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Type: Artigo de evento
Title: Numerical Investigation Of Channel Flows With Emphasis On Coherent Structures And Turbulence Anisotropy
Abstract: Numerical simulations of turbulent flows with pressure gradient effects are used to investigate the anisotropy of the Reynolds stress tensor near the wall and the presence of coherent structures. Incompressible, highly-resolved, Large Eddy Simulations (LES) are performed to investigate a convergent-divergent channel with a bump profile that induces a pressure gradient in the flow and a separation bubble. LES results are obtained using a semi-spectral formulation for low to moderate Reynolds numbers, ranging from Reτ = 180 to 950, based on the friction velocity at the channel inlet. The aim of this work is to analyse the effects of anisotropy along the channel using the Lumley triangle to evaluate the trajectories of the normalized Reynolds stress anisotropy tensor near the wall. This study is performed for different positions of the channel where favorable and adverse pressure gradients are present. Proper Orthogonal Decomposition (POD) is employed to isolate some coherent structures, reconstruct the flowfield and evaluate their effects in trajectories to isotropy. POD is also used to reconstruct the turbulent kinetic energy budget and to analyse the role of the large turbulent scales. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
Editor: American Institute of Aeronautics and Astronautics Inc, AIAA
Citation: 46th Aiaa Fluid Dynamics Conference. American Institute Of Aeronautics And Astronautics Inc, Aiaa, p. , 2016.
Rights: fechado
Identifier DOI: 
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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