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Main Title Development of a Simulation Model for Estimating Ground Level Concentrations of Photochemical Pollutants. Appendix D. Numerical Integration of the Continuity Equations.
Author Reynold, Steven D. ;
CORP Author Systems Applications, Inc., Beverly Hills, Calif.
Year Published 1971
Report Number 71SAI-21; CPA-70-148; 0911;
Stock Number PB-206 412
Additional Subjects ( Air pollution ; Atmospheric models) ; ( Smog ; Atmospheric models) ; ( Atmospheric motion ; Air pollution) ; Atmospheric composition ; Urban areas ; Mathematical models ; Carbon monoxide ; Applications of mathematics ; California ; Numerical integration ; Finite difference theory ; Los Angeles(California)
Library Call Number Additional Info Location Last
NTIS  PB-206 412 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 28p
The simulation model for estimating ground level concentrations of photochemical pollutants is based on the equations of continuity for a turbulent fluid in which chemical reactions occur. A variant of the method of fractional steps is based on the repeated but separate solution of three two-dimensional problems--in (x,t), (y,t), and (z, t) space--at each time step. Experience indicates that the procedure (with second or fourth-order approximation included) is stable and poses no particular computational difficulties. The basis for the selection of the numerical technique adopted is discussed. A detailed exposition of the method is given. The discussion is concluded with an evaluation of the procedure and a summary of experience with its use.