Energy loss in steep open channels with step-pools

Suresh Kumar Thappeta, S. Murty Bhallamudi, Venu Chandra, Peter Fiener, Abul Basar M. Baki

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Three-dimensional numerical simulations were performed for different flow rates and various geometrical parameters of step-pools in steep open channels to gain insight into the occurrence of energy loss and its dependence on the flow structure. For a given channel with step-pools, energy loss varied only marginally with increasing flow rate in the nappe and transition flow regimes, while it increased in the skimming regime. Energy loss is positively correlated with the size of the recirculation zone, velocity in the recirculation zone and the vorticity. For the same flow rate, energy loss increased by 31.6% when the horizontal face inclination increased from 2 to 10, while it decreased by 58.6% when the vertical face inclination increased from 40 to 70 . In a channel with several step-pools, cumulative energy loss is linearly related to the number of step-pools, for nappe and transition flows. However, it is a nonlinear function for skimming flows.

Original languageEnglish
Article number72
JournalWater (Switzerland)
Volume13
Issue number1
DOIs
StatePublished - 1 Jan 2021

Keywords

  • Computational fluid dynamics
  • Energy loss
  • Flow regimes
  • Steep open channel
  • Steppool geometry

ASJC Scopus subject areas

  • Water Science and Technology
  • Geography, Planning and Development
  • Aquatic Science
  • Biochemistry

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