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 - 2020
Y1 - 2020
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: an international journal of physical and biological processes in the atmospheric boundary layer
JF - Boundary-Layer Meteorology: an international journal of physical and biological processes in the atmospheric boundary layer
SN - 0006-8314
IS - 1
ER -