Fourth Symposium on the Urban Environment
12th Joint Conference on the Applications of Air Pollution Meteorology with the Air and Waste Management Association
25th Conference on Agricultural and Forest Meteorology


Development of a Dispersion Model for Flow around Buildings

Michael D. Williams, LANL, Los Alamos, NM; and M. J. Brown and E. M. Pardyjak

There is a need for a model that can quickly describe the dispersion of materials released near buildings. Buildings produce complex flows that pose difficult challenges to dispersion modelers. This paper describes the development and testing of a new tool, the QWIC-PLUME, model that can be used to describe dispersion near buildings. The model is designed to be used with the QWIC-URB model that computes a mass consistent wind field for flows around buildings.

The QWIC-PLUME model is a Langevin equation model that describes the dispersion and transport of releases. Gradients in the wind fields are used to estimate the dissipation which is associated with the random forcing acting on particles that are transported with the instantaneous winds. The paper describes the techniques used to estimate dissipation, drift corrections, and reflection of particles. Comparisons with wind tunnel measurements and more computationally intensive model results are also described.

extended abstract  Extended Abstract (548K)

Joint Session 1, Flow and dispersion studies: building, street canyon (measurement and modeling) (Joint with the Fourth Symp. Urban Environment, 12th Joint Conf. on the Applications of Air Pollution Meteorology with A&WMA, and 25th Conf. Agricultural & Forest Meterology)
Tuesday, 21 May 2002, 8:30 AM-12:15 PM

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