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Direct numerical simulation and large-eddy simulation of a shear-free mixing layer

Published online by Cambridge University Press:  24 August 2004

B. KNAEPEN ,
O. DEBLIQUY  and
D. CARATI
B. KNAEPEN
Affiliation:
Center for Turbulence Research, Stanford University/NASA Ames Research Center, 488 Escondido Mall, Building 500/500A, Stanford University, CA 94305-3035, USA
O. DEBLIQUY
Affiliation:
Universté Libre de Bruxelles, Statistical and Plasma Physics, CP231, Boulevard du Triomphe, Campus Plaine, 1050 Brussels, Belgium
D. CARATI
Affiliation:
Universté Libre de Bruxelles, Statistical and Plasma Physics, CP231, Boulevard du Triomphe, Campus Plaine, 1050 Brussels, Belgium
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Abstract

High resolution direct numerical simulation (DNS) (512×1024×512) and large-eddy simulation (LES) of a shear-free mixing layer are presented. The geometry of the flow consists of two layers with different turbulence intensities that are in contact and interact through a fairly thin mixing layer. This geometry is used to explore the influence of inhomogeneities in the characteristic length scales, times scales and energy scales on the turbulence properties. Comparison of DNS results is made with the Veeravalli & Warhaft (J. Fluid Mech.207, 191–229, 1989) experiment. The LES is performed on a 32×64×32 grid using an eddy-viscosity model. The use of such a model appears to be justified by the very weak departures from isotropy that are observed in the shear-free mixing layer. The LES predictions are compared with the filtered DNS data and show that the eddy viscosity model performs very well in predicting the energy profile as well as the deviation from Gaussianity in the turbulent velocity field statistics.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 514 , 10 September 2004 , pp. 153 - 172
Copyright
© 2004 Cambridge University Press

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