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Titolo:
The accuracy, consistency, and speed of five equations of state for stellar hydrodynamics
Autore:
Timmes, FX; Arnett, D;
Indirizzi:
Univ Chicago, Ctr Astrophys Thermonucl Flashes, Chicago, IL 60637 USA UnivChicago Chicago IL USA 60637 ermonucl Flashes, Chicago, IL 60637 USA Univ Arizona, Steward Observ, Tucson, AZ 85721 USA Univ Arizona Tucson AZUSA 85721 na, Steward Observ, Tucson, AZ 85721 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
fascicolo: 1, volume: 125, anno: 1999,
pagine: 277 - 294
SICI:
0067-0049(199911)125:1<277:TACASO>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
FERMI;
Keywords:
equation of state; hydrodynamics; methods : numerical; stars : general; stars : interiors;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Timmes, FX Univ Chicago, Ctr Astrophys Thermonucl Flashes, Chicago, IL 60637 USA Univ Chicago Chicago IL USA 60637 ashes, Chicago, IL 60637 USA
Citazione:
F.X. Timmes e D. Arnett, "The accuracy, consistency, and speed of five equations of state for stellar hydrodynamics", ASTROPH J S, 125(1), 1999, pp. 277-294

Abstract

We compare the thermodynamic properties and execution speed of five independent equations of state. A wide range of temperatures, densities, and compositions are considered-conditions appropriate for modeling the collapse ofa cloud of hydrogen gas (or an exploding supernova) to the outer layers ofa neutron star. The pressures and specific thermal energies calculated by each equation-of-state routine are reasonably accurate (typically 0.1% error or less) and agree remarkably well with each other, despite the differentapproaches and approximations used in each routine. The derivatives of thepressure and specific thermal energies with respect to the temperature anddensity generally show less accuracy (typically 1% error or less) and moredisagreement with one another. Thermodynamic consistency, as measured by deviations from the appropriate Maxwell relations, shows that the Timmes equation of state and the Nadyozhin equation of state achieve thermodynamic consistency to a high degree of precision. The execution speed of the five equation-of-state routines-evaluated across several different machine architectures, compiler options, and modes of operation-differ dramatically. The Arnett equation of state is the fastest of the five routines, with the Nadyozhin equation of state close behind.

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Documento generato il 26/11/20 alle ore 09:02:30