Experimental Comparison of Different Characteristic Variables in Three-Dimensional Turbidity Currents

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Experimental Study on the deposition behavior of turbidity currents

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Experimental Study of Turbulence Characteristics of Three-Dimensional Turbidity Currents

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Effect of Entrance Froude Number on Vertical Distribution Velocity and Concentration in Turbidity Current Using Experimental Study

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Experiments and numerical modeling of baffle configuration effects on the performance of sedimentation tanks

The hydraulic efficiency of sedimentation basins is reduced by short-circuiting, circulation zones and bottom particle-laden jets. Baffles are used to improve sediment tank performance. In this study, laboratory experiments were used to examine the hydrodynamics of several baffle configurations. An accompanying numerical analysis was performed based on the 2D Reynolds-Averaged Navier-Stokes equations along with the k-ε turbulence closure model. The numerical model was supplemented with the Volume-Of-Fluid technique (VOF), and the advection-diffusion equation to simulate the dynamics of particle-laden flow. Model predictions compared well with the experimental data. An empirical function was constructed to indicate the location and amount of sediment collected in the tank. Hydraulic performance was determined for given baffle locations and heights. The results revealed that, for the laboratory setup, a baffle half way along its length decreases its performance, while a baffle much closer to its inlet and with height 25 - 30% of water depth improves efficiency

Hydrodynamics analysis of density current using two-equation turbulence k − w model

Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732Density current is formed when fluid heavier than ambient fluid flows down an inclined bed. These flows, which are common phenomena in nature, can be produced by salinity and temperature inhomogeneities, or suspended particles of silt and clay. Driven by density differences between the inflow and clear water in the reservoirs, the density current plunges the clear water and moves toward the dam. Density currents flowing on a sloping bed, the vertical spreading due to water entrainment plays an important role in determining the propagation rate in longitudinal direction. In this work, two-dimensional density currents were simulated by turbulent model. A collocated finite volume scheme has been used to simulate the motion of this current which propagates under deep ambient water. The governing equations form an elliptic system of partial differential equations, namely continuity, x- momentum, and y- momentum equations for flow and mass conservation equation for particles and the model equations for turbulent flow. In this study, density current with uniform velocity and uniform concentration enters a channel via a sluice gate into a lighter ambient fluid and moves forward down-slope. The model has been verified with the experimental data sets. Moreover, results have been compared with the standard turbulent model and show that the model has the poor result on this current in comparison with the turbulent model