CFD of Aeration Plumes

Where geometry, inflows or diffuser layout are complex, CFD resolves what integral plume models cannot: the full three-dimensional velocity field, oxygen distribution, mixing time and any dead zones. We use it to optimise diffuser placement and confirm a design delivers oxygen where it is needed.

CFD modelling of aeration plumes — resolving the three-dimensional circulation, oxygen distribution and dead zones a simple model cannot show.

Reynolds & Bauhm sizes reservoir aeration from measured oxygen demand and transfer fundamentals — selecting destratification or hypolimnetic oxygenation and the right device, with plume and diffuser design proven against the reservoir's depth and stratification.

Reservoir aeration and oxygenation manage the consequences of thermal stratification, where a warm surface layer seals a cold, oxygen-starved hypolimnion beneath a thermocline. Once isolated, the hypolimnion's oxygen is consumed by sediment demand and cannot be replaced from the atmosphere, triggering the release of iron, manganese, ammonia and phosphorus from the bed that degrade raw-water quality — the problem aeration exists to solve.

Two strategies address it. Destratification mixes the whole water column to prevent or break stratification, re-oxygenating the bottom by circulation; hypolimnetic aeration or oxygenation instead adds oxygen to the deep layer while deliberately preserving the cold, stratified structure that downstream abstraction may rely on. The choice depends on objectives, depth and the abstraction regime.