Unlike Reynolds-averaged Navier–Stokes (RANS) models that need calibration for different flow classes, LES (where larger turbulent structures are resolved by the grid and smaller modeled in a fashion reminiscent of RANS) offers the opportunity to resolve geometry dependent turbulence as found in complex internal flows—albeit at substantially higher computational cost. Based on the results for a broad range of studies involving different numerical schemes, large eddy simulation (LES) models and grid topologies, an LES hierarchy and hybrid LES related approach is proposed. With the latter, away from walls, no LES model is used, giving what can be termed numerical LES (NLES). This is relatively computationally efficient and makes use of the dissipation present in practical industrial computational fluid dynamics (CFD) programs. Near walls, RANS modeling is used to cover over numerous small structures, the LES resolution of which is generally intractable with current computational power. The linking of the RANS and NLES zones through a Hamilton–Jacobi equation is advocated. The RANS-NLES hybridization makes further sense for compressible flow solvers, where, as the Mach number tends to zero at walls, excessive dissipation can occur. The hybrid strategy is used to predict flow over a rib roughened surface and a jet impinging on a convex surface. These cases are important for blade cooling and show encouraging results. Further results are presented in a companion paper.
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March 2012
Research Papers
Hybrid LES Approach for Practical Turbomachinery Flows—Part I: Hierarchy and Example Simulations
Paul Tucker,
Paul Tucker
Professor
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
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Simon Eastwood,
Simon Eastwood
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
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Christian Klostermeier,
Christian Klostermeier
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
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Richard Jefferson-Loveday,
Richard Jefferson-Loveday
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
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James Tyacke,
James Tyacke
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
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Yan Liu
Yan Liu
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
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Paul Tucker
Professor
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
Simon Eastwood
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
Christian Klostermeier
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
Richard Jefferson-Loveday
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
James Tyacke
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United Kingdom
Yan Liu
Department of Engineering, Whittle Laboratory,
University of Cambridge
, CB3 0DY, Cambridge, United KingdomJ. Turbomach. Mar 2012, 134(2): 021023 (10 pages)
Published Online: July 7, 2011
Article history
Received:
July 2, 2010
Revised:
July 30, 2010
Online:
July 7, 2011
Published:
July 7, 2011
Connected Content
A companion article has been published:
Hybrid LES Approach for Practical Turbomachinery Flows—Part II: Further Applications
Citation
Tucker, P., Eastwood, S., Klostermeier, C., Jefferson-Loveday, R., Tyacke, J., and Liu, Y. (July 7, 2011). "Hybrid LES Approach for Practical Turbomachinery Flows—Part I: Hierarchy and Example Simulations." ASME. J. Turbomach. March 2012; 134(2): 021023. https://doi.org/10.1115/1.4003061
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