Parallelization of an Urban Microscale Flow Model (urbanSTREAM): Component 1 of CRTI Project 02-0093RD


  1. Lien, F-S.
  2. Hsieh, K-J.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Waterloo CFD Engineering Consulting Inc., Waterloo ON (CAN)
The provision of an efficient and accurate Computational Fluid Dynamics (CFD) solver for simulating flows within an urban complex on the microscale (with characteristic length scale extending to about 1-2 km) is required to support the development of an advanced atmospheric transport and diffusion multiscale modeling system for hazard assessment of chemical, biological, radiological or nuclear (CBRN) agents released within cities. The ultimate goal of this supporting effort is to construct a virtual test facility (VTF) that could eventually be used to develop guidelines and procedures for operating in the urban complex after a CBRN incident. Details of the numerical algorithms used for the "stand-alone" microscale CFD solver urbanSTREAM executing on serial computers have been described in the report entitled "Technical Description of Urban Microscale Modeling System: Component 1 of CRTI Project 02-0093RD" by E. Yee, F.-S. Lien and H. Ji (DRDC Suffield TR 2007-067). The objectives of this report are twofold. The first objective is to provide a description of the coupling of urbanSTREAM with an "urbanized" meso-gamma scale flow model (Global Environmental Multi-scale Local Area Model, or GEM LAM, developed by Canadian Meteorological Centre). A ''one-way interaction" scheme is adopted, which allows for the matching of velocity and turbulence field in any overlap region in a physically and mathematically consistent manner that preserves the physical conservation laws, mutually sa
Computational Fluid Dynamics;MPI parallelization;Urban Flow simulation;Urban Dispersion;Urban Flow Prediction
Report Number
DRDC-SUFFIELD-CR-2008-024 — Contractor Report
Date of publication
01 Dec 2007
Number of Pages

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