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

Hirt's VOF isn't PLIC?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 20, 2001, 06:05
Default Hirt's VOF isn't PLIC?
  #1
Zi-Wei Chiou
Guest
 
Posts: n/a
In a review technical report[1], it said the Hirt and Nicholos's alogrithm[2] for interface reconstruction is "piecewise constant/stair-step":

Page 6: "Piecewise constant/stair-step VOF methods followed shortly after SLIC, the most notable being Hirt and Nichols (HN) [2] (who coined the term 'volume-of-fluid')...In these methods, interfaces are also forced to align with mesh coordinates, but are additionally allowed to 'stair-step' within each cell, or align with more than one mesh coordinate within a given cell, depending upon the local volume fraction data distribution."

But when I look up [2], I found it's actually a PLIC (Piecewise Linear Interface Construction) algorithm:

Subsection D.3 Determing Interfaces Within a Cell: "...In the VOF technique, it's assumed that the boundary can be approximated by a straight line currint through the cell. By first determining the slope of this line, it can be moved across the cell to a position that intersects the known amount of fluid volume in the cell."

What's wrong?

Bibliography:

[1] Kothe, D.B; Rider, W.J., Comments on Modeling Interfacial Flows with Volume-of-Fluid Methods, Los Alamos National Lab, Feb 1995.

[2] Hirt,C.W; Nichols,B.D, Volume of Fluid (VOF) Method for the Dynamics of Free Boundaries, J.Comp.Phys., Vol.39, pp.201--225, 1981.
  Reply With Quote

Old   September 20, 2001, 11:29
Default Re: Hirt's VOF isn't PLIC?
  #2
Mr Unsure
Guest
 
Posts: n/a
I have limited knowledge of SLIC techniques but I believe the slope was found but only used to distiguish the case between horizontal and vertical cases.
  Reply With Quote

Old   September 20, 2001, 13:45
Default Re: Hirt's VOF isn't PLIC?
  #3
Mr. Cynical
Guest
 
Posts: n/a
What's wrong? Don't believe everything you read, especially when one author is describing what another author did. Go to the original sources and find out for yourself.
  Reply With Quote

Old   September 20, 2001, 14:04
Default Re: Hirt's VOF isn't PLIC?
  #4
John C. Chien
Guest
 
Posts: n/a
(1). Why not try to locate both authors first, and then try to get their opinion. (2). We can't tell you what is right or what is wrong.
  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
Question:Considerations about the evaporation in VOF dokeun FLUENT 10 February 24, 2011 21:47
question about Heat transfer between two phases with VOF model sooroo3 FLUENT 0 February 15, 2011 04:24
slop in Hirt's VOF method GCM Main CFD Forum 0 July 28, 2009 16:44
Difficult BCs about Freesurface Simulation by VOF Yongguang Cheng FLUENT 0 September 19, 2003 08:39
Hirt's VOF algorithm for free surface flow Anthony Main CFD Forum 10 April 19, 1999 11:38


All times are GMT -4. The time now is 07:47.