Accession Number : ADA132613

Title :   Transport and Diffusion of Buoyant Material.

Descriptive Note : Final rept.,

Corporate Author : ARMY ELECTRONICS RESEARCH AND DEVELOPMENT COMMAND WSMR NM ATMOSPHERIC SCIENCES LAB

Personal Author(s) : Cogan,James L

PDF Url : ADA132613

Report Date : May 1983

Pagination or Media Count : 46

Abstract : Transport and diffusion of dust and nonbuoyant smokes are simulated realistically by the particle model originally developed at the US Army Atmospheric Sciences Laboratory by Ohmstede and Stenmark. A new and simple algorithm accounts for buoyant smokes and/or dust. This technique uses the difference in temperature between individual particles and the ambient atmosphere to compute an additional vertical acceleration. The technique takes into consideration entrainment at the sides and top of the cloud, as well as the ingestion of unheated material at, or loss of heat by contact with, the ground during initial release and during subsequent surface contact. Some sample computer runs suggest that the particle model with this new algorithm can model realistically the transport and diffusion of buoyant material. (Author)

Descriptors :   *Particles, *Transport, Dust, Smoke, Buoyancy, Diffusion, Velocity, Entrainment, Cooling, Mathematical models, Computerized simulation

Subject Categories : Meteorology
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE