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Communication Dans Un Congrès Année : 2020

Development of BUILD (Building Urban and Industrial Lagrangian Dispersion), a new operational dispersion model for accidental or deliberate releases in complex area

Résumé

The release of CBRN toxic substances (Chemical, Biological, Radiological and Nuclear) into the atmosphere is an important issue for the safety of people and the protection of infrastructures, more specifically in the case of accidental or deliberate release within an urban or industrial complex-built area. In order to be able to react quickly and take decisions, first responders, public authorities and industrial companies need operational simulation tools for emergency situations. This paper presents the development and the physical parameterizations of a new operational dispersion model, called BUILD (Building Urban and Industrial Lagrangian Dispersion model), which is dedicated to simulate the transport of CBRN pollutants in complex built area. The BUILD model uses a geometrical preprocessor which converts 3D urban geometrical databases into 2D tiles of pre-calculated information on the street canyons, their connectivity and the recirculations in the wake of buildings. The BUILD flow model is based on a “SIRANE like” parametrization for the dense part of an urban area (Soulhac et al., 2011, 2012). Nevertheless, the flow model has been enhanced to consider the recirculating transverse component of the flow in each street and a three-dimensional diagnostic flow model in the roughness sublayer, to take into account the deviation by buildings and obstacles. In order to represent obstacles and buildings in sparse areas (isolated roughness regime), the BUILD model uses an analytical building wake parametrization to describe the recirculating flow downwind of a building. The transport and dispersion of pollutants are solved using a Lagrangian particles stochastic approach coupled with the simplified flow defined above. This new operational model is able to simulate the dispersion from a point source in a complex built area in a computational time less than one minute on a laptop. The present paper describes the physical parameterizations of the model and their calibration. A companion paper (Slimani et al., Harmo20) presents in more detail the validation against wind tunnel data and CFD RANS and LES simulations on obstacles and streets network configurations. © 2020 HARMO. All rights reserved.
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hal-03832369 , version 1 (27-10-2022)

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  • HAL Id : hal-03832369 , version 1

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Lionel Soulhac, Guillevic Lamaison, P. Volta, Mehdi Slimani, Patrick Armand, et al.. Development of BUILD (Building Urban and Industrial Lagrangian Dispersion), a new operational dispersion model for accidental or deliberate releases in complex area. 20th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2020, Jun 2020, Tartu, Estonia. ⟨hal-03832369⟩
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