Development and Implementation of Advanced Modeling Capabilities in Support of “Towards an Operational Urban Modeling System for CBRN Emergency Response and Preparedness”


  1. Li, M.
  2. Hsieh, K-J.
  3. Ji, H.
  4. Lien, F-S.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Waterloo CFD Engineering Consulting Inc., Waterloo ON (CAN)
In our previous Chemical, Biological, Radiological-Nuclear and Explosives Research and Technology Initiative (CRTI) Project 02-0093RD, a prototype high-fidelity multiscale hazard modeling system was developed for the prediction of atmospheric flows in the urban environment and of dispersion of Chemical, Biological, Radiological and Nuclear (CBRN) agents released into these flows. The objective of this report is to provide a technical description of our recent development, specifically in the area of microscale Computational Fluid Dynamics (CFD) modeling, in order to transition the R&D model prototype developed in 02-0093RD to a demonstration operational system that will be fully functional in a government operations facility at Environment Canada’s Environmental Emergency Response Section (EC-EERS) at Canadian Meteorological Centre in Dorval. The enhancement of the microscale CFD code urbanSTREAM consists of: 1) inclusion of thermal effects (e.g., positive and negative buoyancy) on flow and dispersion in urban canyons; 2) development of a radiation module (urbanRAD) to enable temperature on the building surfaces to be determined, and the full integration of this new module with urbanSTREAM; 3) integration of the Eulerian dispersion model urbanEU with the flow solver urbanSTREAM to enable improved predictions of dispersion for unsteady wind flow conditions; 4) verification and validation of new components of the modeling system; 5) coupling of integrated urbanSTREAM/urbanRAD
computational fluid dynamics;urban flow;urban dispersion
Report Number
DRDC-RDDC-2016-C296 — Contract Report
Date of publication
01 Mar 2012
Number of Pages
Electronic Document(PDF)

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