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Effects of distributed pressure gradients on the pressure–strain correlations in a supersonic nozzle and diffuser

Published online by Cambridge University Press:  21 February 2014

Somnath Ghosh  and
Rainer Friedrich
Somnath Ghosh
Affiliation:
Lehrstuhl für Aerodynamik und Strömungsmechanik, TU München, D-85748 Garching bei München, Germany
Rainer Friedrich*
Affiliation:
Lehrstuhl für Aerodynamik und Strömungsmechanik, TU München, D-85748 Garching bei München, Germany
*
†Email address for correspondence: [email protected]
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Abstract

Direct numerical simulation (DNS), based on high-order numerical schemes, is used to study the effects of distributed pressure gradients on the redistribution of fluctuating kinetic energy in supersonic nozzle and diffuser flow with incoming fully developed turbulent pipe flow. Axisymmetric geometries and flow parameters have been selected such that shock waves are avoided and streamline curvature remains unimportant. Although mean extra rates of strain are quite small, strong changes in Reynolds stresses and their production/redistribution mechanisms are observed, in agreement with findings of Bradshaw (J. Fluid Mech., vol. 63, 1974, pp. 449–464). The central role of pressure–strain correlations in changing the Reynolds stress anisotropy is highlighted. A Green’s function-based analysis of pressure–strain correlations is presented, showing remarkable agreement with DNS data.

JFM classification

Turbulent Flows: Compressible turbulence Turbulent Flows: Shear layer turbulence Turbulent Flows: Turbulence simulation
Type
Papers
Information
Journal of Fluid Mechanics , Volume 742 , 10 March 2014 , pp. 466 - 494
Copyright
© 2014 Cambridge University Press 

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