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Synthetic boundary conditions using les for urban dispersion modelling
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. FOI, Swedish Defence Research Agency, Division of CBRN Defence and Security, Umeå, Sweden.
2017 (English)In: HARMO 2017 - 18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings, Hungarian Meteorological Service , 2017, p. 788-792Conference paper, Published paper (Refereed)
Abstract [en]

Large Eddy Simulation with two sub-grid-scale models are used to simulate gas dispersion, utilizing alternatively constant values and synthetic turbulence at inflow boundaries. The results are compared with data from the JU2003 Atmospheric Dispersion Study in Oklahoma City. Turbulence statistics of the simulation is presented at two probe locations, one inside the city-core and one outside. In addition, comparisons with the measured concentration-data and maximum-values are conducted. It was found that in the core of the city, modeled turbulence is mainly determined by buildings and their configurations, and is only weakly affected by model type and assumed turbulence at inflow boundaries. Within the predicted flow-path, the tested models produce similar predictions of maximum concentration values, which in turn are similar to the experimental data. The results indicate that synthetic turbulence at the inflow boundary is less important when building generated turbulence dominate but it is important if not a local boundary layer is developed.

Place, publisher, year, edition, pages
Hungarian Meteorological Service , 2017. p. 788-792
Keywords [en]
CFD, Contaminant statistics, Flow statistics, Gas dispersion, JU2003, LES, Urban area
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-228680Scopus ID: 2-s2.0-85047218210OAI: oai:DiVA.org:kth-228680DiVA, id: diva2:1210591
Conference
18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2017, CNR Research Area, Bologna, Italy, 9 October 2017 through 12 October 2017
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved

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Jonsson, Lage Tord Ingemar

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf