A formulation for near-wall RANS/LES coupling

A near-wall eddy-viscosity formulation for LES is presented. A RANS-like eddy-viscosity corrected with the resolved turbulent stress is imposed in the near-wall region. The RANS eddy-viscosity is obtained from a resolved LES of channel flow at Re τ = 395 and stored in a look-up table. When used with...

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Veröffentlicht in:	International journal of engineering science 2006-10, Vol.44 (17), p.1099-1112
Hauptverfasser:	Medic, Gorazd, Templeton, Jeremy A., Kalitzin, Georgi
Format:	Artikel
Sprache:	eng
Schlagworte:	Exact sciences and technology Flows in ducts, channels, nozzles, and conduits Fluid dynamics Fundamental areas of phenomenology (including applications) Physics Turbulence simulation and modeling Turbulent flows, convection, and heat transfer
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Beschreibung
Zusammenfassung:	A near-wall eddy-viscosity formulation for LES is presented. A RANS-like eddy-viscosity corrected with the resolved turbulent stress is imposed in the near-wall region. The RANS eddy-viscosity is obtained from a resolved LES of channel flow at Re τ = 395 and stored in a look-up table. When used with a wall stress model, this technique enables LES to be performed on coarse grids. Results are presented for channel flow at several Reynolds numbers up to Re τ = 10,000. Various issues concerning the numerical behavior of the method are discussed.
ISSN:	0020-7225 1879-2197
DOI:	10.1016/j.ijengsci.2006.07.003