Characterization of turbulent coherent structures in square duct flow
Atzori M, Vinuesa R, Lozano-Duran A, Schlatter P (2018)
Publication Type: Conference contribution
Publication year: 2018
Publisher: Institute of Physics Publishing
Book Volume: 1001
Conference Proceedings Title: Journal of Physics: Conference Series
Event location: Madrid, ESP
DOI: 10.1088/1742-6596/1001/1/012008
Abstract
This work is aimed at a first characterization of coherent structures in turbulent square duct flows. Coherent structures are defined as connected components in the domain identified as places where a quantity of interest (such as Reynolds stress or vorticity) is larger than a prescribed non-uniform threshold. Firstly, we qualitatively discuss how a percolation analysis can be used to assess the effectiveness of the threshold function, and how it can be affected by statistical uncertainty. Secondly, various physical quantities that are expected to play an important role in the dynamics of the secondary flow of Prandtl's second kind are studied. Furthermore, a characterization of intense Reynolds-stress events in square duct flow, together with a comparison of their shape for analogous events in channel flow at the same Reynolds number, is presented.
Authors with CRIS profile
Involved external institutions
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
Stanford University
United States (USA) (US)
Sweden (SE)
Stanford University
United States (USA) (US)
How to cite
APA:
Atzori, M., Vinuesa, R., Lozano-Duran, A., & Schlatter, P. (2018). Characterization of turbulent coherent structures in square duct flow. In Javier Jimenez (Eds.), Journal of Physics: Conference Series. Madrid, ESP: Institute of Physics Publishing.
MLA:
Atzori, Marco, et al. "Characterization of turbulent coherent structures in square duct flow." Proceedings of the 3rd Madrid Summer School on Turbulence, Madrid, ESP Ed. Javier Jimenez, Institute of Physics Publishing, 2018.
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