Settling Tanks

FLOW-3D’s sediment scour and drift flux model are excellent tools to model the settling process of particles as they circulate along settling tanks, secondary clarifiers and other similar structures. These models allow the user to enter multi-species compositions into the model, with each their individual characteristics such as particle diameter, drag coefficients, etc.

Standard outputs include suspended sediment concentration in the fluid, as well as packed sediment accumulation and rate of accumulation on the solid surfaces of the geometry at hand. Additional hydraulic characteristics of the system as a whole (e.g., overall hydraulic efficiency and residence time) are easily obtained through the concurrent use of the scalar tracer model. FLOW-3D’s FAVOR™ method to simply and efficiently represent solid objects, including moving object (such as the action of valves or gates opening) allows for extremely efficient studies of the geometric parameter space with minimal, if any, time spent on re-meshing operations.

Baffle objects, which in FLOW-3D can act either as walls, porous walls, or flux measuring surfaces, add additional flexibility to the modeling approaches available for these types of simulations.

Settling tank simulation showing the ability of the drift flux model to simulate transport, deposition, packing and entrainment of multi-species sediment.