|
[Sponsors] |
May 14, 2007, 11:33 |
Model for Capillary
|
#1 |
Guest
Posts: n/a
|
hi,
i am trying to modell a simpel capillary effect. i got a 2D modell from a capillary and want to simulate the water runnig out of region between two pins (like a 3d hole in a surface).i will make it a twophaseflow with freesurface, so the air can fill up the capillary. The mesh is fine enough to represent the expected curvature. Do i have to start with initializing water and the air with 50% volume fraction each in the whole domain and do a steady state run OR initializing with air in the whole flow domain and create water inlet at the sides/top and do transient run?? does cfx model capillary effectes by setting up surface tension and wall adhesion? thanks a lot mathew |
|
May 14, 2007, 17:11 |
Re: Model for Capillary
|
#2 |
Guest
Posts: n/a
|
Yes, CFX can handle this. However, you have to include a surface tension and a surface tension model.
Remember that you have to use very small timesteps because surface tension is implemented explicitly. Gert-Jan www.bunova.nl |
|
May 15, 2007, 05:30 |
Re: Model for Capillary
|
#3 |
Guest
Posts: n/a
|
thank you for your response
i´ve chosen 5x10^-6 for the timestep so the simulation is taking a long time but i finally reached 6 coeff.lops so that is quite okay with me. I have a free surface flow with two continuous fluids,therefore i only have a "Continuum Surface Force" and a primary fluid which is water in my case. Actually i am doing a singel-bubble-evaporating at a wall and now i am trying to include more and more physical forces. mathew |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
question about turbulence model selection and sensitivity | karananand | Main CFD Forum | 1 | February 26, 2010 05:41 |
Centrifugal Pump and Turbulence Model | Michiel | CFX | 12 | January 25, 2010 04:20 |
Problems bout CFD model of biomass gasification, Downdraft gasifier | wanglong | FLUENT | 2 | November 26, 2009 00:27 |
Reynolds Stress model in CFX vs Fluent | Tim | CFX | 1 | October 7, 2009 07:19 |
Grid resolution for full-scale and down scaled model | gravis | Main CFD Forum | 0 | October 2, 2009 11:27 |