# Hirt's VOF isn't PLIC?

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 September 20, 2001, 05:05 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.

 September 20, 2001, 10:29 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.

 September 20, 2001, 12:45 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.

 September 20, 2001, 13:04 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.

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