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Large‐Eddy simulation of film cooling: treatment of inlet boundary conditions for the isobaric plenum and instantaneous vortex structures
Author(s) -
Ziefle Jörg,
Kleiser Leonhard
Publication year - 2007
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200701046
Subject(s) - plenum space , mechanics , boundary layer , large eddy simulation , jet (fluid) , turbulence , inflow , nozzle , physics , materials science , thermodynamics
We present large‐eddy simulation (LES) results of a jet‐in‐crossflow configuration that was previously investigated in the experiments of Sinha et al. (J. Turbomach., Vol. 113, 1991). In this film‐cooling setup, relatively cool air is ejected from a large isobaric plenum through an oblique round nozzle into a hotter turbulent boundary layer. In accordance with typical film‐cooling conditions, the jet‐to‐crossflow velocity and temperature ratios were chosen as 0.25 and 0.5, respectively (defined with bulk quantities for the jet and freestream quantities for the boundary layer). The numerical simulations are performed with the compressible finite‐volume flow solver for structured multi‐block grids NSMB. The approximate‐deconvolution subgrid‐scale model (ADM) accounts for the non‐resolved scales. The problem of the unknown plenum pressure is handled by a combination of a sponge region with a non‐reflecting boundary condition at the plenum inlet. For computational economy, the turbulent boundary layer of the experiment is replaced by a steady mean turbulent inflow profile. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)