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Turbulent closure analysis in heated separated and reattached flow using eddy-resolving data

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posted on 29.04.2020, 13:59 by Christopher EllisChristopher Ellis, Hao XiaHao Xia
In this study, we use Large-Eddy Simulations (LESs) to provide a platform to investigate the separated and reattached turbulent flow over a heated blunt plate at ReH = 21 600. The surface Nusselt number and flow field data show good agreement with the published experiments. The turbulence anisotropy resolved by the LES shows that, through the recirculation region, the anisotropy develops toward an axisymmetric contraction state in the near-wall profile. In the redeveloping region, profiles show progression toward the plane-strain state. Turbulent closures, providing simple models of the unknown turbulent correlations that arise from the Reynolds averaging of the Navier–Stokes equations, are routinely applied to complex flows, often with little known about their suitability. The eddy-resolved flow field is used to describe deficiencies in Reynolds-Averaged Navier–Stokes modeling using an LES informed turbulence transport a priori analysis. The explicit algebraic Reynolds stress model showed improved agreement, capturing the elevated turbulent stresses in the recirculation region. Closures describing the turbulent heat flux are compared, and the Higher-Order Generalized GDH (HOGGDH) closure is discovered to show good agreement with those resolved by the LES, capturing the correct ratio of the streamwise to normal turbulent heat flux across the redeveloping boundary layer. An explicit algebraic scalar flux model is examined and shows good predictions of the turbulent heat flux angle but underpredicts the magnitude across the recirculation region. An optimal coefficient for the HOGGDH is described to reproduce the turbulent heat flux magnitude from the LES, showing a range of optimal values across the flow.

Funding

EPSRC Centre for Doctoral Training in Gas Turbine Aerodynamics (Grant No. EP/L015943/1)

The authors would like to acknowledge the use of Athena at HPC Midlands+, which was funded by the EPSRC (Grant No. EP/P020232/1).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Physics of Fluids

Volume

32

Issue

4

Publisher

AIP Publishing

Version

AM (Accepted Manuscript)

Rights holder

© The Authors

Publisher statement

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids, 32 (4), 045115 and may be found at https://aip.scitation.org/doi/10.1063/1.5141750.

Acceptance date

03/04/2020

Publication date

2020-04-27

Copyright date

2020

ISSN

1070-6631

eISSN

1089-7666

Language

en

Depositor

Dr Hao Xia. Deposit date: 28 April 2020

Article number

045115