Fast and accurate Voronoi density gridding from Lagrangian hydrodynamics data

Maya A. Petkova, Guillaume Laibe, Ian A. Bonnell

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
1 Downloads (Pure)

Abstract

Voronoi grids have been successfully used to represent density structures of gas in astronomical hydrodynamics simulations. While some codes are explicitly built around using a Voronoi grid, others, such as Smoothed Particle Hydrodynamics (SPH), use particle-based representations and can benefit from constructing a Voronoi grid for post-processing their output. So far, calculating the density of each Voronoi cell from SPH data has been done numerically, which is both slow and potentially inaccurate. This paper proposes an alternative analytic method, which is fast and accurate. We derive an expression for the integral of a cubic spline kernel over the volume of a Voronoi cell and link it to the density of the cell. Mass conservation is ensured rigorously by the procedure. The method can be applied more broadly to integrate a spherically symmetric polynomial function over the volume of a random polyhedron.
Original languageEnglish
Pages (from-to)300-315
JournalJournal of Computational Physics
Volume353
Early online date20 Oct 2017
DOIs
Publication statusPublished - 15 Jan 2018

Keywords

  • Voronoi grid
  • SPH kernel
  • Density structure

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