Numerical observation of secondary Mach stem in weak acoustic shock reflection

Recently Ram, Geva, and Sadot [J. Fluid Mech. 768, 219–235 (2015)] showed, experimentally, the formation of a secondary Mach stem generated from the reflection of the primary Mach stem in the aerodynamic regime. Such a phenomenon has never been observed, either experimentally or numerically, in the...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2018-08, Vol.144 (2), p.EL125-EL130
Main Authors: Tripathi, Bharat B., Baskar, Sambandam, Coulouvrat, François, Marchiano, Régis
Format: Article
Language:English
Subjects:
Acoustics
Engineering Sciences
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Summary:Recently Ram, Geva, and Sadot [J. Fluid Mech. 768, 219–235 (2015)] showed, experimentally, the formation of a secondary Mach stem generated from the reflection of the primary Mach stem in the aerodynamic regime. Such a phenomenon has never been observed, either experimentally or numerically, in the framework of weak acoustic shocks. In this work, the formation of a secondary Mach stem is observed from the reflection of acoustic shock waves on a convex-concave boundary giving rise to a complex five-shock pattern. This study is fully numerical and is based on the numerical solution of a nonlinear acoustic system of equations using a recently developed discontinuous Galerkin solver.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.5050667