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Large-Eddy Simulation of a Neutrally Stratified Boundary Layer: A Comparison of Four Computer Codes

Andren, A. and Brown, A.R. and Graf, J. and Mason, P.J. and Moeng, C.-H. and Nieuwstadt, F.T.M. and Schumann, U. (1994) Large-Eddy Simulation of a Neutrally Stratified Boundary Layer: A Comparison of Four Computer Codes. Quarterly Journal of the Royal Meteorological Society, 120, pp. 1457-1484. DOI: 10.1002/qj.49712052003

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Abstract

A neutrally stratified Ekman layer limited in depth by a stress-free rigid lid has been simulated using four different large-eddy simulation computer codes. This is the second large-eddy simulation intercomparison study in a series of simulations of different flows aimed at a systematic analysis of large-eddy simulation sensitivity to subgrid scale model assumptions and numerical methods. The resolution was chosen to be coarse so that the results might be sensitive to the details of the various subgrid scale model formulations. Stochastic backscatter of subgrid kinetic energy and scalar variance was included in one subgrid scale model. Profiles of first and second moments, budgets of resolved-scale second moments, and spectra have been analyzed. It is found that significant differences in the lowest third of the boundary layer result from moderate changes in subgrid scale eddy diffusivities or from the inclusion of backscatter. To isolate effects of the various numerical methods, a set of tests with a fixed subgrid scale K-profile were made. When run with a common subgrid scale model the results from the four large-eddy simulation codes converge. This test indicates that the large-eddy simulation results are more sensitive to the subgrid scale model formulations than to the various numerics.

Item URL in elib:https://elib.dlr.de/31898/
Document Type:Article
Title:Large-Eddy Simulation of a Neutrally Stratified Boundary Layer: A Comparison of Four Computer Codes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Andren, A.Dep. of Met., Univ. Uppsala, SUNSPECIFIED
Brown, A.R.Met. Office, Bracknell, UKUNSPECIFIED
Graf, J.UNSPECIFIEDUNSPECIFIED
Mason, P.J.Met. Office, Bracknell, UKUNSPECIFIED
Moeng, C.-H.NCAR, Boulder, CO, USAUNSPECIFIED
Nieuwstadt, F.T.M.Univ. of Techn., Delft, NLUNSPECIFIED
Schumann, U.UNSPECIFIEDUNSPECIFIED
Date:1994
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:120
DOI :10.1002/qj.49712052003
Page Range:pp. 1457-1484
Status:Published
Keywords:Ekman Layer, large-eddy simulation, boundary layer, turbulence, numerical simulation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Deposited By: DLR-Beauftragter, elib
Deposited On:30 Jan 2008
Last Modified:31 Jul 2019 19:17

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