Journal article

Backflow events under the effect of secondary flow of Prandtl's first kind

RC Chin, R Vinuesa, R Orlu, J Cardesa, A Noorani, MS Chong, P Schlatter

Physical Review Fluids | American Physical Society | Published : 2020

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 ..

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Grants

Awarded by Coturb Grant of the European Research Council


Funding Acknowledgements

This work was supported with supercomputing resources provided by the Phoenix HPC service at the University of Adelaide. In addition, computer time was provided by the Swedish National Infrastructure for Computing (SNIC). This study was funded in part by the Coturb Grant (Grant No. ERC-2014.AdG-669505) of the European Research Council. R.C.C. acknowledges the financial support of the Australian Research Council. R.V., R.O., and P.S. acknowledge the funding provided by the Swedish Research Council (VR) and the Knut and Alice Wallenberg Foundation.