6.1
A Fast-Running Urban Airflow Model
Donald A. Burrows, ITT Industries/Advanced Engineering and Sciences, Colorado Springs, CO; and R. Keith, S. Diehl, and E. Hendricks
A fast-running urban airflow model, RUSTIC (Realistic Urban Spread and Transport of Intrusive Contaminants), has been developed to fill a gap between CFD and mass-consistent flow models. To simplify computation the continuity and thermodynamic equations are combined into a single pressure tendency equation. RUSTIC also includes a k-w turbulence model, and atmospheric stability effects.
RUSTIC uses a modified Cartesian grid structure and the solution is obtained using the finite-volume technique. An automated grid generation routine is available for generating grids from a variety of terrain and building model data files.
Comparisons with wind tunnel data show that RUSTIC is capable of performing as well as more complex models. A technique for running RUSTIC with several different grids of increasing finer resolution is being developed with the goal of providing rapid convergence to a “useful” solution within as short of a period of time as possible.
.Session 6, Advanced Dispersion Modeling
Tuesday, 24 August 2004, 10:30 AM-11:45 AM
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