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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Large Eddy Simulations of convergent-divergent channel flows at moderate Reynolds numbers

Texto completo
Autor(es):
Schiavo, Luiz A. C. A. [1] ; Jesus, Antonio B. [2] ; Azevedo, Joao L. F. [3] ; Wolf, William R. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, BR-13083970 Campinas, SP - Brazil
[2] Inst Tecnol Aeronaut, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[3] Inst Aeronaut & Espago, BR-12228903 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW; v. 56, p. 137-151, DEC 2015.
Citações Web of Science: 3
Resumo

The paper is focused on the study of fully turbulent channel flows, using Large Eddy Simulations (LES), in order to address the effects of adverse pressure gradient regions. Analyses of the effects of streak instabilities, which have been shown to be relevant in such regions, are extended to moderate Reynolds numbers. The work considers two different channel geometries in order to further separate influences from wall curvature, flow separation and adverse pressure gradients. Turbulent kinetic energy and Reynolds stress budgets are investigated at separation and re-attachment points. The numerical approach used in the present work is based on the incompressible Navier-Stokes equations, which are solved by a pseudo-spectral methodology for structured grids. Wall-resolved LES calculations are performed using the WALE subgrid scale model. The study shows that the streak instability mechanism persists at higher Reynolds numbers with and without wall curvature in the adverse pressure gradient regions. Moreover, the observed effects are also present regardless of the existence of flow separation regions. Finally, the study of turbulent kinetic energy budgets indicates that, independently of the flow condition, there are well-defined patterns for such turbulent properties at separation and re-attachment points. (C) 2015 Elsevier Inc. All rights reserved. (AU)

Processo FAPESP: 13/03413-4 - Investigação da geração e propagação de ruído em configurações aerodinâmicas utilizando aeroacústica computacional
Beneficiário:William Roberto Wolf
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 13/07375-0 - CeMEAI - Centro de Ciências Matemáticas Aplicadas à Indústria
Beneficiário:José Alberto Cuminato
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 14/07623-6 - Estudo numérico do efeito de uma perturbação geométrica em escoamentos turbulentos
Beneficiário:Luiz Augusto Camargo Aranha Schiavo
Linha de fomento: Bolsas no Brasil - Doutorado