Model heat transfer in block but can't get the solution
I modelled the heat transfer within a block with some air gaps. In the model, heat is transferred by conduction in the solid domain, and in these air voids, convection and radiation are also involved....
View ArticleGas flow into a reactor
Hi. I'm new to COMSOL and am puzzled on where to start. I would like to model the flow of a gas into a reactor. The gas would be at a temperature T1 and the contents of the reactor would be at T2 (T1...
View ArticleParameter Estimations by Inverse Analysis using Comsol 4.2.
Dear Sirs, I would like to have an opinion by more expert users than me. I am facing a problem of parameter estimation by inverse analysis for structural mechanics. More simply, I have to estimate the...
View ArticleNumber of degrees of freedom solved for: 96195
Dear Sirs, I am trying to understand from where the number 96195 comes from. In particular, the mesh I am considering is a tetraedral mesh of a rectangular domain in 3D ( width = 5 cm, depth = 1.5 cm,...
View ArticleModal Mass calculation
Hi Is it possible to calculate the modal mass for a particular mode shape? Can someone please explain how to do it.
View ArticleTime Integral in Frequency Domain
Dear All, I have got a simple geometry: a 1mm thick piston-disc is vibrating with a frequency of 1kHz at 1cm above the closed bottom of a (L=353mm long, Rc=38mm radius) cylinder. The maximum...
View ArticleHelp Needed: Comsol solving Error
Hi I am new to Comsol Multiphysics 4.2a. I built a model & try to run it but after clicking compute and it gave me an error specifying the following feature has encountered a problem: -Feature:...
View ArticleWeakly compressible Navier-Stokes Equation
Can Acoustic module be used with Weakly compressible Navier-Stokes equation module to simulate the plate's natural frequency due to sound wave under fluid flowing over it?
View Articlezero induced current density at conductor boundary, is this normal?
I'm modeling a coil-over-steel-plate system using 2D Perpendicular Induction Currents, Vector Potential mode (emqa), time harmonic analysis (f=1.0 MHz). The calculated induced current density Jz at the...
View Articlei need help for wind turbine simulation
Hi everybody.. i have to do wind turbine's blade fluid simulation. ( like this http://www.youtube.com/watch?v=t5Ioi_4bdL0&feature=BFa&list=LLzuYZUfzOzTpLaduSXQQqew)
View ArticlePML and scattering boundary condition in v4.3
HI, Is it necessary to define the outer boundaries of a PML as scattering boundary layers to obtain the losses of a leaky waveguide? In v3.5, I have defined the outer boundaries as perfect electric...
View ArticleHow to apply ac voltage
Hi all I want to apply ac voltage(using piezoelectric excitation) to an accelerometer to perform transient analysis. I have tried the SPICE circuit editor, but it supplies only dc voltage. Is there any...
View ArticleProblem: Oil Droplets Seem To Dissolve In Water (Two-Phase Flow, Level Set)
I have a problem with my "Two-Phase Flow, Level Set" simulation in COMSOL 4.2. I am trying to simulate the formation of oil droplets in water by hydrodynamic flow focusing. The water and oil are...
View ArticleConvergence issues with level-set conservative form
Hello Everyone, I am trying level-set conservative form for droplet generation in flow focusing device. I have tried the following: (a) non-conservative form: it converges well but mass conservation is...
View Articlethermal Diffusion Coefficient or Thermodiffusion
Hi all I am trying to solve a problem of a binary system for the moment using Comsol version 4.3 to study thermal diffusion or thermodiffusion. It consist of solving beside the fluid flow and heat...
View ArticleImplementing Floquet BC with Linear Extrusion/Pointwise Constraint
Hi, I am trying to implement the Floquet BC with Linear Extrusion/Pointwise Constraint as indicated in the thread : http://www.comsol.com/community/forums/general/thread/5633/ I do not have access to...
View Article3D Multiphase flow
Is it possible to do a 3D multi-phase flow simulation? I tried to, but it wouldn't let me add the Physics to the model.
View ArticlePer-unit-length resistance and inductance extraction
Hello, I have the following question. Does anybody have any ideas how to extract per-unit-length resistance and inductance using 2D-mesh in COMSOL? I don't know, how should I excite my conductor, so it...
View ArticleMesh Error
Hi Guys, I got an error when I was meshing my object. Here it is: "Tetrahedron element has wrong orientation." Is there anybody can help me about it? Thanks
View ArticlePoission's ratio problem related to Structural Mechnics
Dear all, I just started to learn COMSOL and tried to conduct a simple simulation of deformation of an elastic plate by a face load. I used Solid Mechanics model in 4.3 edtion. 1. When I set the...
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