CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Effects of turbulence on freesurface

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 21, 2006, 12:21
Default I'm running rasInterFoam on a
  #1
sek
Member
 
Sung-Eun Kim
Join Date: Mar 2009
Posts: 76
Rep Power: 8
sek is on a distinguished road
I'm running rasInterFoam on a free-surface problem. The tutorial says "the free-surface treatment in OpenFOAM does not account for the effects of turbulence...". Can someone who's familiar with the innerworking of FOAM please explain what this means?
sek is offline   Reply With Quote

Old   November 21, 2006, 12:25
Default It means it is using a single-
  #2
Senior Member
 
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,758
Rep Power: 21
hjasak will become famous soon enough
It means it is using a single-phase turbulence model with no corrections for the density ratio or presence of free surface.

Hrv
__________________
Hrvoje Jasak
Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk
hjasak is offline   Reply With Quote

Old   November 21, 2006, 13:55
Default I see. Thanks, Hrv. Yet, the s
  #3
sek
Member
 
Sung-Eun Kim
Join Date: Mar 2009
Posts: 76
Rep Power: 8
sek is on a distinguished road
I see. Thanks, Hrv. Yet, the same paragraph of the tutorial (U-61, Chapter 2.3) continues "... as a consequence, all free surface somulations can be viewed as a direct numerical simulation of fluid flow...". I surmise this is not true. Even with a single-phase turbulence model, turbulent viscosity near free-surface would be much larger than molecular viscosity. And it is not going to be anything close to DNS. I would just take he entire paragraph as trying to remind us of the inherent limitations of the simple mixture-based turbulence model - it won't be able to describe complex turbulence physics near free-surface.
sek is offline   Reply With Quote

Old   November 9, 2007, 14:46
Default Hi, I am searching for a wa
  #4
New Member
 
marks
Join Date: Mar 2009
Posts: 2
Rep Power: 0
msang is on a distinguished road
Hi,

I am searching for a way (hopefully simple) to correct the k-epsilon turbulence model in rasInterFoam for the effects of density ratio and free surface. I am mostly interested in the water phase, although this may not simplify the anything. Does anyone have suggestions for a reasonable staring point, references or a solver?

Thanks

Mark
msang is offline   Reply With Quote

Old   March 22, 2008, 22:48
Default Hi Mark I am interesting in
  #5
New Member
 
Onur Dundar
Join Date: Mar 2009
Location: Davis, CA, US
Posts: 7
Rep Power: 8
onurdundar is on a distinguished road
Hi Mark
I am interesting in the same concept. I found a paper has a simple approach to the solution of turbulence near the interface for k epsilon turbulence model.

onur
onurdundar is offline   Reply With Quote

Reply

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
Initializing freesurface in 3D geometry jaswi OpenFOAM Running, Solving & CFD 9 August 20, 2008 13:27
Need following paper about freesurface analysis Morteza Main CFD Forum 1 July 13, 2006 13:32
history effects of turbulence could u please.. bajjal Main CFD Forum 2 May 24, 2006 01:14
Difficult BCs about Freesurface Simulation by VOF Yongguang Cheng FLUENT 0 September 19, 2003 07:39
FreeSurface simulation Chengxuan Fu CD-adapco 0 January 27, 2001 07:08


All times are GMT -4. The time now is 05:31.