Addressing the Grid-Size Sensitivity Issue in Large-Eddy Simulations of Stable Boundary Layers

Originalpublikation

Dai, Y.; Basu, S.; Maronga, B.; de Roode, S.R.: Addressing the Grid-Size Sensitivity Issue in Large-Eddy Simulations of Stable Boundary Layers. In: Boundary-Layer Meteorology 178 (2021), S. 63-89. DOI: https://doi.org/10.1007/s10546-020-00558-1

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Zusammenfassung:
We have identified certain fundamental limitations of a mixing-length parametrization used in a popular turbulent kinetic energy-based subgrid-scale model. Replacing this parametrization with a more physically realistic one significantly improves the overall quality of the large-eddy simulation (LES) of stable boundary layers. For the range of grid sizes considered here (specifically, 1 m–12.5 m), the revision dramatically reduces the grid-size sensitivity of the simulations. Most importantly, the revised scheme allows us to reliably estimate the first- and second-order statistics of a well-known LES intercomparison case, even with a coarse grid size of O(10 m).
Lizenzbestimmungen: CC BY 4.0 Unported - https://creativecommons.org/licenses/by/4.0/
Publikationstyp: Article
Publikationsstatus: publishedVersion
Erstveröffentlichung: 2020
Schlagwörter (englisch): Boundary layers, Kinetic energy, Kinetics, Turbulent flow, Fundamental limitations, Intercomparisons, Overall quality, Parametrizations, Second order statistics, Stable boundary layer, Sub-grid scale models, Turbulent kinetic energy, Large eddy simulation, Buoyancy length scale, Prandtl number, Stable boundary layer, Subgrid-scale model
Fachliche Zuordnung (DDC): 550 | Geowissenschaften

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