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Advances in Science and Research Contributions in Applied Meteorology and Climatology
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Volume 10, issue 1
Adv. Sci. Res., 10, 33–41, 2013
https://doi.org/10.5194/asr-10-33-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Adv. Sci. Res., 10, 33–41, 2013
https://doi.org/10.5194/asr-10-33-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

  26 Feb 2013

26 Feb 2013

Large-Eddy Simulation of plume dispersion within various actual urban areas

H. Nakayama1, K. Jurcakova2, and H. Nagai1 H. Nakayama et al.
  • 1Japan Atomic Energy Agency, Ibaraki, Japan
  • 2Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

Abstract. Plume dispersion of hazardous materials within urban area resulting from accidental or intentional releases is of great concern to public health. Many researchers have developed local-scale atmospheric dispersion models using building-resolving computational fluid dynamics. However, an important issue is encountered when determining a reasonable domain size of the computational model in order to capture concentration distribution patterns influenced by urban surface geometries. In this study, we carried out Large-Eddy Simulations (LES) of plume dispersion within various urban areas with a wide range of obstacle density and building height variability. The difference of centerline mean and r.m.s. concentration distributions among various complex urban surface geometries becomes small for downwind distances from the point source greater than 1.0 km. From these results, it can be concluded that a length of a computational model should be at least 1.0 km from a point source.

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