CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Displying interface of liquid water using VoF model

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By oj.bulmer

LinkBack Thread Tools Search this Thread Display Modes
Old   March 11, 2013, 12:46
Default Displying interface of liquid water using VoF model
Join Date: Aug 2011
Posts: 33
Rep Power: 14
pchoopanya is on a distinguished road
Hello there,

I am using a VoF model in FLUENT to model the effect of a gas and wall channel hydrophilicity on the water removal ability.

Basically, I have a simple U-turn flow channel, the air goes in at the inlet and exits at the outlet. At the bottom of the channel, a flux of liquid water is applied.

After the simulation is converged, some of the liquid water form a liquid film covering the bottom surface of the flow channel. In some cases, there is no liquid film, but some of the liquid accumulates at the corners.

Please refer to the pictures attached.



My question is simple, for a transient simulation, can we not show the animation of a liquid water? a droplet? Is it the same as defining an ISO-surface of volume fraction of liquid water and then record it at each time step when the simulation progresses?

Regarding the ISO-surface of the volume fraction of liquid water, what should be the value of interest? Which value represent the water droplet interface? Is it 0.1? or 1? I have seen somebody mention a 0.5 would be what I want, can someone confirm this please?

Best regards,

pchoopanya is offline   Reply With Quote

Old   March 11, 2013, 14:29
Senior Member
Join Date: Apr 2012
Location: United Kindom
Posts: 473
Rep Power: 19
oj.bulmer will become famous soon enough
Yes, you need to save the VF of water at every step to be able to have any animation.

Regarding free surface, how about this... Plot a graph of VF versus height from bottom of the channel to top. You will see the VF of water going from 1 to 0 (Or values close to 0) over a transition distance. This is your layer of free surface, transitioning from water to air. Focus on this transition layer and spot the VF of water exactly in the middle.

Use this VF to generate isosurface.

Workable, unless someone has better idea

pchoopanya likes this.
oj.bulmer is offline   Reply With Quote

Old   March 15, 2013, 17:42
Join Date: Aug 2011
Posts: 33
Rep Power: 14
pchoopanya is on a distinguished road
Thank you very much for your valuable comment, i'll try this !
pchoopanya is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to create interface in VOF model of ANSYS/Fluent shambansal2010 Fluent Multiphase 14 April 5, 2017 02:03
An error has occurred in cfx5solve: volo87 CFX 5 June 14, 2013 18:44
question about Heat transfer between two phases with VOF model sooroo3 FLUENT 0 February 15, 2011 04:24
plz rply urgent regrding vof model for my system garima chaudhary FLUENT 1 July 20, 2007 09:37
Define initial liquid level for VOF model Gab CFX 2 May 10, 2007 00:42

All times are GMT -4. The time now is 08:32.