3-D TURBULENT STRUCTURES IN DEPTH-VARYING UNSTEADY COMPOUND OPEN-CHANNEL FLOWS

Integral turbulent scales in unsteady rapidly varied open channel flows

Assessment of Turbulent Models in Computation of Strongly Curved Open Channel Flows

Several rigorous turbulent models have been developed in the past years and it can be seen that more research is needed to reach a better understanding of their generality and precision by verifying their applications for distinct hydraulic phenomena; under certain assumptions. This survey evaluates the performance of Standard k-ε, Realizable k-ε, RNG k-ε, k-ω and RSM models in predicting flow ...

Turbulent flows in straight compound open-channel with a transverse embankment on the floodplain

24 The present study deals with turbulent flows in an asymmetrical compound channel with an 25 embankment set on the floodplain, perpendicularly to the longitudinal direction. The main purpose of 26 this study was to assess how a rapidly varied flow affects interaction between the floodplain flow and 27 the main channel flow. In addition to rapid changes in the water level and velocity across t...

Unsteady air–water flow measurements in sudden open channel flows

Measurements of air–water flow properties are reasonably simple in steady flows, but not so in unsteady flows. Some studies investigated periodic flows in which instantaneous data were averaged over several cycles. During the present work, new unsteady air–water flow measurements were performed in sudden open channel flow surges. Unsteady air–water flow measurements were performed in the wave f...

SPH modelling of depth‐limited turbulent open channel flows over rough boundaries

A numerical model based on the smoothed particle hydrodynamics method is developed to simulate depth-limited turbulent open channel flows over hydraulically rough beds. The 2D Lagrangian form of the Navier-Stokes equations is solved, in which a drag-based formulation is used based on an effective roughness zone near the bed to account for the roughness effect of bed spheres and an improved sub-...