An adaptive particle-mesh gravity solver for ENZO

Abstract

We describe and implement an adaptive particle-mesh algorithm to solve the Poisson equation for grid-based hydrodynamics codes with nested grids. The algorithm is implemented and extensively tested within the astrophysical code Enzo against the multigrid solver available by default. We find that while both algorithms show similar accuracy for smooth mass distributions, the adaptive particle-mesh algorithm is more accurate for the case of point masses, and is generally less noisy. We also demonstrate that the two-body problem can be solved accurately in a configuration with nested grids. In addition, we discuss the effect of subcycling, and demonstrate that evolving all the levels with the same timestep yields even greater precision.

10 pages, 7 figures, accepted for publication in ApJ Supplement

References in corpus (6)

• A Multi-Code Analysis Toolkit for Astrophysical Simulation Data
• Enzo: An Adaptive Mesh Refinement Code for Astrophysics
• Adaptive Refinement Tree - a new high-resolution N-body code for cosmological simulations
• MLAPM - a C code for cosmological simulations
• A Direct Multigrid Poisson Solver for Oct-Tree Adaptive Meshes
• An Adaptive Multigrid Solver for High-Resolution Cosmological Simulations

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