TY - GEN
T1 - Evaluation of turbulence closure models for the simulation of circular impinging jets
AU - Ghaneeizad, S. M.
AU - Karamigolbaghi, M.
AU - Atkinson, J. F.
AU - Bennett, S. J.
N1 - Publisher Copyright:
© 2016 Taylor & Francis Group, London.
PY - 2016
Y1 - 2016
N2 - This study examines application of two-equation turbulence closure models for simulation of the Jet Erosion Test (JET) used to evaluate soil erodibility. Four turbulence models were examined: standard, Re-Normalization Group (RNG), and Realizable k-ε, and Shear Stress Transport (SST) k-ε. It was found that all models except the standard k-e over-predict the potential core length due to under-prediction of mixing in this region. This prediction was improved by specifying a higher turbulence kinetic energy for the nozzle boundary condition. The models also were unable to correctly simulate the developed free jet region. A turbulence damping procedure was employed for the SST model that helped improve the velocity prediction in the near-field. However, the velocities in the far-field and impingement regions were still over-estimated, and an excessive turbulence buildup was observed in the impingement region. This study shows that two-equation models are not reliable for predicting the impingement region of a circular jet.
AB - This study examines application of two-equation turbulence closure models for simulation of the Jet Erosion Test (JET) used to evaluate soil erodibility. Four turbulence models were examined: standard, Re-Normalization Group (RNG), and Realizable k-ε, and Shear Stress Transport (SST) k-ε. It was found that all models except the standard k-e over-predict the potential core length due to under-prediction of mixing in this region. This prediction was improved by specifying a higher turbulence kinetic energy for the nozzle boundary condition. The models also were unable to correctly simulate the developed free jet region. A turbulence damping procedure was employed for the SST model that helped improve the velocity prediction in the near-field. However, the velocities in the far-field and impingement regions were still over-estimated, and an excessive turbulence buildup was observed in the impingement region. This study shows that two-equation models are not reliable for predicting the impingement region of a circular jet.
UR - https://www.scopus.com/pages/publications/85015272656
U2 - 10.1201/9781315644479-23
DO - 10.1201/9781315644479-23
M3 - Conference contribution
AN - SCOPUS:85015272656
SN - 9781138029132
T3 - River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
SP - 122
EP - 130
BT - River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
A2 - Constantinescu, George
A2 - Garcia, Marcelo
A2 - Hanes, Dan
PB - CRC Press/Balkema
T2 - International Conference on Fluvial Hydraulics, RIVER FLOW 2016
Y2 - 11 July 2016 through 14 July 2016
ER -