DOI: 10.1615/TSFP8
A NOVEL DYNAMIC FORCING SCHEME INCORPORATING BACKSCATTER FOR HYBRID RANS/LES
RÉSUMÉ
In this paper, we present a novel dynamic forcing scheme incorporating backscatter in order to remove the artificial buffer layer in the hybrid RANS/LES approach. In contrast to previous forcing techniques, the proposed forcing scheme is determined dynamically from the flow field itself, and does not require any extraction of turbulent fields from reference databases obtained using direct numerical simulation (DNS) or wall-resolved LES. Transport equations for the resolved stresses and turbulent kinetic energy are introduced to investigate the effects of dynamic forcing on reduction of the thickness of the artificial buffer layer. The proposed forcing model has been tested in the context of turbulent channel flows with Reynolds numbers Reτ = 650 and 1020. In order to validate the hybrid RANS/LES approach, the first- and second-order flow statistics obtained are thoroughly compared with the available DNS data.