Flow modeling allows you to investigate more design options and "what if" scenarios than ever before. In this configuration, wastewater is fed into a sedimentation tank through a central column and dispersed radially outwards through a stilling well. Sludge accumulates at the bottom and is typically directed towards the center by slowly rotating sweepers where it can be pumped out from the tank. The clarified effluent is collected at the tank perimeter. To set up this problem, Fluent computational fluid dynamics (CFD) software was used to track the free surface and estimate the amount of spillage over the stilling well.

A simple two-phase model was used to estimate the distribution of particulate concentration over time