In: Journal of Hydrology and Hydromechanics, vol. 64, no. 1
Akbar Safarzadeh - Wernher Brevis
Rok, strany: 2016, 83 - 90
Shallow flow; RANS; SPIV; Side obstacle; Shear layer; Turbulence.
URL originálneho zdroja: http://www.ih.savba.sk/jhh
In this work the performance of Reynolds Averaged Navier-Stokes (RANS) simulations to predict the flow structure developed by the presence of a sidewall obstacle in a uniform open-channel shallow flow is discussed. The tested geometry was selected due to its important role in several fluvial applications, such as the control of riverbank erosion and the creation of improved ecological conditions in river restoration applications. The results are compared against experimental laboratory velocity fields obtained after Large Scale Particle Image Velocimetry (LSPIV) measurements. It is shown that the length of reattachment of the separated shear layer generated by the obstacle is well predicted by a Reynolds Stress Model, while classical two-equation models show important limitations. All the performed RANS simulations are unable to properly predict the formation of a secondary gyre region, which develops immediately downstream the obstacle.
Safarzadeh, A., Brevis, W. 2016. Assessment of 3D-RANS models for the simulation of topographically forced shallow flows. In Journal of Hydrology and Hydromechanics, vol. 64, no.1, pp. 83-90. 0042-790X (until 2019) .
Safarzadeh, A., Brevis, W. (2016). Assessment of 3D-RANS models for the simulation of topographically forced shallow flows. Journal of Hydrology and Hydromechanics, 64(1), 83-90. 0042-790X (until 2019) .