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SUMMARY:CFD modelling of flow and pollutant dispersion in urban areas\, ta
 king into account the radiative effects of the buildings
DTSTART:20090525T161500
DTSTAMP:20260506T221052Z
UID:e90c70a85e7e412639c32b88728d9f4216144f5f3a46f03b2651ba67
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Maya Milliez\, EDF R&D\, France\nUnderstanding the phenomen
 a occurring in urban areas\, such as flow motion and pollutant dispersion\
 , has a double aim: the first one is to evaluate the impact on population 
 and the environment on a local scale the second is to describe the bulk ef
 fects of buildings on flow and concentration fields. In the present work\,
  detailed numerical simulations are performed on an idealized urban area\,
  modelled as regular rows of large rectangular obstacles. The simulations 
 are performed at full scale with the three-dimensional Computational Fluid
   Dynamics model Mercure_Saturne (developed by EDF R&D and CEREA)\, which 
 is adapted to atmospheric flow and pollution dispersion. In this work\, we
  use a RANS approach with a  k-eps  turbulence closure. The simulations ar
 e evaluated with the near full-scale experiment MUST (Mock Urban Setting T
 est)\, which was conducted for the Defense Threat Reduction Agency in Utah
 's West Desert at US Army's Dugway Proving Ground. It consists of releases
  of inert gas in a field of 10 x 12 shipping containers and provides numer
 ous measurements. The dynamical effects have been extensively studied usin
 g CFD techniques\, usually assuming a neutral atmosphere and neglecting th
 e thermal effects. Nevertheless\, radiative transfer plays an important ro
 le because of its influence on the urban canopy energy budget. In order to
  take into account the radiation budget in simulations of pollution disper
 sion in urban areas\, we have developed a radiative scheme adapted to comp
 lex geometry\, by adapting to atmospheric radiative transfers a radiative 
 heat transfer scheme. This radiative scheme is based on the Discrete Ordin
 ate Method to solve the radiative transfer equation in a semi-transparent 
 media. The new model was validated with idealized cases for the solar and 
 infrared schemes and the results were compared to thermal measurements ava
 ilable in some of the cases of the MUST experiment.The current development
 s of this work are to study in detail the coupling between the dynamics an
 d the radiative transfers and to model explicitly a part of a real urban a
 rea. This modelling will be applied to the city of Toulouse and the result
 s will be compared to the measurements from the CAPITOUL campaign.\n 
LOCATION:GR B30
STATUS:CONFIRMED
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