Journal article
Significance of buoyancy in turbulence closure for computational fluid dynamics modelling of ultraviolet disinfection in maturation ponds
Water science and technology, Vol.77(5), pp.1372-1385
12/03/2018
PMID: 29528325
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Source: InCites
Abstract
Buoyancy-driven turbulent dispersion in a maturation pond is studied by a combination of field measurements and computational fluid dynamics. Modelling flow in maturation ponds requires turbulent closure models because of the large physical size and the need to model on diurnal time scales. Simulation results are shown to be more sensitive to the inclusion of a buoyancy production term appearing in the turbulent transport equations than to the model choice. Comparisons with experimental thermal profiles show that without this term, thermal mixing is over predicted. When including the term, stratification occurs but thermal mixing is under-predicted in the lower water column. In terms of pond performance, the effect of this term is to cause increased surface die-off of Escherichia coli during sunlight hours due to the generation of stratification. It is recommended that future modelling consider and implement this term.
Details
- Title
- Significance of buoyancy in turbulence closure for computational fluid dynamics modelling of ultraviolet disinfection in maturation ponds
- Creators
- Nw Dahl - Griffith UniversityPl WoodfieldBaf SimpsonHm StrattonCharles Lemckert - Faculty of Science and Engineering
- Publication Details
- Water science and technology, Vol.77(5), pp.1372-1385
- Publisher
- IWA Publishing
- Identifiers
- 991013056610702368
- Copyright
- © IWA Publishing 2018
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article