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

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
5 Downloads (Pure)

Abstract

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).

Original languageEnglish
Pages (from-to)63-89
Number of pages27
JournalBoundary-Layer Meteorology
Volume178
Issue number1
DOIs
Publication statusPublished - 2020

Keywords

  • Buoyancy length scale
  • Prandtl number
  • Stable boundary layer
  • Subgrid-scale model

Fingerprint Dive into the research topics of 'Addressing the Grid-Size Sensitivity Issue in Large-Eddy Simulations of Stable Boundary Layers'. Together they form a unique fingerprint.

Cite this