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Wall-Functions and Boundary Layer Response to Pulsating and Oscillating Turbulent Channel Flows

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.340
pages 209-212

D. Panara
DLR Deutsches Zentrum für Luft- und Raumfahrt e. V. Institut für Verbrennungstechnik, Stuttgart, Germany

M. Porta
CERFACS Centre Europeen de Recherche et de Formation Avancee en Calcul Scientifique, Toulouse, France

R. Dannecker
DLR Deutsches Zentrum für Luft- und Raumfahrt e. V. Institut für Verbrennungstechnik, Stuttgart, Germany

B. Noll
DLR Deutsches Zentrum für Luft- und Raumfahrt e. V. Institut für Verbrennungstechnik; DLR Institute of Combustion Technology, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany

Abstract

Some limitations of the classical Wall-Function approach for the near-wall boundary layer treatment in LES and URANS are presented for isothermal oscillating and pulsating channel flows. Despite their simple geometry, pulsating and oscillating flows are interesting unsteady flow test cases representative of many industrial components. A special attention will be focused on the unsteady wall-shear stress prediction since it is also an indirect measure of the unsteady wall-heat transfer. A correct evaluation of the unsteady wall heat transfer is in fact critical, for example, in combustion chamber applications when flow unsteadiness due to flame instability occurs and in general in each unsteady flow situation where thermo-acoustic phenomena play an important role.

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