Abstract
The interaction of a shock wave with quasi-vortical isotropic turbulence (IT) represents a basic problem for studying some of the phenomena associated with high speed flows, such as hypersonic flight, supersonic combustion and Inertial Confinement Fusion (ICF). In general, in practical applications, the shock width is much smaller than the turbulence scales and the upstream turbulent Mach number is modest. In this case, recent high resolution shock-resolved Direct Numerical Simulations (DNS) (Ryu and Livescu, J Fluid Mech 756:R1, 2014) show that the interaction can be described by the Linear Interaction Approximation (LIA). Using LIA to alleviate the need to resolve the shock, DNS post-shock data can be generated at much higher Reynolds numbers than previously possible. Here, such results with Taylor Reynolds number approximately 180 are used to investigate the changes in the vortical structure as a function of the shock Mach number, \(M_{s}\), up to \(M_{s}=10\). It is shown that, as \(M_{s}\) increases, the shock interaction induces a tendency towards a local axisymmetric state perpendicular to the shock front, which has a profound influence on the vortex-stretching mechanism and divergence of the Lamb vector and, ultimately, on the flow evolution away from the shock.
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Acknowledgments
Los Alamos National Laboratory is operated by Los Alamos National Security, LLC for the US Department of Energy NNSA under Contract No. DE-AC52-06NA25396. Computational resources were provided by the LANL Institutional Computing (IC) Program and Sequoia Capability Computing Campaign at Lawrence Livermore National Laboratory.
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Communicated by A. Podlaskin.
This paper is based on work that was presented at the 21st International Symposium on Shock Interaction, Riga, Latvia, August 3–8, 2014.
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Livescu, D., Ryu, J. Vorticity dynamics after the shock–turbulence interaction. Shock Waves 26, 241–251 (2016). https://doi.org/10.1007/s00193-015-0580-5
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DOI: https://doi.org/10.1007/s00193-015-0580-5