viewing 2d plots
Hi, this seems to be a simple thing but i cant seem to figure it out. i have very high aspect geometry in my model so it helps to view it (in 2D) with the axes not being equal. this was simple in...
View ArticleImposing Dirichlet domain condition
Hello all, I wonder if there is a way to impose a Dirichlet condition not on a boundary but on a domain. Let's say, for instance, that at a time tn of my calculation I want to impose null velocity in...
View Articlemoving mesh and electrostatics coupling
Hello everyone Have you ever encounter the moving mesh and electrostatics coupling problem? If you have,thank your for your advise Thanks a lot
View Articlefreeze-drying; convective heat transfer with Sublimation/Resublimation
Hi guys, I’m writing my bachelor thesis and want to do a simulation of freeze-drying of coffee with comsol 4.4, but I have not much experience with it. I made some tutorials and simulated examples...
View Articlesimpel model of an extruder
Hi, We are struggling with a simpel representation of an extruder. We first want to simulate a rotating rod in an concentric cilinder. The fluid around the rod is water (laminar flow). Later on, we...
View ArticleHow to put friction in non newtonian fluid?
Hellow, I really wonder the method to use friction function in 3D. But i couldn't find it... already i did the simulation of friction in 2D. even if the modelings of 2D and 3D are same, results are...
View ArticleTwo Phase Flow
Hi Naveed, I am working in two phase flow. Can i get any example of two phase flow model. Any input will be greatly appreciated. Thanks
View ArticleHeat exchanger
Hi I have a question regarding modeling an air-air heat exchanger I hope you can help me with. I have a serpentine flow pipes and a box for the air forced convection. I started with a very simple...
View ArticleMixer evaluation with particle tracing
Hello, I need help with a project I'm working on. I have microfluidic mixer and I would like to evaluate its mixing quality. In order to visualize what is happening inside the mixer I had used the...
View ArticleCompressible Navier-Stokes with Non-newtonian viscosity in PDE module
Hello, I am new to COMSOL and I've been trying to model some incompressible Navier-Stokes system with variable viscosity, a Carreau viscosity to be specific. I have used the CFD module to model this...
View ArticleHelp needed with Coefficient of variation calculation in comsol
Hello, I need help with a project I'm working on. I have microfluidic mixer and I would like to evaluate its mixing quality. In order to visualize what is happening inside the mixer I had used the...
View ArticleHow to define a mixture of two miscible liquids at the inlet?
Hello, I have a question about how to define a mixture of two miscible liquids (for instance water and ethanol) at the inlet. My 2D geometry is as follows: I have two parallel rectangles (representing...
View ArticleVibrating sphere
Hello All My name is Montassar Sharif I am new to Comsol I am very interest with 4.4 version of Comsol , I have question and it is so serious question for me ??? How can I make solid sphere vibrating...
View ArticleChecking continuity equation
Hello, I'm currently modeling incompressible flow with the Navier-Stokes equations in a Y-shaped pipe with newtonian properties (a fluid similar to water). My problem emerges when I try to check the...
View ArticleLaminar flow of Carreau fluid with variable density
Hello, I am using the Laminar flow physics together with the Carreau fluid properties and I was trying to write a formula for the density as a function of pressure 'p'. From my experimental data I have...
View Articlehow to set two conditions for one boundary condition(vector)?
Hi all, I want to define two conditions for one part of rectangular that I have in 2D (xz) and put two different value of pressure head in one boundary condition, like Hp=0 if z>= - 0.5159m and...
View ArticleViscoelastic fluids
Hi, I need to model a two-phase flow with water and a viscoelastic oil. Are there any in-built viscoelastic models available for fluids (like UCMaxwell, Oldroyd-B, PTT, etc) ? I can find such models...
View ArticleExport corrected velocity field data
Hi, My model is a simple single phase fluid flow with the laminar flow module. I need to export the corrected velocities that hold the divergence-free condition. I checked with the solution and...
View ArticleSet tolerance for continuity - help!
Hello, I've written previously with no success. My model uses the Laminar Flow module to solve the Navier-Stokes equation. One of the equations is a constraint, the continuity equation that states that...
View ArticleDifficulty in simulating simple H-Cell
Dear All I m new to comsol. I started to design a very simple H-cell as demonstrated in Videowww.comsol.com/video/video-239 But when I try to simulate i get this error: Failed to find a solution....
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