Numerical investigation of the recirculation zone length upstream of the round-nosed broad crested weir

Kızılaslan M. A., Demirel E.

6th International Conference on Urban Design, Transportation, Architectural and EnvironmentalEngineering (UTAEE-17), İstanbul, Turkey, 8 - 10 September 2017, pp.1-6

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1-6
  • Çanakkale Onsekiz Mart University Affiliated: No

Abstract

Broad crested weirs (BCW) are widely used hydraulic structures in streams and irrigation channels to control the flow and to measure the discharge due to the advantage of having simple geometry. Interaction of the turbulent flow with the structure generates vortices and recirculation zone upstream of the weir, which may cause significant morphological changes on the stream bed. In this study, flow structure upstream of the roundnosed BCW is investigated based on two-dimensional Unsteady Reynolds-Averaged Navier-Stokes Simulations (URANS). Numerical simulations are conducted using OpenFOAM for different flow rates and rounding parameters of the weir. The Shear Stress Transport (SST) kthe adverse pressure gradients and separation effects accurately on the channel bottom and weir crest. Numerical results are reported and interpreted with focus on the effect of rounding on the length of the recirculation zone