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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A large eddy simulation model applied to analyze the turbulent flow above Amazon forest

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Author(s):
Dias-Junior, Cleo Q. [1, 2] ; Marques Filho, Edson P. [3] ; Sa, Leonardo D. A. [4]
Total Authors: 3
Affiliation:
[1] Fed Inst Educ Sci & Technol Para Braganca, Braganca Paulista, SP - Brazil
[2] Natl Inst Amazonian Res CLIAMB, Manaus, Amazonas - Brazil
[3] Univ Fed Bahia, Salvador, BA - Brazil
[4] Natl Inst Space Res CRA, Belem, Para - Brazil
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS; v. 147, p. 143-153, DEC 2015.
Web of Science Citations: 6
Abstract

The occurrence of coherent structures (CS) above the Amazon forest is analyzed. To perform this study, a large eddy simulation (LES) model is used, which has been improved by the introduction of a drag force which is representative of a typical Amazon forest canopy. The results show that the flow is sensitive to the presence of canopy and an inflexion point is simulated in wind profiles. On the region between 1 h and 4h several CS features associated with turbulent flow regarding pressure, momentum fluxes, skewness and voracity fields are detected suggesting that ``roll{''} structures arranged perpendicularly to the mean wind direction populate this region. Other interesting LES results were: (i) the skewness of the wind velocity has also a maximum value on the region, what indicates an asymmetric distribution of the wind velocity relatively to its mean value, a fact that might be associated with the generation process of the ``roll{''} structures; (ii) the horizontal voracity component transversal to the mean wind direction is greater than the voracity components on the other orthogonal directions suggesting that ``roll{''} structures move perpendicularly to the mean wind direction. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 01/06908-7 - Radiation, cloud and climate interactions in the Amazon during the Dry-To-Wet transition season/LBA
Grantee:Maria Assunção Faus da Silva Dias
Support Opportunities: Research Projects - Thematic Grants