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2011: The effect of mesh resolution on convective boundarylayer statistics and structures generated by largeeddy simulation
 J. Atmos. Sci
"... A massively parallel largeeddy simulation (LES) code for planetary boundary layers (PBLs) that utilizes pseudospectral differencing in horizontal planes and solves an elliptic pressure equation is described. As an application, this code is used to examine the numerical convergence of the threedime ..."
Abstract

Cited by 14 (7 self)
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A massively parallel largeeddy simulation (LES) code for planetary boundary layers (PBLs) that utilizes pseudospectral differencing in horizontal planes and solves an elliptic pressure equation is described. As an application, this code is used to examine the numerical convergence of the threedimensional timedependent simulations of a weakly sheared daytime convective PBL on meshes varying from 323 to 10243 grid points. Based on the variation of the secondorder statistics, energy spectra, and entrainment statistics, LES solutions converge provided there is adequate separation between the energycontaining eddies and those near the filter cutoff scale. For the convective PBL studied, the majority of the loworder moment statistics (means, variances, and fluxes) become grid independent when the ratio zi/(CsDf). 310, where zi is the boundary layer height, Df is the filter cutoff scale, and Cs is the Smagorinsky constant. In this regime, the spectra show clear Kolmogorov inertial subrange scaling. The bulk entrainment rate determined from the time variation of the boundary layer height we 5 dzi/dt is a sensitive measure of the LES solution convergence; we becomes grid independent when the vertical grid resolution is able to capture both the mean structure of the overlying inversion and the turbulence. For all mesh resolutions used, the vertical temperature flux profile varies linearly over the interior of the boundary layer and the minimum temperature flux is approximately20.2 of the surface heat flux. Thus, these metrics are inadequate measures of solution convergence. The variation of the vertical velocity skewness and thirdorder moments expose the LES’s sensitivity to grid resolution. 1.
11B.5 A HIGHLY PARALLEL ALGORITHM FOR TURBULENCE SIMULATIONS IN PLANETARY BOUNDARY LAYERS: RESULTS WITH MESHES UP TO 10243
"... Petascale computing (e.g., UCAR/JOSS, 2005) has the potential to alter the landscape of turbulence simulations in planetary boundary layers (PBLs). Increased computer power using O(104−105) or more processors ..."
Abstract
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Petascale computing (e.g., UCAR/JOSS, 2005) has the potential to alter the landscape of turbulence simulations in planetary boundary layers (PBLs). Increased computer power using O(104−105) or more processors