Vortex separator: proposal of a dimensioning method

Weiss, Gebhard

doi:10.2166/wst.1997.0666

Cited by 4 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rainfall-runoff models such as the Stormwater Management Model (SWMM) (Huber and Dickinson [4]) allow complex coupling of hydrology, PM and PM-bound transport, but do not yet account for BMPspecific calibration, maintenance, scaling or misbehavior. Among approaches to predict HS performance, Weib [5] applied overflow theory and Paul et al [6] utilized semi-empirical equations of vortex flow behavior. Similarly, for filtration, granular filters and permeable pavement filter performance have been examined (Keblin et al [7]).…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics design and forecasting of urban drainage unit operation behaviour

Sansalone¹

2016

WIT Transactions on the Built Environment

View full text Add to dashboard Cite

A primary and historical consideration of urban drainage unit operation behavior is the transport/fate (control) of particulate matter (PM). This consideration has a strong foundation given that PM is the primary source and sink for chemicals (metal elements, organics, nutrients…) and a primary habitat as well as vehicle for pathogens. However the control of PM is challenging; in part due to the heterodisperse and temporally variable size gradation, complex geometries of many unit operations and highly variable and episodic flow rates. The control of PM has led to a spectrum of unit operations from hydrodynamic separation (HS) for coarse particulate and gross detritus separation that do not provide hydrologic control, to large clarification systems such as wet or dry storage systems that provide a much wider clarification response and potential hydrologic control. This study applies the principles of computational fluid dynamics (CFD) to predict PM clarification behavior of these systems subject to dilute multiphase flows (< 2% PM), typical of urban drainage. A standard turbulence model is used to resolve flow, and a discrete phase model (DPM) is utilized to examine PM clarification response. CFD results closely followed physical model results across the entire range of flow rates. Results demonstrate that for smaller unit operations such as an HS that scour can result in significant degradation of behavior that are not maintained. Comparisons are made between measured and CFD modeled results and mass balances are identified. CFD have become one of the most powerful tool for design and forecasting of urban drainage unit operation behavior since continuous simulation modelling.

show abstract

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics design and forecasting of urban drainage unit operation behaviour

Sansalone¹

2016

WIT Transactions on the Built Environment

View full text Add to dashboard Cite

show abstract

“…Hydrodynamic separation (HS) has been suggested as a viable urban drainage physical unit operation [ Rushton , 2004, 2006; Brombach , 1987; Brombach et al , 1993; Pisano and Brombach , 1994; U.S. Environmental Protection Agency , 1999; Andoh and Saul , 2003]. Previous studies of PM separation mechanisms by HS units have ranged from simplified overflow rate theory [ Weib , 1997] to semiempirical approaches based on assumptions of vortex flow behavior [ Paul et al , 1991]. Fenner and Tyack [1997] and Fenner [1998] report that similitude analysis does not yield a single dimensionless group for HS scale up.…”

Section: Introductionmentioning

confidence: 99%

Particle dynamics in a hydrodynamic separator subject to transient rainfall‐runoff

Sansalone

Pathapati

2009

Water Resources Research

View full text Add to dashboard Cite

[1] Analysis of unit operations to separate particulate matter (PM) transported by urban drainage is challenged by coupled hydrologic and mass transport and is commonly based on statistical flow indices. In this study the response of a hydrodynamic separator (HS) to unsteady runoff is modeled with computational fluid dynamics (CFD). Flow is modeled by a k-e model of turbulence with Lagrangian unsteady tracking for particle size distributions (PSDs). CFD results reproduced HS-captured PM mass within 10%. Validated unsteady CFD results are compared to steady flow and PM event mean concentrations, indicating that event-based flow statistics do not represent unsteady HS behavior. Mean and median flows underestimate effluent PM mass, while peak flow overestimates to a lesser magnitude depending on hydrologic and PM coupling. Unsteady flow and PSD coupling in the CFD model yield accurate predictive capability for PM separation by a physically validated unit operation (HS) compared to common event-based flow statistics. While steady flow indices do not reproduce PM behavior for unit operations loaded by unsteady urban drainage, such indices are pragmatic and heuristic for initial phase pilot-scale testing.

show abstract

Factors influencing the removal of fine non-cohesive sediment by vortex settling basin at small river abstraction works

Kiringu

Basson

2021

International Journal of Sediment Research

View full text Add to dashboard Cite

Vortex separator: proposal of a dimensioning method

Cited by 4 publications

References 0 publications

Computational fluid dynamics design and forecasting of urban drainage unit operation behaviour

Computational fluid dynamics design and forecasting of urban drainage unit operation behaviour

Particle dynamics in a hydrodynamic separator subject to transient rainfall‐runoff

Factors influencing the removal of fine non-cohesive sediment by vortex settling basin at small river abstraction works

Contact Info

Product

Resources

About