CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Modeling Free Surface Flows

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 11, 1998, 09:46
Default Modeling Free Surface Flows
  #1
Elliot Schwartz
Guest
 
Posts: n/a
Does anyone know of any journal articles or survey papers addressing the topic of CFD modeling of free surface flows? I am interested in the use of commercial codes and any comparisons of their performance and accuracy under various conditions, but any references on free surface flows would be useful. In particular, I am interested in low-Reynolds number free surface flows, but again, any references on CFD analysis of free surface flows would be useful.

Thanks in advance for any help and thanks to Jonas Larsson for providing this forum.

Elliot Schwartz
  Reply With Quote

Old   August 11, 1998, 10:54
Default Re: Modeling Free Surface Flows
  #2
Jonas Larsson
Guest
 
Posts: n/a
Flow Science Inc. has a lot of info on free-surface simulations available online. You can find their homepage at:

http://www.flow3d.com/

However, this is a commercial site and you won't get a very objective picture I'm afraid, but it's better than nothing. Btw, I'm glad you like this forum.
  Reply With Quote

Old   August 11, 1998, 11:19
Default Re: Modeling Free Surface Flows
  #3
Philip Zwart
Guest
 
Posts: n/a
There are several different approaches to modelling free surface flows, and more than one way to classify them. I like the terminology "interface-tracking" and "interface-capturing". The following paper describes methods in both categories:

@InCollection{MuzPer98, author = {S. Muzaferija and M. Peri\'{c}}, title = {Computation of free-surface flows using interface-tracking

and interface-capturing methods}, booktitle = {Nonlinear Water Wave Interaction}, editor = {O. Mahrenholtz and M Markiewicz}, publisher = {Computational Mechanics Publications}, year = 1998 }

and it also has references to earlier fundamental papers.

Interface-tracking means the computational mesh adapts the the free surface at all times. This works well provided the boundary motion is not too complex. For my Ph.D., I'm developing a method of this type for 2d flows which works for (fairly) arbitrary motions provided there is no colliding of interfaces.

Interface-capturing means the surface is captured by solving auxiliary equations (such as the fluid volume) over a domain which encompasses the interface. These methods are more general in that they can handle colliding interfaces. But a lot of things need to be done right in order to get a sharp interface. The Flow Science web page which Jonas mentioned has some impressive pictures of complex motions.

Hope this helps,

phil
  Reply With Quote

Old   August 11, 1998, 13:22
Default Re: Modeling Free Surface Flows
  #4
R Sukumar
Guest
 
Posts: n/a
CFD-ACE+ from CFD Research Corporation has a VOF free surface capability. Some preliminary information focussed on plastic encapsulation of electronic components is available on Plastic Encapsulation.

More comprehensive information will be published soon.

R. Sukumar CFD Research Corporation
  Reply With Quote

Old   August 13, 1998, 09:39
Default Re: Modeling Free Surface Flows
  #5
Elliot Schwartz
Guest
 
Posts: n/a
Thanks to Jonas, Philip, and Mr. Sukumar for your quick responses. They provided much useful information.

Elliot Schwartz
  Reply With Quote

Old   August 25, 1998, 22:03
Default Re: Modeling Free Surface Flows
  #6
Sung-Eun Kim
Guest
 
Posts: n/a
We've been employing the so-called "volume-Of-Fluid" method in our software (FLUENT 4.4 and FLUENT 5.0) which is a fixed grid method (structured and unstructured mesh)for tracking free surface. And in Fidap, one of our CFD products, we have employed a Arbitrary Lagrangian-Eulerian (ALE) based free-surface tracking scheme.

The two approaches (fixed grid and ALE) have advantages and disadvantages. For free surface with large deformation (e.g. wave-breaking, liquid sloshing in tanks), the fixed grid method might be the choice, for instance.

I hope you don't think I'm making a sales pitch.

Good Luck, Sung-Eun
  Reply With Quote

Reply

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
Numerical schemes for free surface flows (VOF) botp OpenFOAM 2 March 11, 2011 16:27
Free Surface Modell & stratfied Flows Zaktatir CFX 2 January 11, 2010 12:24
Hydrofoil modeling near free surface in fluent Mojtaba Lajevardi FLUENT 2 June 7, 2008 05:59
Free surface modeling Bruce CFX 4 July 19, 2007 16:00
Modeling of free surface flow sam FLUENT 2 October 29, 2003 11:39


All times are GMT -4. The time now is 01:21.