions. If I use the "Frequency domain" study, everything goes...
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 ArticleCoefficient form PDE with Dirichlet boundary conditions - Problem with...
Hello, I have a Coefficient form PDE with Dirichlet boundary conditions with two dependent variables. The dependent variables range -5<v1<5 for v1 and 250<v2<600 for v2. The model converges...
View Articlehow to simulate the strain/stress of the beam at 1m/s2 70Hz acceleroration?
Dear Sir, I have read several of your very useful answers here. Thanks a lot. I built a beam structure using the solid mechanics model, did the stationary strain/stress analysis without any problem. I...
View ArticleRadio frequency (and general) convergence question
I have a model which COMSOL is having a very difficult time finding a stationary solution for - the solver gets a fair way, but then tends to oscillate and never settles down to a converged solution....
View ArticleMulti-steps simulation (100 and more)
Hi! Is there any way to optimize solver to solve hundreds of steps? I'm trying to simulate tunnel construction process and there is a lot of steps. Right now with standard settings at the beginning...
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