CFD techniques for mixing and dispersion of desalination and other marine discharges

Robinson, D. and Wood, M. and Piggott, M. and Gorman, G. (2014) CFD techniques for mixing and dispersion of desalination and other marine discharges. In: International Conference on Desalination, Environment and Marine Outfall Systems, 13-16 April 2014, Muscat, Oman.

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Abstract

Accurate and appropriate assessment of the dispersion and dilution of effluent is important when planning desalination and other marine discharges. Environmental impact and engineering constraints must be considered in the design and planning processes and this usually involves computational models. Two-stage approaches are often used: 1) a near-field dilution assessment, based on mixing zone software or empirical formulae; and 2) a mid- to far-field dilution/dispersion assessment to predict wider dispersion, using hydrodynamic models. As numerical methods and computational power improve, computational fluid dynamics (CFD) techniques are likely to be increasingly used to model dispersion in both the near- and far-field regions. However, in order to apply such models with confidence, validation of the underlying discretisation schemes and turbulence closures must be carried out. This paper presents preliminary results of a joint study carried out between Imperial College London and HR Wallingford to assess the most appropriate methods for modelling the near-field effects of turbulence and buoyancy on mixing within the Fluidity software. Two standard test cases for modelling turbulence in typical environmental jet discharge flow regimes are simulated: the buoyant jet, and the dense jet.

Item Type: Conference or Workshop Item (Paper)
Subjects: Maritime > Environmental impact assessment
Coasts > General
Divisions: Coastal
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:50
Last Modified: 02 Apr 2020 09:50
URI: http://eprints.hrwallingford.com/id/eprint/954

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