Turbulent pipe flow through a 90° bend

Leo H.O. Hellström, Metodi B. Zlatinov, Alexander J. Smits, Guongjun Cao

Research output: Contribution to conferencePaper

6 Scopus citations

Abstract

Stereoscopic PIV is used to investigate the structure of fully developed turbulent pipe-flow through a 90° bend. The results show that Dean motions downstream of the bend are very weak in the mean, and time resolved stereoscopic PIV demonstrates that the Dean motions co-exist with large scale swirling motions that switch sign and do not contribute to the mean. Snapshot POD analysis of the flow field reveals that the structures found upstream of the bend persist after the bend and survive the strong secondary motions induced by the pipe curvature. In particular, the Very Large Scale Motions (VLSM) are no longer the most energetic mode in the flow, but they are still the most energetic structure in terms of the streamwise fluctuations.

Original languageEnglish (US)
StatePublished - Jan 1 2011
Event7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada
Duration: Jul 28 2011Jul 31 2011

Other

Other7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011
CountryCanada
CityOttawa
Period7/28/117/31/11

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

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    Hellström, L. H. O., Zlatinov, M. B., Smits, A. J., & Cao, G. (2011). Turbulent pipe flow through a 90° bend. Paper presented at 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011, Ottawa, Canada.