CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

FLUENT VOF for ship's hull

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

LinkBack Thread Tools Display Modes
Old   December 1, 2008, 12:23
Default FLUENT VOF for ship's hull
simone b.
Posts: n/a
Hi everyone, I'm trying to simulate the flow around ship and I use multiphase flow VOF in FLUENT for analize this type of problem. I use a fully hexa mesh with high qualty ( determinant 3x3 from 0.6 to 1) generated with ICEM CFD

My setting is Reynolds Stress Model, VOF Implicit with open channell formulation, seady state I've tryied a k-w SST viscous model too.

I have some problem about this simulation:

1) My simulation diverge with k-w SST, and with the RSM i need to decrease more the under relaxation factor (0.15 max)

2) If i try to simulate a case with y+=50 or less, after 200 iteration the simulation diverge.

What can i do?? What type of setting is required??

If someone have any information or solution fot this type of problem please send me at my email :

Thank's for attention.

regards, simone
  Reply With Quote

Old   December 2, 2008, 05:30
Default Re: FLUENT VOF for ship's hull
simone b.
Posts: n/a
Anyone can help me?? Please i'm in very difficulties....
  Reply With Quote

Old   December 2, 2008, 07:24
Default Re: FLUENT VOF for ship's hull
Bikini Girl with Machinegun
Posts: n/a
1. Nobody will be able to help you when you give very few details about your problem.

2. People help when they can. You can't hurry them because you have a deadline.

3. You are using CFD on ship problems. Haha! Which idiot talked you into doing that?

  Reply With Quote

Old   December 2, 2008, 07:53
Default Re: FLUENT VOF for ship's hull
Posts: n/a
A little harsh, don't you think Bikini Girl?

The guy is desperate and needs help. Plus, he did a reasonable job of explaining his problem, at least enough to get a discussion going. Unfortunately, I do not use Fluent, so I can't help.

I'm guessing the Fluent tech support was of no use?
  Reply With Quote

Old   December 2, 2008, 14:29
Default Re: FLUENT VOF for ship's hull
Posts: n/a
The most helpful answer I can give you is to underrelax the solution dramatically until it has stabilised. When I say dramatically, I mean that for the segregated solver you would be looking at relaxation factors of 0.05 or so, and for the coupled solver a CFL < 0.2. Some solutions will only work with the coupled solver. If you are desperate, give me some money and I will do it for you

  Reply With Quote

Old   December 6, 2008, 08:45
Default Re: FLUENT VOF for ship's hull
Posts: n/a
Its seems to be tough in fluent using VOF. I think you may switch over to ANSYS CFX 11.0. Robust solver.
  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
VOF model with planning vessel vmeertens FLUENT 4 August 9, 2013 16:12
about VOF. Fluent or CFD ACE? Jiyeon FLUENT 5 January 17, 2012 05:37
Fluent jobs through pbs ibnkureshi FLUENT 5 June 9, 2011 13:43
Does Fluent Calculate VOF before Momentum ? Ganapathy Fluent UDF and Scheme Programming 1 April 7, 2010 10:56
tutorial on VOF in FLUENT 12 thinktank FLUENT 2 December 23, 2009 11:21

All times are GMT -4. The time now is 23:35.