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Vertically nested LES for high-resolution simulation of the surface layer in PALM (version 5.0)

Huq, Sadiq; De Roo, Frederik; Raasch, Siegfried; Mauder, Matthias

Abstract (englisch):
Large-eddy simulation (LES) has become a well-established tool in the atmospheric boundary layer research community to study turbulence. It allows three-dimensional realizations of the turbulent fields, which large-scale models and most experimental studies cannot yield. To resolve the largest eddies in the mixed layer, a moderate grid resolution in the range of 10 to 100 m is often sufficient, and these simulations can be run on a computing cluster with a few hundred processors or even on a workstation for simple configurations. The desired resolution is usually limited by the computational resources. However, to compare with tower measurements of turbulence and exchange fluxes in the surface layer, a much higher resolution is required. In spite of the growth in computational power, a high-resolution LES of the surface layer is often not feasible: to fully resolve the energy-containing eddies near the surface, a grid spacing of O(1 m) is required. One way to tackle this problem is to employ a vertical grid nesting technique, in which the surface is simulated at the necessary fine grid resolution, and it is coupled with a standard, coarse, LES that resolves the turbulence in the whole boundary layer. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000096494
Veröffentlicht am 16.07.2019
DOI: 10.5194/gmd-12-2523-2019
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 1991-959X, 1991-9603
KITopen-ID: 1000096494
HGF-Programm 12.02.05 (POF III, LK 01)
Atmospheric Exchange Processes
Erschienen in Geoscientific model development
Band 12
Heft 6
Seiten 2523-2538
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 28.06.2019
Nachgewiesen in Scopus
Web of Science
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