Editorial Type:
Article
Article Type:
Research Article

Micrometeorological Modeling of Radiative and Convective Effects with a Building-Resolving Code

Yongfeng Qu Teaching and Research Center in Atmospheric Environment (CEREA), Champs-sur-Marne, France

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Maya Milliez Teaching and Research Center in Atmospheric Environment (CEREA), Champs-sur-Marne, France

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Luc Musson-Genon Teaching and Research Center in Atmospheric Environment (CEREA), Champs-sur-Marne, France

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Bertrand Carissimo Teaching and Research Center in Atmospheric Environment (CEREA), Champs-sur-Marne, France

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Print Publication:
01 Aug 2011
DOI:
https://doi.org/10.1175/2011JAMC2620.1
Page(s):
1713–1724
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Abstract

In many micrometeorological studies with computational fluid dynamics, building-resolving models usually assume a neutral atmosphere. Nevertheless, urban radiative transfers play an important role because of their influence on the energy budget. To take into account atmospheric radiation and the thermal effects of the buildings in simulations of atmospheric flow and pollutant dispersion in urban areas, a three-dimensional (3D) atmospheric radiative scheme has been developed in the atmospheric module of the Code_Saturne 3D computational fluid dynamic model. On the basis of the discrete ordinate method, the radiative model solves the radiative transfer equation in a semitransparent medium for complex geometries. The spatial mesh discretization is the same as the one used for the dynamics. This paper describes ongoing work with the development of this model. The radiative scheme was previously validated with idealized cases. Here, results of the full coupling of the radiative and thermal schemes with the 3D dynamical model are presented and are compared with measurements from the Mock Urban Setting Test (MUST) and with simpler modeling approaches found in the literature. The model is able to globally reproduce the differences in diurnal evolution of the surface temperatures of the different walls and roof. The inhomogeneous wall temperature is only seen when using the 3D dynamical model for the convective scheme.

Corresponding author address: Yongfeng Qu, Teaching and Research Center in Atmospheric Environment (CEREA) (ENPC/EDF R&D), 6–8 avenue Blaise Pascal, 77455 Champs-sur-Marne, France. E-mail: yongfeng.qu@cerea.enpc.fr

Abstract

In many micrometeorological studies with computational fluid dynamics, building-resolving models usually assume a neutral atmosphere. Nevertheless, urban radiative transfers play an important role because of their influence on the energy budget. To take into account atmospheric radiation and the thermal effects of the buildings in simulations of atmospheric flow and pollutant dispersion in urban areas, a three-dimensional (3D) atmospheric radiative scheme has been developed in the atmospheric module of the Code_Saturne 3D computational fluid dynamic model. On the basis of the discrete ordinate method, the radiative model solves the radiative transfer equation in a semitransparent medium for complex geometries. The spatial mesh discretization is the same as the one used for the dynamics. This paper describes ongoing work with the development of this model. The radiative scheme was previously validated with idealized cases. Here, results of the full coupling of the radiative and thermal schemes with the 3D dynamical model are presented and are compared with measurements from the Mock Urban Setting Test (MUST) and with simpler modeling approaches found in the literature. The model is able to globally reproduce the differences in diurnal evolution of the surface temperatures of the different walls and roof. The inhomogeneous wall temperature is only seen when using the 3D dynamical model for the convective scheme.

Corresponding author address: Yongfeng Qu, Teaching and Research Center in Atmospheric Environment (CEREA) (ENPC/EDF R&D), 6–8 avenue Blaise Pascal, 77455 Champs-sur-Marne, France. E-mail: yongfeng.qu@cerea.enpc.fr
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