Developments in a methodology for the design of engineered invert traps in combined sewer systems

Buxton, A.; Tait, S.; Stovin, Virginia; Saul, Adrian J.

doi:10.2166/wst.2002.0125

Cited by 15 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where, ws is fall velocity (m/s), * d is dimensionless particle diameter, g is gravity acceleration (m/s 2 ), ν is kinematic viscosity of water (m 2 /s) and d is particle diameter (sieve diameter, m). For this purpose, the input data (particle size, specific gravity, kinematic viscosity of water) of Buxton et al (2002) was fitted into these four equations of particle fall velocity and the average percent error between calculated and experimentally measured value was estimated for each equation. It was observed that all four empirical equations underpredicting the fall velocity values as compared with the experimentally measured values of Buxton et al (2002).…”

Section: Specific Gravity (G) and Density Of Sewer Solid (ρSs)mentioning

confidence: 99%

“…The deposition of particles reduces the depth of flow, which will reduce the design discharge capacity of sewers and open drains. Due to this, the water spills out of the open drains and sewers and creates flooding and waterlogging problems, resulting in environmental nuisance and an impediment to the traffic movement (Buxton et al, 2002;Kaushal, 2016a, 2016b;Kaushal, 2008a, 2008b). The deposited sediment particles will experience no force of orientation during sedimentation in viscous flow regime, but at high Reynold numbers particle orientation will occur chaotically (Corn, 1963;Gans, 1928).…”

Section: Introductionmentioning

confidence: 99%

“…Faram and Harwood (2000) suggested that the CFD is a powerful, reliable and cost-effective means or tool which can be used to allow alternative designs of a system or an alternative system. Buxton et al (2002) experimentally obtained sediment retention efficiencies of rectangular invert traps with three configurations i.e. trap with slots of 90, 45 and 22.5 mm.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance analysis of rectangular SIT (sediment invert trap) for stormwater drainage system

Beg

Kaushal

2022

Journal of Hydrology and Hydromechanics

View full text Add to dashboard Cite

Deposition of solid particles in the stormwater sewers reduces the discharging capacity, causing inundation. A sediment invert trap (SIT) is an option that can be installed at the bottom of the stormwater sewer drain to intercept the flowing solid particles. In the present study performance of rectangular SIT were analyzed experimentally and computationally. Variation of particle trapping efficiency of rectangular SIT fitted at the bottom of the open channel flume has been studied under the interpretation of invert trap depth, flow depth, particle size, particle shape, and slot width. To predict the flow field and trap efficiency of a rectangular invert trap, 2D-VOF-DPM-CFD modelling has been carried out using ANSYS Fluent 2020 R1 software. For velocity field determination, the volume of fluid (VOF) model was used along with realizable k-є turbulence model. To predict particle trap efficiency, stochastic discrete phase model (DPM) was utilized. From experimental study and CFD modeling, it has been found that the particle trap efficiency of rectangular invert trap varied with change in the depth of invert trap, sediment size, shape factor, depth of flow and slot width. Consideration of particle shape in terms of shape factor in the modeling of solid-phase through DPM validated the CFD predicted results with those obtained experimentally with mean absolute percent error (MAPE) of 2.68%, 3.99% and 6.6% for sewer solid size ranges SS1, SS2, and SS3 respectively at all flow depths for both slot widths considered in this study.

show abstract

Section: Specific Gravity (G) and Density Of Sewer Solid (ρSs)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance analysis of rectangular SIT (sediment invert trap) for stormwater drainage system

Beg

Kaushal

2022

Journal of Hydrology and Hydromechanics

View full text Add to dashboard Cite

show abstract

“…Also, CFD studies with GPT related devices, such as sewage structures, storage/ retention tanks and hydrodynamic separators have provided valuable insights into flow patterns, pollutant mixing and sediment transport behaviour (Stovin et al 1999(Stovin et al , 2000(Stovin et al , 2002Harwood 2002;Faram and Harwood 2003). Two-dimensional CFD models have been used to study global flow structures and sediment retention in invert traps (Buxton et al 2002;Gupta et al 2005). were allowed to operate for a minimum of one hour prior to taking measurements, after which the water free surface in the GPT and also downstream was observed to be smooth and free of any obvious wave-like disturbances.…”

Section: Introductionmentioning

confidence: 99%

An experimental and theoretical investigation of flow in a gross pollutant trap

Madhani

Kelson

Brown

2009

Water Science and Technology

View full text Add to dashboard Cite

Flow through a gross pollutant trap (GPT) with fully blocked screens is investigated experimentally and theoretically using computational fluid dynamics (CFD). Due to the wide range of possible flow regimes, an experimental approach is developed which uses a downstream weir arrangement to control the nature of the flow and the variation in free surface height. To determine the overall flow structure, measurements are taken at a fixed depth throughout the trap with an Acoustic Doppler Velocimeter (ADV), including velocity profile data across three cross sections of the GPT suitable for more detailed comparison with simulations. Observations of the near-wall flow features at the free surface are also taken, due to their likely importance for understanding litter capture and retention in the GPT. Complementary CFD modelling (using Fluent 6.3) is performed using a two-dimensional k-epsilon turbulence model along with either standard wall law boundary conditions or enhanced near-wall modelling approaches. Comparison with experiments suggest that neither CFD modelling approach could be considered as clearly superior to the other, despite the significant difference in near-wall mesh refinement and modelling that is involved. The experimental approach taken here is found useful to control the flow regime in the GPT and further experiments are recommended to study a greater range of flow conditions.

show abstract

“…This is confirmed by carrying out the simulation for various cases involving simulation of the centrally placed slot with both covers at the same height, a simulation using a raised downstream cover, a simulation with a slot situated at the downstream edge of the trap, and a simulation with the slot situated at the upstream edge of the trap. Buxton et al (2002) proposed a 2-D computational model to compare the results of sediment retention efficiency of the channel with an invert trap with that of laboratory results. A renormalization group (RNG) j-e model was used in the model, and the performance of three slotted rectangular configurations with slots of 90 mm, 45 mm, and 22.5 mm was predicted.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional CFD Modeling for Optimization of Invert Trap Configuration to Be Used in Sewer Solids Management

Thinglas

Kaushal

2008

Particulate Science and Technology

View full text Add to dashboard Cite

Flow field prediction and optimization of invert trap configuration have been carried out by using three-dimensional computational fluid dynamics (CFD) modeling with the help of FLUENT software using renormalization group (RNG) k-e along with the discrete phase model (DPM). A hexagonal=tetrahedral shape and map-type nonuniform grid were chosen to discretize the entire computational domain, and a control volume finite difference method was used to solve the governing equations. In the present study, five different invert trap configurations (rectangular with and without lid on both sides, trapezoidal, trapezoidal with rectangular base, and rectangular with trapezoidal base with lid on both sides) have been simulated for the flow of three different inert sediment types (sand, styrocell, and plastic beads) at six flow rates (0.35, 0.70, 1.05, 1.35, 4.55, and 9.95 Lps) for each trap. The discharges selected in the present study cover the entire range of discharge expected in channels during dry weather flow and monsoon. The simulation results are capable of showing particle trajectories and the effect of flow rate and trap geometry on the flow patterns developed within the trap. Based on 3-D CFD modeling and experimental measurements, it has been concluded that the invert trap having a rectangular shape with trapezoidal base with lids on both sides is the most efficient trap configuration with highest sediment retention ratio.

show abstract

Developments in a methodology for the design of engineered invert traps in combined sewer systems

Cited by 15 publications

References 6 publications

Performance analysis of rectangular SIT (sediment invert trap) for stormwater drainage system

Performance analysis of rectangular SIT (sediment invert trap) for stormwater drainage system

An experimental and theoretical investigation of flow in a gross pollutant trap

Three-Dimensional CFD Modeling for Optimization of Invert Trap Configuration to Be Used in Sewer Solids Management

Contact Info

Product

Resources

About