Transitional and turbulent bent pipes
Schlatter P, Noorani A, Canton J, Hufnagel L, Orlu R, Marin O, Merzari E (2017)
Publication Type: Conference contribution
Publication year: 2017
Publisher: Springer Science and Business Media, LLC
Book Volume: 196
Pages Range: 81-87
Conference Proceedings Title: Springer Proceedings in Physics
Event location: Bertinoro, ITA
ISBN: 9783319579337
DOI: 10.1007/978-3-319-57934-4_12
Abstract
We review a number of aspects of the transitional and turbulent flow in bent pipes, obtained at KTH using the spectral-element code Nek5000. This flow, sometimes also called Dean flow, is characterised by the appearance of Dean vortices, which arise due to the action of the centrifugal force in the bend. We start with reviewing recent stability analysis in the toroidal flow, and conclude that for all curvatures δ>0 an exponential instability is present at a bulk Reynolds number of about 4000. Further increasing the Reynolds number lets the flow go through a region with potential sub straight and sublaminar drag. An analysis using proper orthogonal decomposition (POD) reveals that wave-like motions are still present in the otherwise turbulent flow. Upon further increasing Re, the in-plane Dean vortices lead to a modulation of turbulence depending on the azimuthal position. The flow is then dominated by low-frequency so-called swirl-switching motion. This motion is studied in both a periodic and spatially developing framework. Finally, the effect of Dean vortices on Lagrangian inertial particles is studied.
Authors with CRIS profile
Involved external institutions
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
Argonne National Laboratory
United States (USA) (US)
Sweden (SE)
Argonne National Laboratory
United States (USA) (US)
How to cite
APA:
Schlatter, P., Noorani, A., Canton, J., Hufnagel, L., Orlu, R., Marin, O., & Merzari, E. (2017). Transitional and turbulent bent pipes. In Ramis Orlu, Alessandro Talamelli, Martin Oberlack, Joachim Peinke (Eds.), Springer Proceedings in Physics (pp. 81-87). Bertinoro, ITA: Springer Science and Business Media, LLC.
MLA:
Schlatter, Philipp, et al. "Transitional and turbulent bent pipes." Proceedings of the 7th iTi Conference on Turbulence, 2016, Bertinoro, ITA Ed. Ramis Orlu, Alessandro Talamelli, Martin Oberlack, Joachim Peinke, Springer Science and Business Media, LLC, 2017. 81-87.
BibTeX: Download