A restricted nonlinear large-eddy simulation model for wall- bounded turbulence

Abstract eng:
Recent direct numerical simulations (DNS) of the restricted nonlinear (RNL) model have demonstrated its ability to reproduce important features of wall-bounded turbulent flows despite the system’s simplified dynamics. The computational effort required by DNS has limited these studies to relatively low Reynolds numbers. In order to investigate the RNL system in the very high Reynolds number regime, we develop a new large-eddy simulation (LES) framework for the model to facilitate studies at effectively “infinite” Reynolds number. Early results confirm that the RNL-LES at “infinite” Reynolds number is successful in reproducing some of the same important statistical features captured in previous low Reynolds number simulations. The RNL-LES framework offers a new and useful tool to aid in understanding the connection between coherent structures and critical momentum transfer mechanisms of wall-bounded turbulent flows.

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