A One-dimensional vertical diffusion parameter for extremely inhomogeneous, layered turbulence in stratified fluids /
Edmond M. Dewan.

Description

Main Author

Dewan, Edmond M., 1931-

Related Names

U.S. Air Force Geophysics Laboratory.

Language(s)

English

Published

Hanscom AFB, Massachusetts : Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, 1980.

Subjects

Turbulent diffusion (Meteorology)
Stratosphere.
Fluid dynamics.
Differential equations.
Computer simulation.
Differential equations.
Computer simulation.
Stratosphere.
Fluid dynamics.
Turbulent diffusion (Meteorology)

Summary

A self-consistent method of characterizing vertical turbulent transport by means of a diffusion parameter is demonstrated for the extremely inhomogeneous case of layered turbulence in a stratified fluid. Between the horizontal turbulent layers, horizontal laminar flow is assumed to occur, and molecular diffusion is ignored. The layers are assumed to occur at random heights with random thickness. An analogy is made between the process of random mixing layers and the finite difference representation of the diffusion equation. It is demonstrated by means of a series of digital computer experiments that, in the case where total mixing takes place within the turbulent layers, the diffusion parameter herein developed is the valid one to use (in contrast to 'eddy diffusivity'). The relation between this inhomogeneous diffusion parameter and practical experimental measurements is given. The motive behind this investigation involves vertical transport of pollution in the environment in general and in the stratosphere in particular.

Note

Research supported by the Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, Hanscom AFB, Massachusetts.
Aeronomy Division Project 6687.
ADA090340 (from http://www.dtic.mil).
"16 June 1980."

Physical Description

51 pages : illustrations ; 28 cm.

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