A large-eddy simulation study of thermal effects on turbulent flow and dispersion in and above a street canyon

Show simple item record

dc.identifier.uri http://dx.doi.org/10.15488/5504
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/5551
dc.contributor.author Park, S.-B.
dc.contributor.author Baik, J.-J.
dc.contributor.author Raasch, S.
dc.contributor.author Letzel, M.O.
dc.date.accessioned 2019-10-09T10:27:12Z
dc.date.available 2019-10-09T10:27:12Z
dc.date.issued 2012
dc.identifier.citation Park, S.-B.; Baik, J.-J.; Raasch, S.; Letzel, M.O.: A large-eddy simulation study of thermal effects on turbulent flow and dispersion in and above a street canyon. In: Journal of Applied Meteorology and Climatology 51 (2012), Nr. 3, S. 829-841. DOI: https://doi.org/10.1175/JAMC-D-11-0180.1
dc.description.abstract Thermal effects on turbulent flow and dispersion in and above an idealized street canyon with a street aspect ratio of 1 are numerically investigated using the parallelized large-eddy simulation model (“PALM”). Each of upwind building wall, street bottom, and downwind building wall is heated, and passive scalars are emitted from the street bottom. When compared with the neutral (no heating) case, the heating of the upwind building wall or street bottom strengthens a primary vortex in the street canyon and the heating of the downwind building wall induces a shrunken primary vortex and a winding flow between the vortex and the downwind building wall. Heating also induces higher turbulent kinetic energy and stronger turbulent fluxes at the rooftop height. In the neutral case, turbulent eddies generated by shear instability dominate mixing at the rooftop height and appear as band-shaped perturbations in the time–space plots of turbulent momentum and scalar fluxes. In all of the heating cases, buoyancy-generated turbulent eddies as well as shear-generated turbulent eddies contribute to turbulent momentum and scalar fluxes and band-shaped or lump-shaped perturbations appear at the rooftop height. A quadrant analysis shows that at the rooftop height, in the neutral case and in the case with upwind building-wall heating, sweep events are less frequent but contribute more to turbulent momentum flux than do ejection events. By contrast, in the case with street-bottom and downwind building-wall heating, the frequency of sweep events is similar to that of ejection events and the contribution of ejection events to turbulent momentum flux is comparable to that of sweep events. Copyright 2012 American Meteorological Society eng
dc.language.iso eng
dc.publisher Boston, Massachusetts : American Meteorological Society
dc.relation.ispartofseries Journal of Applied Meteorology and Climatology 51 (2012), Nr.3
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject Fluxes eng
dc.subject Heating eng
dc.subject Momentum eng
dc.subject Turbulence eng
dc.subject Large eddy simulations eng
dc.subject Urban meteorology eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.subject.ddc 551 | Geologie, Hydrologie, Meteorologie ger
dc.title A large-eddy simulation study of thermal effects on turbulent flow and dispersion in and above a street canyon eng
dc.type Article
dc.type Text
dc.relation.essn 1558-8432
dc.relation.issn 1558-8424
dc.relation.doi https://doi.org/10.1175/JAMC-D-11-0180.1
dc.bibliographicCitation.issue 5
dc.bibliographicCitation.volume 51
dc.bibliographicCitation.firstPage 829
dc.bibliographicCitation.lastPage 841
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

Files in this item

This item appears in the following Collection(s):

Show simple item record


Search the repository


My Account

Usage Statistics