Stable marker-particle method for the Voronoi diagram in a flow field

  • Authors:
  • Tetsushi Nishida;Kokichi Sugihara;Masato Kimura

  • Affiliations:
  • Department of Mathematical Informatics, University of Tokyo, Japan;Department of Mathematical Informatics, University of Tokyo, Japan;Faculty of Mathematics, Kyushu University, Japan

  • Venue:
  • Journal of Computational and Applied Mathematics
  • Year:
  • 2007

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Abstract

The Voronoi diagram in a flow field is a tessellation of water surface into regions according to the nearest island in the sense of a ''boat-sail distance'', which is a mathematical model of the shortest time for a boat to move from one point to another against the flow of water. The computation of the diagram is not easy, because the equi-distance curves have singularities. To overcome the difficulty, this paper derives a new system of equations that describes the motion of a particle along the shortest path starting at a given point on the boundary of an island, and thus gives a new variant of the marker-particle method. In the proposed method, each particle can be traced independently, and hence the computation can be done stably even though the equi-distance curves have singular points.