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Large-eddy simulations of turbulent mixing layers using the stretched-vortex model

Published online by Cambridge University Press:  11 February 2011

T. W. MATTNER
T. W. MATTNER*
Affiliation:
School of Mathematical Sciences, The University of Adelaide, SA 5005, Australia
*
†Email address for correspondence: [email protected]
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Abstract

The stretched-vortex subgrid model is used to run large-eddy simulations of temporal mixing layers at various Reynolds and Schmidt numbers, with different initial and boundary conditions. A self-similar flow is obtained, during which the growth rate, mean velocity and Reynolds stresses are in accord with experimental results. However, predictions of the amount of mixed fluid, and of the variation in its composition across the layer, are excessive, especially at high Schmidt number. More favourable comparisons between experiment and simulation are obtained when the large-scale flow is quasi-two-dimensional; however, such states are not self-similar and not sustainable. Present model assumptions lead to predictions of the continued subgrid spectrum with a viscous cutoff that is dependent on grid resolution.

JFM classification

Turbulent Flows: Shear layer turbulence Turbulent Flows: Turbulence simulation Mixing: Turbulent mixing
Type
Papers
Information
Journal of Fluid Mechanics , Volume 671 , 25 March 2011 , pp. 507 - 534
Copyright
Copyright © Cambridge University Press 2011

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