Publication detail

Computational Modelling of Airflow in Urban Street Canyon and Comparison With Measurements

JÍCHA, M. POSPÍŠIL, J. Niachou, A. Santamouris. M.

Original Title

Computational Modelling of Airflow in Urban Street Canyon and Comparison With Measurements

English Title

Computational Modelling of Airflow in Urban Street Canyon and Comparison With Measurements

Type

conference paper

Language

en

Original Abstract

Residential buildings in cities are ventilated using different systems of ventilation. Except systems that consist in opening windows there are more sophisticated systems that are controlled by different manners. Among them, hybrid systems are recently gaining more attention as they promise to be energy effective with a good control of indoor air quality. Operation of such ventilation systems can be significantly influenced by airflow in street canyons. Thus, correct prediction of airflow is a prerequisite for a good function of such systems. Authors of this paper choose Agiou Fanouriou street canyon in Athens as a test canyon for comparison of modeling and field measurements. Computational model of the street canyon was formed with several blocks of buildings on each side of the canyon according to the actual situation. Three different directions of wind were assumed, namely perpendicular, oblique under the angle of 45 and parallel with speeds of 3m/s and 6m/s at the height of 25m above the ground level. Computational modeling was done for three different turbulence models, namely K-e Hi-Re, K-e RNG and K-e Lo-Re. Two different types of boundary conditions were tested: a) velocity profile for neutral stratification assigned at all inlet boundaries and b) velocity of wind assigned at the height where the wind velocity was measured.

English abstract

Residential buildings in cities are ventilated using different systems of ventilation. Except systems that consist in opening windows there are more sophisticated systems that are controlled by different manners. Among them, hybrid systems are recently gaining more attention as they promise to be energy effective with a good control of indoor air quality. Operation of such ventilation systems can be significantly influenced by airflow in street canyons. Thus, correct prediction of airflow is a prerequisite for a good function of such systems. Authors of this paper choose Agiou Fanouriou street canyon in Athens as a test canyon for comparison of modeling and field measurements. Computational model of the street canyon was formed with several blocks of buildings on each side of the canyon according to the actual situation. Three different directions of wind were assumed, namely perpendicular, oblique under the angle of 45 and parallel with speeds of 3m/s and 6m/s at the height of 25m above the ground level. Computational modeling was done for three different turbulence models, namely K-e Hi-Re, K-e RNG and K-e Lo-Re. Two different types of boundary conditions were tested: a) velocity profile for neutral stratification assigned at all inlet boundaries and b) velocity of wind assigned at the height where the wind velocity was measured.

Released

01.06.2004

Publisher

Forschungszentrum Karlsruhe GmbH

Location

Garmisch-Partenkirchen, Germany

ISBN

3-923704-45-3

Book

Harmonisation within Atmospheric Dispersion Modeling for Regulatory Purposes - vol.2

Pages from

60

Pages to

64

Pages count

5

BibTex


@inproceedings{BUT12701,
  author="Miroslav {Jícha} and Jiří {Pospíšil}",
  title="Computational Modelling of Airflow in Urban Street Canyon and Comparison With Measurements",
  annote="Residential buildings in cities are ventilated using different systems of ventilation. Except systems that consist in opening windows there are more sophisticated systems that are controlled by different manners. Among them, hybrid systems are recently gaining more attention as they promise to be energy effective with a good control of indoor air quality. Operation of such ventilation systems can be significantly influenced by airflow in street canyons. Thus, correct prediction of airflow is a prerequisite for a good function of such systems. Authors of this paper choose Agiou Fanouriou street canyon in Athens as a test canyon for comparison of modeling and field measurements. 
Computational model of the street canyon was formed with several blocks of buildings on each side of the canyon according to the actual situation. Three different directions of wind were assumed, namely perpendicular, oblique under the angle of 45  and parallel with speeds of 3m/s and 6m/s at the height of 25m above the ground level. Computational modeling was done for three different turbulence models, namely K-e Hi-Re, K-e RNG and K-e Lo-Re. Two different types of boundary conditions were tested: a) velocity profile for neutral stratification assigned at all inlet boundaries and b) velocity of wind assigned at the height where the wind velocity was measured.",
  address="Forschungszentrum Karlsruhe GmbH",
  booktitle="Harmonisation within Atmospheric Dispersion Modeling for Regulatory Purposes - vol.2",
  chapter="12701",
  institution="Forschungszentrum Karlsruhe GmbH",
  year="2004",
  month="june",
  pages="60",
  publisher="Forschungszentrum Karlsruhe GmbH",
  type="conference paper"
}