ABSTRACT
ABSTRACT: The influence of denser inflow on the transient mixing process in cylindrical service reservoirs was investigated using computational fluid dynamics (CFD). The inlet pipe was directed upwards along the symmetry line in the centre of the reservoir, which allowed the flow to be simulated using a two-dimensional axisymmetric model. The standard k- model of turbulence was used to calculate turbulent mixing and a deforming mesh technique was used to handle the rising water surface. First, the penetration height of negatively buoyant jets was simulated for different jet densimetric Froude numbers and inlet pipe diameters. The results were found to agree reasonably with experimental data. In the next step, mixing processes were simulated in reservoirs with different height-to-width ratios. From these tests, the critical conditions for mixing were quantified in terms of the inflow conditions, the water depth and the height-to-width ratio of the reservoir.
