Influence of Thermophysical Properties Extrapolation, in the Course of Iterative Calculations, on the Convergence Pattern of a Simulation Algorithm—A General Analysis

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Stefan G. Tsvetkov¹  Roumiana P. Stateva¹ 

[1] Institute of Chemical Engineering Bulgarian Academy of Sciences Acad.

关键词: Process Simulation;    Algorithm Convergence;    Thermophysical Properties;    Contraction Mapping Principle;   

DOI  :  10.1252/jcej.25.327

来源: Maruzen Company Ltd

【 摘 要 】

References(15)Cited-By(1)An extrapolating model provides values for the thermophysical properties when infeasible specifications (either pressure or temperature) are recognized at a given iteration in a process simulator, applying an EOS technique. The model has a considerable effect on the convergence characteristics, accuracy and robustness of a higher-level simulation algorithm.The present paper outlines a general approach for evaluating and comparing the abilities of different extrapolation techniques: to promote the convergence of higher-level algorithms; to ensure for them a solution that is accurate and not significantly inferior to the actual one. The latter could have been obtained using for example a different thermodynamic model.The approach is based on the classical fixed-point theory and its connection with the contraction-mapping principle.

【 授权许可】

Unknown