Open AccessA comparative study of manhole hydraulics using stereoscopic PIV and different RANS models
Author(s) -
Md Nazmul Azim Beg,
Rita F. Carvalho,
Simon Tait,
Wernher Brevis,
Matteo Rubinato,
Alma Schellart,
Jorge Leandro
Publication year - 2018
Publication title -
water science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.406
H-Index - 137
eISSN - 1996-9732
pISSN - 0273-1223
DOI - 10.2166/wst.2018.089
Subject(s) - reynolds averaged navier–stokes equations , turbulence , mechanics , computational fluid dynamics , particle image velocimetry , reynolds stress , vorticity , hydraulics , turbulence kinetic energy , shear stress , geology , geotechnical engineering , vortex , physics , thermodynamics
Flows in manholes are complex and may include swirling and recirculation flow with significant turbulence and vorticity. However, how these complex 3D flow patterns could generate different energy losses and so affect flow quantity in the wider sewer network is unknown. In this work, 2D3C stereo Particle Image Velocimetry measurements are made in a surcharged scaled circular manhole. A computational fluid dynamics (CFD) model in OpenFOAM ® with four different Reynolds Averaged Navier Stokes (RANS) turbulence model is constructed using a volume of fluid model, to represent flows in this manhole. Velocity profiles and pressure distributions from the models are compared with the experimental data in view of finding the best modelling approach. It was found among four different RANS models that the re-normalization group (RNG) k-ɛ and k-ω shear stress transport (SST) gave a better approximation for velocity and pressure.
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