Turbulent pipe flow downstream of a 90° bend

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

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42 Scopus citations


Time-resolved stereoscopic PIV was used to investigate the curvature-induced structures downstream of a 90° bend at Reynolds numbers between 20× 103 and 115× 103. Data were taken at three downstream locations to investigate the evolution of the structures. Snapshot proper orthogonal decomposition (POD) analysis shows that the most energetic structure is not the well-known Dean motion but a bimodal single cell structure with alternating direction of rotation, called the 'swirl switching' mode. The strengths of the Dean motion and the swirl-switching structures are similar, indicating that the difference in energy is related to their duration of occurrence, where the Dean motion is associated with a comparatively rapid transition between the two states in the swirl switching mode.

Original languageEnglish (US)
Pages (from-to)R7
JournalJournal of Fluid Mechanics
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics


  • low-dimensional models
  • turbulent boundary layers
  • vortex dynamics


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