Abo Bibliothek: Guest
Turbulence Heat and Mass Transfer 5. Proceedings of the International Symposium on Turbulence Heat and Mass Transfer
September, 25-29, 2006, Dubrovnik, Croatia

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf


ISBN Print: 978-1-56700-229-4

ISSN: 2377-2816

Temporal Large Eddy Simulation of Unstratified and Stably Stratified Turbulent Channel Flows

pages 311-314
DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.580
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ABSTRAKT

A recently proposed approach to large-eddy simulation (LES) based on time-domain filtering is tested on turbulent channel flows. Temporal LES (i.e. TLES) is based on a splitting of the temporal scales into resolved filter-scale (RFS), resolved subfilter-scale (RSFS) and unresolved subfilter-scale (USFS) components. This decomposition leads to the temporally filtered Navier-Stokes equations (i.e. the TLES equations) governing the motions of the RFS component. The TLES equations contain a subfilter-scale (SFS) stress, reflecting the effect of the RSFS and USFS components on the RFS component. The RSFS component of the SFS stress is approximated via temporal deconvolution while the USFS component is approximated via high order artificial viscosity in the form of a temporal regularization. Here, the effects of the (approximated) RSFS stress and the temporal regularization are analyzed in fully-developed, unstratified turbulent channel flow. Furthermore, the TLES methodology is extended to fully-developed, stably, thermally stratified turbulent channel flow.

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