Numerical simulations of turbulent flow around side-by-side circular piles with different spacing ratios

Ali Asghar Beheshti, Behzad Ataie-Ashtiani, Hamed Dashtpeyma

Research output: Contribution to journalArticle

Abstract

Numerical simulations of the turbulent flow around single and side-by-side piles at different spacing ratios (centre-to-centre distance to the pile diameter) with flow Reynolds number of 105 on the fixed flat-bed are presented. The calculations are performed using the computational fluid dynamics model, FLOW-3D, which solves the Navier–Stokes equations in three dimensions with a finite-volume method. The numerical results of time-averaged flow patterns around single and side-by-side piles are validated using the available experimental measurements. At the downstream of the single pile, dimensionless vortex shedding frequency (Strouhal number) is estimated as 0.22. The maximum values of bed shear stress around side-by-side piles at different spacing ratios are compared with the maximum values obtained for the single pile. Interactions of horseshoe vortices on different cases of side-by-side piles are studied. Numerical results show that the critical arrangement for which the largest bed shear stress was observed is the case with the spacing ratio of 3.

Original languageEnglish
Pages (from-to)227-238
Number of pages12
JournalInternational Journal of River Basin Management
Volume15
Issue number2
DOIs
Publication statusPublished - 3 Apr 2017
Externally publishedYes

Keywords

  • computational fluid dynamics
  • flow patterns
  • side-by-side piles
  • turbulent flow

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