Wall shear stress and wall heat flux in a supersonic turbulent boundary layer subjected to concave surface curvature

Abstract

Compressible turbulent boundary layers over concave surface curvature are of major interest in the design of high-speed aircraft and propulsion systems. In this work, we investigate the effect of longitudinal concave surface curvature on the statistical and structural properties of the fluctuating wall shear stress and wall heat flux, including probability density function, space-time correlations, and frequency spectra. We also quantitatively demonstrate that the significantly energized outer large-scale structures make an increasingly important contribution to the mean wall shear stress and wall heat flux generation.

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