Direct numerical simulations of canonical shock/turbulence interaction

By Johan Larsson, Sanjiva K. Lele. Proceeding of Sixth International Symposium on Turbulence and Shear Flow Phenomena, 2008

254 citations recorded by the source corpus.

A set of direct numerical simulations of isotropic turbulence passing through a nominally normal shock wave is presented. Upstream of the shock, the microscale Reynolds number is 40, the mean Mach number is 1.3–6.0, and the turbulence Mach number is 0.16–0.38. It is shown that the Kolmogorov scale decreases during the shock interaction, which implies that the grid resolution needed to resolve the viscous dissipation is finer than that used in previous studies. This leads to some qualitative differences with previous work, e.g., a rapid increase in the streamwise vorticity variance behind the shock and large anisotropy of the postshock Reynolds stresses. The instantaneous structure of the shock/turbulence interaction is examined using averages conditioned on the instantaneous shock strength. For locally strong compressions, the flow is characterized by overcompression, followed by an expansion. At points where the shock is locally weak, the profiles differ qualitatively depending on the strength of the inc...

Subfields: Atmospheric Science, Computational Mechanics

View Paper: https://www.semanticscholar.org/paper/42a5efa06794514c74eb2258d8080433827d9d35

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Citations in the corpus

Confinement effects in shock wave/turbulent boundary layer interactions through wall-modelled large-eddy simulations (2014, background): “These peaks are the result of the amplification of turbulence experienced across the shock (see Larsson & Lele 2009).”
Reynolds- and Mach-number effects in canonical shock–turbulence interaction (2013, methodology): “In the DNS of Larsson & Lele (2009), the small scales where viscous dissipation occurs were shown to decrease significantly in size during the interaction with the shock, implying that the resolution requirements behind the shock are substantially finer than before it.”