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

Autor(es)

Dias-Junior, Cleo Q. ^{[1, 2]} ; Marques Filho, Edson P. ^[3] ; Sa, Leonardo D. A. ^[4]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS; v. 147, p. 143-153, DEC 2015.
• Citações Web of Science: 6

Resumo

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)

• Processo FAPESP: 01/06908-7 - Interações entre radiação, nuvens e clima na Amazônia na transição entre as estações seca e chuvosa/LBA
• Beneficiário: Maria Assunção Faus da Silva Dias
• Modalidade de apoio: Auxílio à Pesquisa - Temático