DOI: 10.1615/TSFP2
HYBRID RANS/LES : SPATIAL-RESOLUTION AND ENERGY-TRANSFER ISSUES
RESUMO
This paper considers issues relating to the development of hybrid models of turbulence which blend automatically between conventional unsteady Reynolds-Averaged Navier-Stokes (URANS) simulation and large-eddy simulation (LES), according to the local grid density. Several independent research efforts have already been directed toward locally embedded LES, using both zonal approaches and emerging hybrid methods; the latter attempting to capture the switch between LES and RANS within a single modeling framework. This paper reviews some existing developments in the area and identifies several shared philosophies and common goals, as well as a remaining weakness, concerning the transfer of kinetic-energy between unresolved and resolved components. A framework is introduced in an attempt to account for this missing kinetic-energy transfer.