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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2012006402
pages 497-506

ZONAL RANS-LES MODELING FOR TURBINES IN AEROENGINES

Paul G. Tucker
Fluid Dynamics Research Centre, School of Engineering, The University of Warwick, Coventry; Whittle laboratory, University of Cambridge, UK
R. Jefferson-Loveday
Whittle Laboratory, University of Cambridge, Cambridge, CB3 0DY United Kingdom
James Tyacke
Whittle Laboratory, University of Cambridge, Cambridge, CB3 0DY United Kingdom
V. Nagabhushana Rao
Whittle Laboratory, University of Cambridge, Cambridge, CB3 0DY United Kingdom

ABSTRACT

The cost of large-eddy simulation (LES) modeling in various zones of gas turbine aeroengines is outlined. This high cost clearly demonstrates the need to perform hybrid Reynolds-averaged Navier-Stokes-LES (RANS-LES) over the majority of engine zones because the Reynolds number is too high for pure LES. The RANS layer is used to cover over the fine streaks found in the inner part of the boundary layer. The hybrid strategy is applied to various engine zones, which is shown to typically give much greater predictive accuracy than pure RANS simulations. However, the cost estimates show that the RANS layer should be disposed within the low-pressure turbine zone. Also, the nature of the flow physics in this zone makes LES most sensible.

KEY WORDS: LES, RANS, hybrid, zonal, turbine

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