Direct and Large-Eddy Simulation II pp 167-178 | Cite as

# Pressure and Dilatation Effects in High-Speed Turbulence

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## Abstract

This paper examines the pressure and dilatation effects in high-speed turbulence on the basis of direct numerical simulation (DNS) databases of three-dimensional compressible mixing layers at convective Mach numbers *M* _{ c } = 0.8, 1.1 and 1.2. Fluctuating pressure effects are found to be significant for local turbulence energy balance and scalar transport. However, due to its acoustic nature, fluctuating pressure is mainly responsible for energy redistribution rather than energy creation or destruction. Models for velocity- and scalar-pressure gradients are developed and tested, which give satisfactory agreement with DNS data. Eddy shocklets are observed at *M* _{ c } = 1.1 and above. Their effects are spatially and temporally localized but have been substantially over-predicted by all existing models.

## Keywords

Mach Number Direct Numerical Simulation Premix Flame Pressure Work Direct Numerical Simulation Data## Preview

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