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Boundary-Layer Meteorology

, Volume 71, Issue 3, pp 247–276 | Cite as

A subgrid-scale model for large-eddy simulation of planetary boundary-layer flows

  • Peter P. Sullivan
  • James C. McWilliams
  • Chin-Hoh Moeng
Article

Abstract

A long-standing problem in large-eddy simulations (LES) of the planetary boundary layer (PBL) is that the mean wind and temperature profiles differ from the Monin-Obukhov similarity forms in the surface layer. This shortcoming of LES has been attributed to poor grid resolution and inadequate sub-grid-scale (SGS) modeling. We study this deficiency in PBL LES solutions calculated over a range of shear and buoyancy forcing conditions. The discrepancy from similarity forms becomes larger with increasing shear and smaller buoyancy forcing, and persists even with substantial horizontal grid refinement. With strong buoyancy forcing, however, the error is negligible.

In order to achieve better agreement between LES and similarity forms in the surface layer, a two-part SGS eddy-viscosity model is proposed. The model preserves the usual SGS turbulent kinetic energy formulation for the SGS eddy viscosity, but it explicitly includes a contribution from the mean flow and a reduction of the contributions from the turbulent fluctuations near the surface. Solutions with the new model yield increased fluctuation amplitudes near the surface and better correspondence with similarity forms out to a distance of 0.1–0.2 times the PBL depth, i.e., a typical surface-layer depth. These results are also found to be independent of grid anisotropy. The new model is simple to implement and computationally inexpensive.

Keywords

Turbulent Kinetic Energy Planetary Boundary Layer Eddy Viscosity Grid Refinement Planetary Boundary Layer Depth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Peter P. Sullivan
    • 1
  • James C. McWilliams
    • 1
  • Chin-Hoh Moeng
    • 1
  1. 1.National Center for Atmospheric ResearchBoulderUSA

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