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Scale-resolving simulations of spatially evolving turbulence: Physically consistent inflow specification of unresolved velocity and length-scale profiles
Phys. Rev. Fluids 5, 124604 – Published 14 December, 2020
DOI: https://doi.org/10.1103/PhysRevFluids.5.124604
Abstract
Scale-resolving simulations (SRS) of spatially evolving turbulent flows require specification of physically meaningful inflow fields for optimal outcome. SRS methods that employ two-equation subgrid closures must ensure that the inflow unresolved-field velocity-scale (kinetic energy) and length-scale (dissipation or frequency) distributions are compatible with the inflow resolved fields. This work aims to develop accurate inflow turbulent boundary layer description by (i) adapting the recycling-rescaling technique for the resolved field and (ii) deriving unresolved flow-field statistics that are consistent with the resolved-flow profile using the equilibrium boundary layer analysis. The proposed scheme is employed to simulate a spatially evolving zero pressure gradient flat plate boundary layer over a computational domain of . The SRS results are evaluated in the following categories: wall coefficients, mean-flow profiles, second- and higher-order moments, and multipoint correlations. The agreement with established direct numerical simulation data is shown to be good. Equally importantly, it is demonstrated that the prescribed degree of flow resolution is maintained quite precisely. Overall, the results indicate that the proposed approach can improve the computational efficiency of two-equation SRS closure methods in a wide range of spatially developing turbulent flows.
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