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

Journal Article · Thu Jun 01 00:00:00 EDT 1989 · Astrophysical Journal, Supplement Series; (USA)

DOI:https://doi.org/10.1086/191344· OSTI ID:5583184

Hernquist, L; Katz, N ^[1]

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1. Institute for Advanced Study, Princeton, NJ (USA)

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.

• OSTI ID: 5583184
• Journal Information: Astrophysical Journal, Supplement Series; (USA), Vol. 70; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

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)