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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...

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Imposing 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...

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moving 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

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freeze-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...

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simpel 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...

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How 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...

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Two 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

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Heat 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...

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Mixer 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...

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Compressible 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...

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Help 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...

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How 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...

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Vibrating 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...

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Checking 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...

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Laminar 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...

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how 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...

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Viscoelastic 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...

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Export 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...

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Set 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...

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Difficulty 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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