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Hirt's VOF isn't PLIC?

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Old   September 20, 2001, 06:05
Default Hirt's VOF isn't PLIC?
  #1
Zi-Wei Chiou
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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.
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Old   September 20, 2001, 11:29
Default Re: Hirt's VOF isn't PLIC?
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Mr Unsure
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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.
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Old   September 20, 2001, 13:45
Default Re: Hirt's VOF isn't PLIC?
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Mr. Cynical
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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.
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Old   September 20, 2001, 14:04
Default Re: Hirt's VOF isn't PLIC?
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John C. Chien
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(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.
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