Grid-point and time-step requirements for direct numerical simulation and large-eddy simulation
Overview
Paper Summary
This study finds that the grid-point requirement for DNS of a spatially developing turbulent boundary layer is N ~ Re^2.05, less than previously thought. It also estimates time-step requirements for DNS and LES, suggesting that wall-modeled LES becomes increasingly more cost-efficient than wall-resolved LES and DNS as Reynolds number increases.
Explain Like I'm Five
Scientists found that when computers imagine how swirly air or water moves, they need fewer tiny boxes than they first thought. They also learned that for really big or fast swirls, one special way of imagining it works much faster for the computer.
Possible Conflicts of Interest
None identified
Identified Limitations
Rating Explanation
This paper revisits prior estimates for grid-point requirements in DNS and LES of turbulent boundary layers, deriving more general estimates and providing a useful framework for optimization. The methodology is sound, but the reliance on certain assumptions and simplifications limits the broader applicability. Overall, a strong contribution to the field, warranting a rating of 4.
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