Title: High-Resolution Numerical Simulation and Analysis of Mach Reflection Structures in Detonation Waves in Low-Pressure H ₂ –O ₂ –Ar Mixtures: A Summary of Results Obtained with the Adaptive Mesh Refinement Framework AMROC

Abstract

Numerical simulation can be key to the understanding of the multidimensional nature of transient detonation waves. However, the accurate approximation of realistic detonations is demanding as a wide range of scales needs to be resolved. This paper describes a successful solution strategy that utilizes logically rectangular dynamically adaptive meshes. The hydrodynamic transport scheme and the treatment of the nonequilibrium reaction terms are sketched. A ghost fluid approach is integrated into the method to allow for embedded geometrically complex boundaries. Large-scale parallel simulations of unstable detonation structures of Chapman-Jouguet detonations in low-pressure hydrogen-oxygen-argon mixtures demonstrate the efficiency of the described techniques in practice. In particular, computations of regular cellular structures in two and three space dimensions and their development under transient conditions, that is, under diffraction and for propagation through bends are presented. Some of the observed patterns are classified by shock polar analysis, and a diagram of the transition boundaries between possible Mach reflection structures is constructed.

Authors:

Deiterding, Ralf ^[1]

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+ Show Author Affiliations

1. Computer Science and Mathematics, Oak Ridge National Laboratory, P.O. Box 2008 MS-6367, Oak Ridge, TN 37831, USA

Publication Date:

Sat Jan 01 00:00:00 EST 2011

Sponsoring Org.:

USDOE

OSTI Identifier:

1198442

Grant/Contract Number:  

1097055; W-7405-ENG-48

Resource Type:

Published Article

Journal Name:

Journal of Combustion

Additional Journal Information:

Journal Name: Journal of Combustion Journal Volume: 2011; Journal ID: ISSN 2090-1968

Publisher:

Hindawi Publishing Corporation

Country of Publication:

Egypt

Language:

English