Closure modeling in near-wall region of steep resolution variation for partially averaged Navier-Stokes simulations

Abstract

Accurate representation of the near-wall flow physics at high Reynolds numbers is computationally prohibitive for many uniform resolution turbulence models. Therefore, a closure with spatially varying resolution is sought which seamlessly transitions from low resolution RANS near-wall to high-resolution PANS in the outer region. This new modeling strategy systematically accounts for the energy exchange terms between the resolved and unresolved scales in the region of resolution change. By ensuring energy conservation and equilibrium boundary layer (EBL) scaling, the model accurately captures the flow behavior near-wall for turbulent channel flow at high Reynolds numbers.