Equation of State Scalings in Kull

Ulitsky, M S ; Zimmerman, G ; Renard, P ; Tang, N A

Lawrence Livermore National Laboratory

关键词: Nuclear Reactions;    Lawrence Livermore National Laboratory;    Physics;    71 Classical And Quantumm Mechanics, General Physics;   

DOI  :  10.2172/923987
RP-ID  :  UCRL-TR-237220
RP-ID  :  W-7405-ENG-48
RP-ID  :  923987

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来源: UNT Digital Library

【 摘 要 】

In this short report, we consider two types of equation of state (EOS) scalings, which will be referred to as type I (or density scaling) and type II (or Thomas-Fermi scaling). EOS scalings are used to correct for the fact that EOS tables are constructed with a fixed isotopic composition. Even if the isotopics in a computational zone are evolving through chemical or nuclear reactions, the EOS lookups for pressure and energy (and their derivatives with respect to density and temperature) aren't normally cognizant of this fact. The EOS scalings are an attempt to fix this shortcoming. They typically modify the incoming density and/or temperature based on ratios of isotopic quantities (like {sub table}/{sub zone}, {sub table}/{sub zone}), and then modify the table lookup values. In this way, the EOS can dynamically respond to the changing isotopics.