CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2019, Vol. 36 ›› Issue (3): 259-264.DOI: 10.19596/j.cnki.1001-246x.7853

Special Issue: 高压物态方程研究

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Application of Simulated Annealing Method in Chemical Free Energy Model

LI Qiong, LIU Haifeng, ZHANG Gongmu, ZHANG Qili   

  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
  • Received:2018-03-09 Revised:2018-03-28 Online:2019-05-25 Published:2019-05-25

Abstract: Application of simulated annealing method in chemical free energy model to search for chemical composition of equilibrium state is proposed. Due to the random "thermal" fluctuations introduced by simulated annealing method, the difficulty associated with sensitivity of result to initial values is removed. Moreover, in the regime of first order phase transition where stable state and meta-stable state coexist, the stable state can always be obtained. As an example, chemical free energy model improved by simulated annealing method is applied to the equation of state for fluid helium, which demonstrates the plasma phase transition induced by pressure ionization.

Key words: simulated annealing method, chemical free energy model, plasma phase transition

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