Effect of the junction angle on turbulent flow at a hydraulic confluence

Enrico Napoli, Mauro De Marchis, Nadia Penna, Olga B. Canelas, Olga B. Canelas, Olga B. Canelas, Roberto Gaudio, António H. Cardoso

Risultato della ricerca: Articlepeer review

14 Citazioni (Scopus)


Despite the existing knowledge concerning the hydrodynamic processes at river junctions, there is still a lack of information regarding the particular case of low width and discharge ratios, which are the typical conditions of mountain river confluences. Aiming at filling this gap, laboratory and numerical experiments were conducted, comparing the results with literature findings. Ten different confluences from 45° to 90° were simulated to study the effects of the junction angle on the flow structure, using a numerical code that solves the 3D Reynolds Averaged Navier-Stokes (RANS) equations with the k-ε turbulence closure model. The results showed that the higher the junction angle, the wider and longer the retardation zone at the upstream junction corner and the separation zone, and the greater the flow deflection at the entrance of the tributary into the post-confluence channel. Furthermore, it was shown that the maximum streamwise velocity does not necessarily increase with the junction angle and that it is not always located in the contraction section.
Lingua originaleEnglish
pagine (da-a)1-23
Numero di pagine23
Stato di pubblicazionePublished - 2018

All Science Journal Classification (ASJC) codes

  • ???subjectarea.asjc.3300.3305???
  • ???subjectarea.asjc.1300.1303???
  • ???subjectarea.asjc.1100.1104???
  • ???subjectarea.asjc.2300.2312???


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