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Use of CFD to model emergent vegetation in detention ponds

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This paper investigates the accuracy, applicability, and suitability of two different numerical modelling approaches available in Ansys Fluent 12.1 for the study of flow in detention ponds with emergent vegetation by making use of experimental results obtained in a laboratory flume. The aim of this investigation is to formulate an automated firstorder approximation technique that could be used as part of an urban drainage model; such an approach could be an accurate yet practical technique for modelling the effects of vegetation in ponds at pre-construction stage in the interests of predicting general flow patterns. Using the actual vegetation density of a surface water detention pond located at Waterlooville, Hampshire, UK, replicated in a laboratory flume, two different Computational Fluid Dynamics modelling strategies were tested. The first involved the specification of the individual stems within the computational domain, and these results showed very good agreement with experimental data. In the second approach, a porous zone condition was applied in the vegetated region, and here the results seem to be appropriate for predicting general flow arrangements, though without being hydro-dynamically as accurate as the first approach.
Original languageEnglish
Pages (from-to)495-503
JournalJournal of Engineering and Applied Sciences
Volume8
Issue number7
Publication statusPublished - Jul 2013

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