Statistics – Computation
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...70..419h&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 70, June 1989, p. 419-446. Research supported by the San Diego Su
Statistics
Computation
670
Computational Fluid Dynamics, Computerized Simulation, Data Smoothing, Magnetohydrodynamics, Trees (Mathematics), Dynamical Systems, Many Body Problem, Monte Carlo Method, Spatial Resolution
Scientific paper
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.
Hernquist Lars
Katz Neal
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