Acta mathematica scientia,Series A ›› 2025, Vol. 45 ›› Issue (2): 371-388.

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The Vanishing Pressure Limit of Riemann Solutions for a Class of Two-Phase Flow Models with Non-Isentropic Dusty Gases

Jin Daiguang,He Shaohong(),Wu Yuyan,Jiang Weifeng*()   

  1. Faculty of Science, China Jiliang University, Hangzhou 310018
  • Received:2024-11-05 Revised:2025-01-26 Online:2025-04-26 Published:2025-04-09
  • Contact: Weifeng Jiang E-mail:s22080701004@cjlu.edu.cn;casujiang89@cjlu.edu.cn
  • Supported by:
    NSFC(1240012056)

Abstract:

This paper studies the cavitation and concentration phenomena of the Riemann solutions for a reduced two-phase mixtures model with non-isentropic dusty gas state as the pressure vanishes. Firstly, we construct the Riemann entropy solutions by characteristic analysis method in $ (p, u, s) $ coordinate system. Secondly, we conclude that, the pressureless limit of Riemann solutions for the reduced two-phase mixtures model is just the Riemann solutions for the reduced 2-dimensional pressureless gas dynamics model. Finally, we present numerical simulations which are consistent with our theoretical analysis.

Key words: non-isentropic, two-phase mixtures model, pressureless limit, Riemann problem, Delta shock wave, vacuum state

CLC Number: 

  • O175.23
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