TRAJECTORY-GRID - AN ACCURATE SIGN-PRESERVING ADVECTION-DIFFUSION APPROACH FOR AIR-QUALITY MODELING

Citation
Dp. Chock et al., TRAJECTORY-GRID - AN ACCURATE SIGN-PRESERVING ADVECTION-DIFFUSION APPROACH FOR AIR-QUALITY MODELING, Atmospheric environment, 30(6), 1996, pp. 857-868
Citations number
10
Categorie Soggetti
Environmental Sciences","Metereology & Atmospheric Sciences
Journal title
ISSN journal
13522310
Volume
30
Issue
6
Year of publication
1996
Pages
857 - 868
Database
ISI
SICI code
1352-2310(1996)30:6<857:T-AASA>2.0.ZU;2-U
Abstract
We propose a new method, called the trajectory-grid (T-G) approach, wh ich contains a fully Lagrangian advection scheme coupled with an Euler ian diffusion scheme, to remove the numerical problems associated with the advection equation in air quality modeling. This method is sign p reserving, mass conserving, and very accurate. The method assigns the spatial locations of points on a given concentration profile to a set of concentration pulses; then tracks the pulse positions as they move downwind undergoing diffusion and reactions. Multigrid nesting can be conveniently accounted for by increasing the number density of concent ration pulses in given areas in the modeling domain. The method can al so serve as a tool to test the validity of the observation-based model s. While the execution time may be comparable to that of the Accurate Space Derivative scheme, the advection step of the method is highly am enable to multiply-parallel processing.