A comparative study of manhole hydraulics using stereoscopic PIV and different RANS models
Authors/Creators
- 1. Department of Civil Engineering, University of Coimbra, Coimbra, Portugal
- 2. Department of Civil Engineering, University of Coimbra, Coimbra, Portugal y of Coimbra
- 3. Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK
- 4. || Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK; Department of Hydraulics and Environmental Engineering, Pontifical Catholic University of Chile, Santiago, Chile
- 5. Hydrology and River Basin Management, Technical University of Munich, Munich, Germany
Description
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 (PIV) measurements are made in a surcharged scaled circular manhole. A CFD model in OpenFOAM® with four different Reynolds Averaged Navier Stokes (RANS) turbulence model is constructed using a VOF 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 RNG k-ε and k-ω SST gave a better approximation for velocity and pressure.