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Hybrid Methods in Engineering

ISSN Druckformat: 1099-2391
ISSN Online: 2641-7359

Archives: Volume 1, 1999 to Volume 4, 2002

Hybrid Methods in Engineering

DOI: 10.1615/HybMethEng.v2.i3.80
14 pages

DERIVATION OF EDDY DIFFUSIVITIES DEPENDING ON THE SOURCE DISTANCE

Gervasio Annes Degrazia
Departamento de Fisica, Universidade Federal de Santa Maria, Santa Maria; Consiglio Nazionale delle Ricerche, lstituto di Cosmo-Geofisica, Torino, Italy; and Universidade de Sao Paulo, Institute Astrondmico e Geofisico, Sao Paulo, Brazil
Claudia Rejane Jacondino de Campos
Departamento de Meteorologia, Universidade Federal de Pelotas, Pelotas, Brazil
Marco Tulio de Vilhena
Departamento de Engenharia Mecânica, Universidade Federal do Rio Grande do Sul

ABSTRAKT

A new method for deriving the eddy diffusivities for inhomogeneous turbulence in the convective boundary layer (CBL) is described. The formulation relies on Taylor classic diffusion theory and observed turbulent spectral properties and as a consequence represents a hybrid method to obtain these eddy diffusivities. The vertical eddy diffusivities depending on the source distance are described in terms of the frequency of spectral peak and dissipation function. As a consequence, they are directly related to the energy-containing eddies originated by convective production. The new parameterization is well suited for application in air pollution modeling under unstable conditions.


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