Application of Dynamic Subgrid-scale Models for Large-eddy Simulation of the Daytime Convective Boundary Layer over Heterogeneous Surfaces |
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Authors: | Hsin-Yuan Huang Bjorn Stevens Steven A Margulis |
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Institution: | (1) Department of Civil and Environmental Engineering, University of California, Los Angeles, 5732D Boelter Hall, Los Angeles, CA 90095, USA;(2) Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, USA |
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Abstract: | The sensitivity of large-eddy simulation (LES) to the representation of subgrid-scale (SGS) processes is explored for the
case of the convective boundary layer (CBL) developing over surfaces with varying degrees of spatial heterogeneity. Three
representations of SGS processes are explored: the traditional constant Smagorinsky–Lilly model and two other dynamic models
with Lagrangian averaging approaches to calculate the Smagorinsky coefficient (C
S
) and SGS Prandtl number (Pr). With initial data based roughly on the observed meteorology, simulations of daytime CBL growth are performed over surfaces
with characteristics (i.e. fluxes and roughness) ranging from homogeneous, to striped heterogeneity, to a realistic representation
of heterogeneity as derived from a recent field study. In both idealized tests and the realistic case, SGS sensitivities are
mostly manifest near the surface and entrainment zone. However, unlike simulations over complex domains or under neutral or
stable conditions, these differences for the CBL simulation, where large eddies dominate, are not significant enough to distinguish
the performance of the different SGS models, irrespective of surface heterogeneity. |
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Keywords: | Convective boundary layer Dynamic subgrid-scale model Heterogeneous surface Large-eddy simulation |
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