Problem in Optimization by global least squares objective
Hi sirs, that is my first contribution in COMSOL discussion forum. I'm simulating an adsorption process of water vapour in silica gel grains. the model is working very good when I enter fixed value of...
View ArticleProblems with static mixer simulation (diffusion vs convective mixing)
I am trying to simulate a static mixer to assess its mixing quality through multiple iterations. It is meant for liquids with minimal diffusion such as latex paint in the realm of 750 Pa*s viscosity. I...
View ArticleUnable to solve a hyperelastic material model
Hi, I am having a problem solving a hyperelastic model that I have. I have been trying to figure out how to solve the problem for some time now but without any luck! The material model contains user...
View ArticleVirtual Work vs. Maxwell stress tensor
Hi @ all, I'm (still) try to calculate a force on a magnetic ball in the field of an electromagnet. For the permanently magnets I use an Ampère's Law with Magnetic Field: Constitutive relation:...
View ArticleThermocapillary recirculation
EDITED Hello, I am a beginning user of COMSOL. Currently, I am trying to create a preliminary model of Marangoni convection, like this one available on the COMSOL site:...
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Inlet boundary condition - coupling local inlet velocity with local static...
Dear Comsol Community, as already described in the linked discussion (www.comsol.com/community/forums/general/thread/54351/) I want to study the steady flow in the gap between an air-hockey table and a...
View Articlecan anyone suggest me how may I put initial guess in the form of table in pde...
can anyone suggest me how may I put initial guess in the form of table in pde interface for steady state calculation
View ArticleLaminar Counter-flow in Concentric Pipes
Hello. I'm relatively new to COMSOL and I've been trying to model a simple counter-flow through concentric double-pipes. Currently, I have the model in a 2-D axisymmetric configuration and three...
View ArticleRename datasets from solver
Hi, I have a complex model with lots of steps. I get completely confused about the naming of the datasets it generates. The only "trick" I have found is that for time-dependent sets I use slightly...
View ArticleJava Runtime Environment error
Getting following error, A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003da3efbc6c, pid=6909, tid=46912497239488 # # JRE version: 6.0_20-b02 # Java VM:...
View Articleerror while solving
Thank you for resending the mesh model. In continuation, I tried to solve the mesh model with JOule Heating analysis. However I obtain the error as seen in the attached file. -->Is the error because...
View ArticleHow can i set a periodic step length？
for example. range(0,10[ns],400[ns]) range(400[ns],0.1[s],1[s]) how can i set the step repeating this rule during next dozens of seconds?
View ArticlePoisson-Nernst-Planck system - Weird behavior.
I'm trying to simulate electric double layer formation near a charged wall in a cylindrical domain using a Poisson-Nernst-Planck system. I use the Poisson-Boltzmann equation to initialize electrostatic...
View ArticleGiving material properties as parameters
Hello, I wanted to know if it is possible to give material properties as parameters. I wish to perform a parametric sweep with the dielectric constant as my paramater in an electrostatics model. But I...
View ArticleMesh Problem
Hi everyone, I used scaling in order to mesh my thin plate. Can scaling mesh action affect my result? Because temperature results are revealed in a shorter range than I expected. I looking forward to...
View ArticleRun a MATLAB function in COMSOL
Dear All, I want to use a MATLAB function in COMSOL 4.4, my function is a simple example like: function out=myfunc(x) out=x; However, when I define a MATLAB fuction in COMSOL with name 'myfunc' and...
View ArticleTime estimation and dual+ cores
Hi again, I wondered if there is any way to have COMSOL estimate the time of computation before/during running it. My model was run yesterday at around 2 pm here, and now it's 11 am and it's still...
View Articleinvestigate the material and geometry dependent resonances of metallic...
Hello everyone, In my project, I added interpolation for relative permittivity and loss tangent. I want to get the relative permittivity and permeabilility. I did some things, and after adding electric...
View ArticleHow to interact with fMRI data with ".dcm" files
I have some 'dcm' files from fMRI, which is obtained from scanning an object. And these 'dcm' files can be changed to 'mph' file in mesh form. The question is how to add a electrical field to the...
View ArticleCoupling Problem: Out of memory during LU factorization
Hi, I am trying to couple joules heating with laminar flow in 3D geometry using COMSOL 4.1 (64 bit win XP OS). However I am getting the following error while solving: Failed to find a solution. Out of...
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