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Parallelization Performances of PMSS Flow and Dispersion Modeling System over a Huge Urban Area

1
MOKILI, F-75014 Paris, France
2
CEA DAM DIF, F-91219 Arpajon, France
3
AmpliSIM, F-75014 Paris, France
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(7), 404; https://doi.org/10.3390/atmos10070404
Received: 17 May 2019 / Revised: 8 July 2019 / Accepted: 11 July 2019 / Published: 16 July 2019
(This article belongs to the Special Issue Atmospheric Dispersion of Pollutants in Urban Environments)
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Abstract

The use of modeling as a support tool for crisis management and decision planning requires fast simulations in complex built-up areas. The Parallel Micro SWIFT SPRAY (PMSS) modeling system offers a tradeoff between accuracy and fast calculations, while retaining the capability to model buildings at high resolution in three dimensions. PMSS has been applied to actual areas of responsibilities of emergency teams during the EMERGENCIES (very high rEsolution eMERGEncy simulatioN for citIES) and EMED (Emergencies for the MEDiterranean sea) projects: these areas cover several thousands of square kilometers. Usage of metric meshes on such large areas requires domain decomposition parallel algorithms within PMSS. Sensitivity and performance of the domain decomposition has been evaluated both for the flow and dispersion models, using from 341 up to 8052 computing cores. Efficiency of the Parallel SWIFT (PSWIFT) flow model on the EMED domain remains above 50% for up to 4700 cores. Influence of domain decomposition on the Parallel SPRAY (PSPRAY) Lagrangian dispersion model is less straightforward to evaluate due to the complex load balancing process. Due to load balancing, better performance is achieved with the finest domain decomposition. PMSS is able to simulate accidental or malevolent airborne release at high resolution on very large areas, consistent with emergency team responsibility constrains, and with computation time compatible with operational use. This demonstrates that PMSS is an important asset for emergency response applications. View Full-Text
Keywords: parallel modeling; PMSS modeling system; domain decomposition; built-up area; atmospheric flow and dispersion; crisis management parallel modeling; PMSS modeling system; domain decomposition; built-up area; atmospheric flow and dispersion; crisis management
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Oldrini, O.; Armand, P.; Duchenne, C.; Perdriel, S. Parallelization Performances of PMSS Flow and Dispersion Modeling System over a Huge Urban Area. Atmosphere 2019, 10, 404.

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