Gaussian moment-conservation diffusion model

Journal Article · Thu Nov 01 04:00:00 EST 1979 · J. Appl. Meteorol.; (United States)

DOI:https://doi.org/10.1175/1520-0450(1979)018<1406:AGMCDM>2.0.CO;2· OSTI ID:5736099

Shannon, J D

A new method of solution of the advection-diffusion equation is developed; the key feature of the method is the approximate conservation of the zeroth, first and second moments of pollutant mass, with the assumption of Gaussian subgrid-scale distributions. Test cases used in evaluation of other numerical dispersion techniques are simulated with the Gaussian moment-conservation (GMC) model; the tests attempt to quantify numerical error and computation time requirements. The GMC technique is found to be computationally rapid and applicable to telescoping grid systems, and to model diffusion accurately. In a limited number of test cases, the GMC technique exhibits a phase speed lag of about 10%; with considerable pseudodiffusion and dispersion of short waves for the advective case when initial gradients are steep.

• Research Organization: Atmospheric Physics Section, Radiological and Environmental Research Division, Argonne National Laboratory, Argonne, IL 60439
• OSTI ID: 5736099
• Journal Information: J. Appl. Meteorol.; (United States), Journal Name: J. Appl. Meteorol.; (United States) Vol. 18:11; ISSN JAMOA
• Country of Publication: United States
• Language: English

Related Subjects

500100* -- Environment
Atmospheric-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics &amp; Computers
ADVECTION
AIR POLLUTION
COMPUTERIZED SIMULATION
DIFFUSION
FUNCTIONS
GAUSS FUNCTION
MASS TRANSFER
MOMENTS METHOD
NUMERICAL SOLUTION
POLLUTION
SIMULATION
TRANSPORT THEORY