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Study of Transitions in the Atmospheric Boundary Layer Using Explicit Algebraic Turbulence Models
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Mechanics, Turbulence. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9819-2906
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2016 (English)In: Boundary-layer Meteorology, ISSN 0006-8314, E-ISSN 1573-1472, Vol. 161, no 1, p. 19-47Article in journal (Refereed) Published
Abstract [en]

We test a recently developed engineering turbulence model, a so-called explicit algebraic Reynolds-stress (EARS) model, in the context of the atmospheric boundary layer. First of all, we consider a stable boundary layer used as the well-known first test case from the Global Energy and Water Cycle Experiment Atmospheric Boundary Layer Study (GABLS1). The model is shown to agree well with data from large-eddy simulations (LES), and this agreement is significantly better than for a standard operational scheme with a prognostic equation for turbulent kinetic energy. Furthermore, we apply the model to a case with a (idealized) diurnal cycle and make a qualitative comparison with a simpler first-order model. Some interesting features of the model are highlighted, pertaining to its stronger foundation on physical principles. In particular, the use of more prognostic equations in the model is shown to give a more realistic dynamical behaviour. This qualitative study is the first step towards a more detailed comparison, for which additional LES data are needed.

Place, publisher, year, edition, pages
Springer, 2016. Vol. 161, no 1, p. 19-47
Keywords [en]
Diurnal cycle, Reynolds-stress models, Single-column models, Stable stratification, Turbulence parametrization
National Category
Fluid Mechanics and Acoustics Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:kth:diva-194460DOI: 10.1007/s10546-016-0194-1ISI: 000384412900002Scopus ID: 2-s2.0-84982984249OAI: oai:DiVA.org:kth-194460DiVA, id: diva2:1043729
Funder
Swedish Research Council, 621-2013-5784
Note

QC 20161103

Available from: 2016-10-31 Created: 2016-10-28 Last updated: 2017-11-29Bibliographically approved

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Lazeroms, Werner M. J.Brethouwer, GeertWallin, StefanJohansson, Arne V.
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