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Title: TREESPH - A unification of SPH with the hierarchical tree method. [Smoothed Particle Hydrodynamics]

Abstract

A new, general-purpose code for evolving three-dimensional, self-gravitating fluids in astrophyics, both with and without collisionless matter, is described. In this TREESPH code, hydrodynamic properties are determined using a Monte Carlo-like approach known as smoothed particle hydrodynamics (SPH). Unlike most previous implementations of SPH, gravitational forces are computed with a hierarchical tree algorithm. Multiple expansions are used to approximate the potential of distant groups of particles, reducing the cost per step. More significantly, the improvement in efficiency is achieved without the introduction of a grid. A unification of SPH with the hierarchical tree method is a natural way of allowing for larger N within a Lagrangian framework. The data structures used to manipulate the grouping of particles can be applied directly to certain aspects of the SPH calculation. 75 refs.

Authors:
;  [1]
  1. Institute for Advanced Study, Princeton, NJ (USA)
Publication Date:
OSTI Identifier:
5583184
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal, Supplement Series; (USA)
Additional Journal Information:
Journal Volume: 70; Journal ID: ISSN 0067-0049
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; ASTROPHYSICS; HYDRODYNAMICS; T CODES; COMPUTERIZED SIMULATION; FLUID MECHANICS; MAGNETOHYDRODYNAMICS; MANY-BODY PROBLEM; MATHEMATICS; MONTE CARLO METHOD; SPATIAL RESOLUTION; THREE-DIMENSIONAL CALCULATIONS; COMPUTER CODES; MECHANICS; RESOLUTION; SIMULATION; 640100* - Astrophysics & Cosmology; 990220 - Computers, Computerized Models, & Computer Programs- (1987-1989)

Citation Formats

Hernquist, L, Katz, N, and Princeton Univ. Observatory, NJ. TREESPH - A unification of SPH with the hierarchical tree method. [Smoothed Particle Hydrodynamics]. United States: N. p., 1989. Web. doi:10.1086/191344.
Hernquist, L, Katz, N, & Princeton Univ. Observatory, NJ. TREESPH - A unification of SPH with the hierarchical tree method. [Smoothed Particle Hydrodynamics]. United States. https://doi.org/10.1086/191344
Hernquist, L, Katz, N, and Princeton Univ. Observatory, NJ. 1989. "TREESPH - A unification of SPH with the hierarchical tree method. [Smoothed Particle Hydrodynamics]". United States. https://doi.org/10.1086/191344.
@article{osti_5583184,
title = {TREESPH - A unification of SPH with the hierarchical tree method. [Smoothed Particle Hydrodynamics]},
author = {Hernquist, L and Katz, N and Princeton Univ. Observatory, NJ},
abstractNote = {A new, general-purpose code for evolving three-dimensional, self-gravitating fluids in astrophyics, both with and without collisionless matter, is described. In this TREESPH code, hydrodynamic properties are determined using a Monte Carlo-like approach known as smoothed particle hydrodynamics (SPH). Unlike most previous implementations of SPH, gravitational forces are computed with a hierarchical tree algorithm. Multiple expansions are used to approximate the potential of distant groups of particles, reducing the cost per step. More significantly, the improvement in efficiency is achieved without the introduction of a grid. A unification of SPH with the hierarchical tree method is a natural way of allowing for larger N within a Lagrangian framework. The data structures used to manipulate the grouping of particles can be applied directly to certain aspects of the SPH calculation. 75 refs.},
doi = {10.1086/191344},
url = {https://www.osti.gov/biblio/5583184}, journal = {Astrophysical Journal, Supplement Series; (USA)},
issn = {0067-0049},
number = ,
volume = 70,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 1989},
month = {Thu Jun 01 00:00:00 EDT 1989}
}