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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

NUMERICAL SIMULATION OF TRANSONIC BUFFET FLOWS USING VARIOUS TURBULENCE CLOSURES

G. Barakos
UMIST Mechanical Engineering Department, PO Box 88 Manchester M60 1QD, United Kingdom

Dimitris Drikakis
Fluid Mechanics and Computational Science Group, Department of Aerospace Sciences, School of Engineering, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK

Abstract

Numerical simulation of buffet flows have been performed using various turbulence models, including linear and non-linear low-Re eddy-viscosity models. The accuracy of the models has been assessed against experimental data for transonic flows around the NACA-0012 aerofoil. Discretisation of the mean flow and turbulence transport equations is obtained by a Riemann solver up to third-order accurate. The time integration is obtained by an implicit unfactored method. The study shows that two-equation models associated with functional cμ coefficient in the calculation of the eddy-viscosity (henceforth labelled NL-cμ), provide better results. The Spalart-Allmaras one-equation model provides comparable results with the above models, while larger inaccuracies are presented in the case of linear and non-linear models with constant cμ coefficient. The buffet onset boundaries are similarly predicted by the one-equation and NL-cμ models.