Backflow events under the effect of secondary flow of Prandtl's first kind
Chin RC, Vinuesa R, Orlu R, Cardesa J, Noorani A, Chong MS, Schlatter P (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 5
Article Number: 074606
Journal Issue: 7
DOI: 10.1103/PhysRevFluids.5.074606
Abstract
A study of the backflow events in the flow through a toroidal pipe at friction Reynolds number Reτ≈ 650 is performed and compared with the results in a straight turbulent pipe flow at Reτ≈ 500. The statistics and topological properties of the backflow events are analysed and discussed. Conditionally averaged flow fields in the vicinity of the backflow event are obtained, and the results for the torus show a similar streamwise wall-shear stress topology which varies considerably for the azimuthal wall-shear stress when compared to the pipe flow. In the region around the backflow events, critical points are observed. The comparison between the toroidal pipe and its straight counterpart also shows fewer backflow events and critical points in the torus. This is attributed to the secondary flow of Prandtl's first kind present in the toroidal pipe, which is responsible for the convection of momentum from the inner to the outer bend through the core of the pipe, and back from outer bend to the inner bend along the azimuthal direction. These results indicate that backflow events and critical points are genuine features of wall-bounded turbulence, and are not artefacts of specific boundary or inflow conditions in simulations and/or measurement uncertainties in experiments
Authors with CRIS profile
Involved external institutions
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
University of Adelaide
Australia (AU)
Université Fédérale de Toulouse Midi-Pyrénées
France (FR)
The University of Melbourne
Australia (AU)
Sweden (SE)
University of Adelaide
Australia (AU)
Université Fédérale de Toulouse Midi-Pyrénées
France (FR)
The University of Melbourne
Australia (AU)
How to cite
APA:
Chin, R.C., Vinuesa, R., Orlu, R., Cardesa, J., Noorani, A., Chong, M.S., & Schlatter, P. (2020). Backflow events under the effect of secondary flow of Prandtl's first kind. Physical Review Fluids, 5(7). https://doi.org/10.1103/PhysRevFluids.5.074606
MLA:
Chin, R. C., et al. "Backflow events under the effect of secondary flow of Prandtl's first kind." Physical Review Fluids 5.7 (2020).
BibTeX: Download