Cosmological smoothed particle hydrodynamics simulations: the entropy equation

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ID: 303703
2002
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Ranked #647 of 908 articles by views in monthly notices of the royal astronomical society

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Abstract
We discuss differences in simulation results that arise between the use of either the thermal energy or the entropy as an independent variable in smoothed particle hydrodynamics (SPH). In this context, we derive a new version of SPH that, when appropriate, manifestly conserves both energy and entropy if smoothing lengths are allowed to adapt freely to the local mass resolution. To test various formulations of SPH, we consider point-like energy injection, as in certain models of supernova feedback, and find that powerful explosions are well represented by SPH even when the energy is deposited into a single particle, provided that the entropy equation is integrated. If the thermal energy is instead used as an independent variable, unphysical solutions can be obtained for this problem.
Reference Key
openalex_W2128808878 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Volker Springel, Lars Hernquist
Journal monthly notices of the royal astronomical society
Year 2002
DOI
10.1046/j.1365-8711.2002.05445.x
URL
https://academic.oup.com/mnras/article-pdf/333/3/649/3222513/333-3-649.pdf
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