Journal of Scientific Computing

, Volume 75, Issue 2, pp 993–1015 | Cite as

Unconditionally Energy Stable Linear Schemes for the Diffuse Interface Model with Peng–Robinson Equation of State

  • Hongwei Li
  • Lili Ju
  • Chenfei Zhang
  • Qiujin Peng


In this paper, we investigate numerical solution of the diffuse interface model with Peng–Robinson equation of state, that describes real states of hydrocarbon fluids in the petroleum industry. Due to the strong nonlinearity of the source terms in this model, how to design appropriate time discretizations to preserve the energy dissipation law of the system at the discrete level is a major challenge. Based on the “Invariant Energy Quadratization” approach and the penalty formulation, we develop efficient first and second order time stepping schemes for solving the single-component two-phase fluid problem. In both schemes the resulted temporal semi-discretizations lead to linear systems with symmetric positive definite spatial operators at each time step. We rigorously prove their unconditional energy stabilities in the time discrete sense. Various numerical simulations in 2D and 3D spaces are also presented to validate accuracy and stability of the proposed linear schemes and to investigate physical reliability of the target model by comparisons with laboratory data.


Diffuse interface Linear scheme Peng–Robinson equation of state Invariant energy quadratization Energy stability Penalty formulation 

Mathematics Subject Classification

65N30 65N50 49S05 


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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.School of Mathematics and StatisticsShandong Normal UniversityJinanChina
  2. 2.Department of MathematicsUniversity of South CarolinaColumbiaUSA
  3. 3.Institute for Mathematical SciencesRenmin University of ChinaBeijingChina

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