Investigation of Flow Patterns in Storm Water Retention Ponds using CFD

Khan, Shuhab D.; Melville, Bruce W.; Shamseldin, Asaad Y.; Fischer, Christoph

doi:10.1061/(asce)ee.1943-7870.0000540

Cited by 18 publications

(17 citation statements)

References 38 publications

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“…; Saggiori ) and the walls were modelled as adiabatic walls (Khan et al . , ) with a roughness height of zero, because for a large body of slow‐moving water the wall roughness value has a minimal effect on the bulk water flow (Tu et al . ; Khan et al .…”

Section: Methodsmentioning

confidence: 99%

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Computational fluid dynamics modelling of different detention pond configurations in the interest of sustainable flow regimes and gravity sedimentation potential

Tsavdaris

Mitchell

Williams

2014

Water & Environment J

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This study presents the results of the flow regime evaluation, by means of computational fluid dynamics (CFD), of a vegetated detention pond located at Waterlooville, Hampshire, UK. Alternative pond layouts were assessed for the same flow conditions on the basis of recommendations made in the literature. The results were validated by comparing the maximum computational velocities for the same case using different numbers of mesh elements. It was found that the development of a CFD model of detention ponds is intricate but feasible. The main findings were: (i) The present design performed well in terms of flood risk management, but the flow patterns could result in questionable treatment efficiency; (ii) vegetation seems to promote horizontal recirculation and turbulence; (iii) triangular and elliptical pond designs showed very poor performance; (iv) the most appropriate design for the given location and hydrological regime is an elliptical pond with a central emergent/submerged island.

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Section: Methodsmentioning

confidence: 99%

“…; Khan et al . ). Therefore, the use of numerical models as design tools can lead to a much better understanding of the flow patterns in ponds.…”

Section: Introductionmentioning

confidence: 97%

Computational fluid dynamics modelling of different detention pond configurations in the interest of sustainable flow regimes and gravity sedimentation potential

Tsavdaris

Mitchell

Williams

2014

Water & Environment J

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“…Shilton (2000); Peterson et al (2000); Persson (2005); Shilton et al (2008); Khan et al (2012); Alvarado et al (2013). These studies have typically focused on pond shape or configuration, but have not taken into account the presence of vegetation.…”

Section: Cfd Modelling Of Pondsmentioning

confidence: 99%

Feasibility of the Porous Zone Approach to Modelling Vegetation in CFD

Sonnenwald

Stovin

Guymer

2016

Hydrodynamic and Mass Transport at Freshwater Aquatic Interfaces

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Vegetation within stormwater ponds varies seasonly and its presence affects the flow field, which in turn affects the pond's Residence Time Distribution and its effectiveness at pollutant removal. Vegetated flows are complex and, as a result, no suitable tools exist for evaluating realistic stormwater pond designs. Recent research has suggested using a porous zone to represent vegetation within a CFD model, and this paper investigates the feasibility of this approach using ANSYS Fluent. One of the main benefits of using a porous zone is the ability to derive the relevant parameters from the known physical characteristics of stem diameter and porosity using the Ergun equation. A sensitivity analysis on the viscous resistance factor 1/α and the inertial resistance factor C 2 has been undertaken by comparing model results to data collected from an experimental vegetated channel. Best fit values of C 2 were obtained for a range of flow conditions including emergent and submerged vegetation. Results show the CFD model to be insensitive to 1/α but very sensitive to values of C 2 . For submerged vegetation, values of C 2 derived from the Ergun equation are under-predictions of best-fit C 2 values as only the turbulence due to the shear layer is represented. The porous zone approach does not take into account turbulence generated from stem wakes such that no meaningful predictions for emergent vegetation were obtained. C 2 values calculated using a force balance show better agreement with bestfit C 2 values than those derived from the Ergun equation. Manually fixing values of k and ε within the porous zone of the model shows initial promise as a means of taking stem wakes into account.

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“…Important CFD studies have also been done in other types of waste stabilisation ponds (Salter et al, 2000;Baléo et al, 2001;Vega et al, 2003;Sah et al, 2011;Passos et al, 2014), aquatic ponds (Peterson et al, 2000), UV chemical reactors (Wols et al, 2015;Xu et al, 2015), and storm water detention ponds (Khan et al, 2013). With the improvement in CFD and computing resources, increasingly complex models are becoming prevalent.…”

Section: Introductionmentioning

confidence: 99%

Significance of buoyancy in turbulence closure for computational fluid dynamics modelling of ultraviolet disinfection in maturation ponds

et al. 2018

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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 2 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.

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Investigation of Flow Patterns in Storm Water Retention Ponds using CFD

Cited by 18 publications

References 38 publications

Computational fluid dynamics modelling of different detention pond configurations in the interest of sustainable flow regimes and gravity sedimentation potential

Computational fluid dynamics modelling of different detention pond configurations in the interest of sustainable flow regimes and gravity sedimentation potential

Feasibility of the Porous Zone Approach to Modelling Vegetation in CFD

Significance of buoyancy in turbulence closure for computational fluid dynamics modelling of ultraviolet disinfection in maturation ponds

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