A simulation tool has been developed to simulate the wind fields, turbulence fields, and the unsteady dispersion of NCBR substances in urban areas on the building to city blocks scale. This Computational Fluid Dynamics (CFD)-based approach has been shown to accurately simulate the urban wind and turbulence fields with minimal approximations, and has been demonstrated by modeling the flow fields and simulated release of CBW agent near the Lafayette Park, Washington DC. This note outlined the modeling approaches taken, including both CFD and solid model generation, and showed results comparing computed and experimental data for the flow over obstacle arrays simulating the urban environment. The UDS is being further developed under an SBIR Phase Ⅱ contract with the Defense Threat Reduction Agency.
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