Abstract:
In order to investigate differences of RANS turbulence models on solving flow over bluff bodies, flow past a two-dimensional square cylinder at
Re=22 000 is simulated, and results are obtained respectively by using five two-equation Eddy Viscosity Turbulence Models. By comparing with available data and comparing between each other, the advantages as well as weaknesses of these models are revealed. It is found that the results are significantly affected by the employed meshes. The RNG
k-
ε model is of the highest efficiency while the SST
k-
ω turbulence model is of the worst. The results of Standard
k-
ε turbulence model are generally worse than those of other models. The results from RNG
k-
ε, realizable
k-
ε and standard
k-
ω models are very close to those from the large-eddy-simulation. The SST
k-
ω model yields better numerical results than the other models, and its flow field properties in the wake fit experimental results well. However, compared with results from the experiment and the large-eddy-simulation, un-negligible differences can be found in the results of the five models.