Regularization of the retrospective diffusion problem and of the nonhyperbolic system of equations of barotropic two-phase flow

1994 ◽  
Vol 28 (6) ◽  
pp. 785-789
Author(s):  
F. A. Krivoshei
Keyword(s):  
Two Phase Flow ◽  
Diffusion Problem ◽  
System Of Equations ◽  
Phase Flow ◽  
Two Phase

Application of AUSM Schemes to Multi-Dimensional Two-Phase Flow Problems

2003 ◽  
Author(s):  
Jose´ R. Garci´a-Cascales ◽  
Henri Paille`re
Keyword(s):  
Experimental Data ◽  
Phase Change ◽  
Numerical Method ◽  
Two Phase Flow ◽  
Equations Of State ◽  
System Of Equations ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Problems ◽  
Future Work

In this paper we study the extension of AUSM schemes to multi-dimensional two-phase flow problems with phase change. We present the system of equations characterizing these problems, the closure relationships and the equations of state to close the system. We present some of the most important characteristics of the numerical method used in this work, discribing how primitive variables are determined from conserved variables. Numerical results, corresponding to a fast depressurization benchmark, are included and compared with some experimental data. Conclusions are then drawn and future work briefly described.

Two-Phase Flow Interior Ballistics Model of Naval Large Caliber Guided Projectile Gun System

2013 ◽  
Vol 465-466 ◽  
pp. 592-596
Author(s):  
Mahmoud M. Rashad ◽  
Xiao Bing Zhang ◽  
Hazem El Sadek ◽  
Cheng Cheng
Keyword(s):  
Flow Model ◽  
Moving Boundary ◽  
Two Phase Flow ◽  
Control Volume ◽  
Numerical Code ◽  
System Of Equations ◽  
Phase Flow ◽  
Computational Domain ◽  
Two Phase ◽  
Interior Ballistics

The two-phase flow mathematical model for the solid granular propellant and its products of combustion inside large caliber naval gun guided projectile system (NGGPS) during interior ballistic cycle is presented. The model includes the governing equations of mass, momentum and energy for both phases as well as the constitutive laws. The discharged combustion products from the igniter vent-holes into the chamber are acquired by incorporation in the model the two-phase flow model of the bayonet igniter. The system of equations of the two-phase flow model is solved using the second order accurate Maccromacks technique. A one dimensional model introduced by G.A. Sod (shock tube) is utilized to test the ability of Maccromacks algorithm in solving the initial boundary value problem (IBVP) for the system of equations with shock wave behavior. The numerical method is verified by using an exact solution of a test problem. The moving control volume conservation method (MCVC) is used to handle the moving boundary as well as a self-adapting method was used to expand the computational domain in order to follow the movement of the projectile down the gun bore. The numerical results are validated with experimental data. The interior ballistics performance of a 130 mm naval guided projectile gun system is closely predicted using the presented two-phase flow model and the numerical code.

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