Algebraic closures for the turbulent scalar fluxes were evaluated for a discrete hole film cooling geometry using the results from the high-fidelity Large Eddy Simulation (LES) of Bodart et al. [1]. Several models for the turbulent scalar fluxes exist, including the widely used Gradient Diffusion Hypothesis, the Generalized Gradient Diffusion Hypothesis [2], and the Higher Order Generalized Gradient Diffusion Hypothesis [3]. By analyzing the results from the LES, it was possible to isolate the error due to these turbulent mixing models. Distributions of the turbulent diffusivity, turbulent viscosity, and turbulent Prandtl number were extracted from the LES results. It was shown that the turbulent Prandtl number varies significantly spatially, undermining the applicability of the Reynolds analogy for this flow. The LES velocity field and Reynolds stresses were fed into a RANS solver to calculate the fluid temperature distribution. This analysis revealed in which regions of the flow various modeling assumptions were invalid and what effect those assumptions had on the predicted temperature distribution.
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ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
June 15–19, 2015
Montreal, Quebec, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5672-7
PROCEEDINGS PAPER
Analysis of Turbulent Scalar Flux Models for a Discrete Hole Film Cooling Flow Available to Purchase
Kevin J. Ryan,
Kevin J. Ryan
Stanford University, Stanford, CA
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Julien Bodart,
Julien Bodart
University of Toulouse, Toulouse, France
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John K. Eaton
John K. Eaton
Stanford University, Stanford, CA
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Julia Ling
Stanford University, Stanford, CA
Kevin J. Ryan
Stanford University, Stanford, CA
Julien Bodart
University of Toulouse, Toulouse, France
John K. Eaton
Stanford University, Stanford, CA
Paper No:
GT2015-42092, V05BT12A001; 10 pages
Published Online:
August 12, 2015
Citation
Ling, J, Ryan, KJ, Bodart, J, & Eaton, JK. "Analysis of Turbulent Scalar Flux Models for a Discrete Hole Film Cooling Flow." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 5B: Heat Transfer. Montreal, Quebec, Canada. June 15–19, 2015. V05BT12A001. ASME. https://doi.org/10.1115/GT2015-42092
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