Details
| Original language | English |
|---|---|
| Pages (from-to) | 63-89 |
| Number of pages | 27 |
| Journal | Boundary-Layer Meteorology |
| Volume | 178 |
| Issue number | 1 |
| Early online date | 24 Aug 2020 |
| Publication status | Published - Jan 2021 |
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).
Keywords
- Buoyancy length scale, Prandtl number, Stable boundary layer, Subgrid-scale model
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Atmospheric Science
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In: Boundary-Layer Meteorology, Vol. 178, No. 1, 01.2021, p. 63-89.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Addressing the Grid-Size Sensitivity Issue in Large-Eddy Simulations of Stable Boundary Layers
AU - Dai, Yi
AU - Basu, Sukanta
AU - Maronga, Björn
AU - de Roode, Stephan R.
PY - 2021/1
Y1 - 2021/1
N2 - 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).
AB - 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).
KW - Buoyancy length scale
KW - Prandtl number
KW - Stable boundary layer
KW - Subgrid-scale model
UR - http://www.scopus.com/inward/record.url?scp=85089733965&partnerID=8YFLogxK
U2 - 10.1007/s10546-020-00558-1
DO - 10.1007/s10546-020-00558-1
M3 - Article
AN - SCOPUS:85089733965
VL - 178
SP - 63
EP - 89
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
SN - 0006-8314
IS - 1
ER -