Investigation of the flow behaviour and local scour around single square-shaped cylinders at different positions in live-bed

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Abstract

Scour around non-circular cylinders has seldom been studied before. This paper aims to numerically investigate the flow behaviour and evolution of local scour around two single square-shaped piers with 90° (square pier) and 45° (diamond pier) orientation angles to the flow under steady-current and live-bed conditions. For this purpose, a coupled approach between a hydrodynamic and a morphodynamic model is developed and validated against flow and scour experimental data sets. Hydrodynamic model simulations reveal the formation of strong horseshoe vortices (HSVs) upstream of the square pier compared to the diamond pier. The scour simulation results show a faster rate of increase in the scour depth around the square pier, which leads to a deeper equilibrium scour hole. The model gives values of normalized quasi-equilibrium scour depths of Seq/wp =1.94 and 1.00 for the square and diamond piers, respectively, where Seq is the quasi-equilibrium scour depth, and wp is the pier’s projected width under steady current flow and live-bed conditions. It was discovered that the impact of other factors, such as bed material gradation, Froude number, Shields Parameter, as well as flow depth, can be as important as the shape factor in the study of equilibrium scour depth in live-bed conditions.
Original languageEnglish
Article number109772
Number of pages12
JournalOcean Engineering
Volume238
Early online date2 Sept 2021
DOIs
Publication statusPublished - 15 Oct 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Flow field simulation
  • Numerical modelling
  • Scour
  • Sediment transport
  • Square pier

ASJC Scopus subject areas

  • Environmental Engineering
  • Ocean Engineering

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