Title

Large-Eddy Simulations of a Cylindrical Film Cooling Hole

Authors

Authors

P. L. Johnson;J. S. Kapat

Comments

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Abbreviated Journal Title

J. Thermophys. Heat Transf.

Keywords

TURBULENT BOUNDARY-LAYER; DETAILED ANALYSIS; STREAMWISE INJECTION; CROSS-FLOW; PHYSICS; JETS; GENERATION; DOWNSTREAM; MODEL; Thermodynamics; Engineering, Mechanical

Abstract

Large-eddy simulations are used to explore the unsteady jet-in-crossflow interactions arising from discrete hole film cooling from a cylindrical hole. The numerical grids are created using GridPro and solved in OpenFOAM. A recycling-rescaling technique is used to generate a realistic turbulent incoming boundary layer upstream of injection. The simulations match the conditions of an experiment in the open literature for the robust validation of the numerical solution and turbulence modeling. The current study tests the ability of large-eddy simulations in predicting film cooling flows using detailed experimental measurements. The large-eddy simulation results compared favorably with the experimental data except in areas close to the injection site and close to the wall. Grid resolution is discussed in terms of the percent turbulent kinetic energy resolved and related to the success of the large eddy simulation predictions in different regions of the jet. No substantial benefit was seen by using a dynamic Smagorinsky model for the subgrid turbulent heat fluxes instead of a constant subgrid Prandtl number. The trajectories, spreading rates, and large turbulent structures of the jet are discussed in terms of the hydrodynamic parameters such as velocity ratio and momentum ratio.

Journal Title

Journal of Thermophysics and Heat Transfer

Volume

27

Issue/Number

2

Publication Date

1-1-2013

Document Type

Article; Proceedings Paper

Language

English

First Page

255

Last Page

273

WOS Identifier

WOS:000317880600007

ISSN

0887-8722

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