Scaling the Decay of Turbulence Kinetic Energy in the Free-Convective Boundary Layer

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dc.identifier.uri http://dx.doi.org/10.15488/5230
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/5277
dc.contributor.author El Guernaoui, Omar
dc.contributor.author Reuder, Joachim
dc.contributor.author Esau, Igor
dc.contributor.author Wolf, Tobias
dc.contributor.author Maronga, Björn
dc.date.accessioned 2019-08-26T07:56:08Z
dc.date.available 2019-08-26T07:56:08Z
dc.date.issued 2019
dc.identifier.citation El Guernaoui, O.; Reuder, J.; Esau, I.; Wolf, T.; Maronga, B.: Scaling the Decay of Turbulence Kinetic Energy in the Free-Convective Boundary Layer. In: Boundary-Layer Meteorology 173 (2019), Nr. 1, S. 79-97. DOI: https://doi.org/10.1007/s10546-019-00458-z
dc.description.abstract We investigate the scaling for decaying turbulence kinetic energy (TKE) in the free-convective boundary layer, from the time the surface heat flux starts decaying, until a few hours after it has vanished. We conduct a set of large-eddy simulation experiments, consider various initial convective situations, and prescribe realistic decays of the surface heat flux over a wide range of time scales. We find that the TKE time evolution is dictated by the decaying magnitude of the surface heat flux up to 0.7 τ approximately, where τ is the prescribed duration from maximum to zero surface heat flux. During the time period starting at zero surface heat flux, we search for potential power-law scaling by examining the log–log presentation of TKE as a function of time. First, we find that the description of the decay highly depends on whether the time origin is defined as the time when the surface heat flux starts decaying (traditional scaling framework), or the time when it vanishes (proposed new scaling framework). Second, when varying τ, the results plotted in the traditional scaling framework indicate variations in the power-law decay rates over several orders of magnitude. In the new scaling framework, however, we find a unique decay exponent in the order of 1, independent of the initial convective condition, and independent of τ, giving support for the proposed scaling framework. eng
dc.language.iso eng
dc.publisher Dordrecht : Springer Netherland
dc.relation.ispartofseries Boundary-Layer Meteorology 173 (2019), Nr. 1
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject Convective scaling eng
dc.subject Free-convective boundary layer eng
dc.subject Power-law scaling eng
dc.subject Similarity relations eng
dc.subject Turbulence kinetic energy decay eng
dc.subject Atmospheric thermodynamics eng
dc.subject Boundary layer flow eng
dc.subject Boundary layers eng
dc.subject Decay (organic) eng
dc.subject Heat convection eng
dc.subject Kinetic energy eng
dc.subject Kinetics eng
dc.subject Large eddy simulation eng
dc.subject Lattice vibrations eng
dc.subject Turbulence eng
dc.subject Convective boundary layers eng
dc.subject Convective scaling eng
dc.subject Power law scalings eng
dc.subject Similarity relations eng
dc.subject Turbulence kinetic energy eng
dc.subject Heat flux eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Scaling the Decay of Turbulence Kinetic Energy in the Free-Convective Boundary Layer eng
dc.type article
dc.type Text
dc.relation.issn 0006-8314
dc.relation.doi https://doi.org/10.1007/s10546-019-00458-z
dc.bibliographicCitation.firstPage 79
dc.bibliographicCitation.lastPage 97
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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