Joint effects of subgrid-scale diffusion and truncation errors in large-eddy simulations of the convective boundary layer

1996 ◽  
Vol 79 (1-2) ◽  
pp. 181-189
Author(s):  
Zbigniew Sorbjan
Keyword(s):  
Boundary Layer ◽  
Convective Boundary Layer ◽  
Large Eddy Simulations ◽  
Subgrid Scale ◽  
Convective Boundary ◽  
Joint Effects ◽  
Truncation Errors ◽  
Large Eddy

scholarly journals A Closer Look at Boundary Layer Inversion in Large-Eddy Simulations and Bulk Models: Buoyancy-Driven Case

2015 ◽  
Vol 72 (2) ◽  
pp. 728-749 ◽  
Author(s):  
Pierre Gentine ◽  
Gilles Bellon ◽  
Chiel C. van Heerwaarden
Keyword(s):  
Boundary Layer ◽  
Convective Boundary Layer ◽  
Weather Prediction ◽  
Inversion Layer ◽  
Large Eddy Simulations ◽  
Buoyancy Flux ◽  
Convective Boundary ◽  
Strong Inversion ◽  
Wide Range ◽  
Large Eddy

Abstract The inversion layer (IL) of a clear-sky, buoyancy-driven convective boundary layer is investigated using large-eddy simulations covering a wide range of convective Richardson numbers. A new model of the IL is suggested and tested. The model performs better than previous first-order models of the entrainment and provides physical insights into the main controls of the mixed-layer and IL growths. A consistent prognostic equation of the IL growth is derived, with explicit dependence on the position of the minimum buoyancy flux, convective Richardson number, and relative stratification across the inversion G. The IL model expresses the interrelationship between the position and magnitude of the minimum buoyancy flux and inversion-layer depth. These relationships emphasize why zero-order jump models of the convective boundary layer perform well under a strong inversion and show that these models miss the additional parameter G to fully characterize the entrainment process under a weak inversion. Additionally, the position of the minimum buoyancy flux within the new IL model is shown to be a key component of convective boundary layer entrainment. The new IL model is sufficiently simple to be used in numerical weather prediction or general circulation models as a way to resolve the IL in a low-vertical-resolution model.

Nesting Turbulence in an Offshore Convective Boundary Layer Using Large-Eddy Simulations

2014 ◽  
Vol 151 (3) ◽  
pp. 453-478 ◽  
Author(s):  
Domingo Muñoz-Esparza ◽  
Branko Kosović ◽  
Clara García-Sánchez ◽  
Jeroen van Beeck
Keyword(s):  
Boundary Layer ◽  
Convective Boundary Layer ◽  
Large Eddy Simulations ◽  
Convective Boundary ◽  
Large Eddy
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