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

general VOF setting

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

LinkBack Thread Tools Display Modes
Old   December 26, 2010, 10:40
Default general VOF setting
New Member
Join Date: Dec 2010
Posts: 2
Rep Power: 0
MarkBiz83 is on a distinguished road
I have to do a classic study with the VOF on a hull of a ship, the problem is that I searched the internet possible FLUENT settings to my problem but I could not find an acceptable solution.

In particular, I active
Stady - VOF - implicit scheme - open channel flow - implicit body force

I set the volume control: (BC)
- two in faces (one for water, one for air), both with "pressure inlet" and option of open channel active (I impose the velocity of the fluid and the height of free surface)
- one output face, "pressure outlet" with the same impostations of inlet faces (open channel active and gauge pressure = 0)

I make a patch to impose initial conditions:
- initial velocity of fluid
- volume fraction of volume control and I impose rate = 1 to the proportion of the volume representing the water.

From a first view of the problem seems that I have everything correctly set up. But when I start the simulation, even if I arrive at the convergence of solution, the velocity of the fluid are completely different from my case study!

For exemple if the initialization was set at 10 m/s, after the convergence I find that the speed is at 5-6 m/s. It's not what I want to study, I want to simulate a channel with the velocity of the fluid determined by me!!

Please someone tell me what is wrong (except my english )!

Many thanks in advance
MarkBiz83 is offline   Reply With Quote

Old   December 28, 2010, 09:16
zhao peng
Join Date: Mar 2009
Posts: 41
Rep Power: 10
zhaopeng is on a distinguished road
I think you need not to define water and air inlet separately with this method.
zhaopeng is offline   Reply With Quote

Old   December 28, 2010, 12:22
New Member
Join Date: Dec 2010
Posts: 2
Rep Power: 0
MarkBiz83 is on a distinguished road
no, this setting is correct, i read this in ansys's manual, i have another problem but I don't know what it is!
Perhaps the Fr number in too high.....
thanck a lot too!
MarkBiz83 is offline   Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cells with t below lower limit Purushothama Siemens 2 May 31, 2010 21:58
VOF setting for ship's hull study simone b. FLUENT 0 December 1, 2008 12:34
VOF and setting boundary conditions dave00001 FLUENT 0 January 25, 2008 13:37
A Problem with setting the time step in VOF model Le FLUENT 2 July 20, 2006 22:00
Warning 097- AB Siemens 6 November 15, 2004 05:41

All times are GMT -4. The time now is 09:11.