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On the role of subgrid-scale coherent modes in large-eddy simulation

Published online by Cambridge University Press:  17 February 2005

G. DE STEFANO ,
D. E. GOLDSTEIN  and
O. V. VASILYEV
G. DE STEFANO
Affiliation:
Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Universitá di Napoli, I 81031 Aversa, Italy
D. E. GOLDSTEIN
Affiliation:
Department of Mechanical Engineering, University of Colorado, 427 UCB, CO 80309 Boulder, USA
O. V. VASILYEV
Affiliation:
Department of Mechanical Engineering, University of Colorado, 427 UCB, CO 80309 Boulder, USA
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Abstract

The role of coherent and incoherent subgrid-scale modes in large-eddy simulation modelling is examined. The coherent/incoherent decomposition of the subgrid-scale stresses based on the wavelet de-noising procedure is introduced. A priori dynamical tests based on the perfect modelling approach are performed for decaying isotropic turbulence. The theoretical effects of coherent and incoherent subgrid-scale forces are dynamically evaluated during the simulation. The relation between deterministic/stochastic subgrid-scale models and coherent/incoherent subgrid-scale stresses is discussed. The main result is that in large-eddy simulations low-order statistics can be almost exactly reproduced when only the effect of the coherent subgrid-scale modes is accounted for, while the incoherent subgrid-scale modes have a negligible effect upon the large-scale dynamics and the energy transfer.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 525 , 25 February 2005 , pp. 263 - 274
Copyright
© 2005 Cambridge University Press

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