Experimental and numerical investigation of deposition in ......Experimental and numerical...
Transcript of Experimental and numerical investigation of deposition in ......Experimental and numerical...
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Experimental and numerical investigation of deposition in sewer detention tanks
Matthieu [email protected]
Urban hydraulics,Fluid and solid mechanics institute of Strasbourg (IMFS),
National school for water and environmental engineering of Strasbourg (ENGEES), France
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Summary
1. Presentation of ‘Urban hydraulics’2. Introduction of this study3. Experimentation4. Numerical modelling5. Conclusion and outlook
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Pluviometry
Receiving watercourse
Sewer system
Wastewater treatment plant
Grates
Venturi flume
Catchment area
Urban hydraulics
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Urban hydraulics
Numerical modelling Experimentation
Hydraulics
Sediment transport
Hydraulic works:Grates, pipes, CSO chambers, detention tanks, Venturi flumes…
InstrumentationDiagnosisDesign
RESE
ARC
HEN
GIN
EERI
NG
(…)
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Summary
1. Presentation of ‘Urban hydraulics’2. Introduction of this study3. Physical modelling4. Numerical modelling5. Conclusion and outlook
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Introduction
• Objective of the whole study: operational tool for the design and the rehabilitation of sewer detention tanks
– numerical model– technical guidelines
• Need for experimental data about trap efficiency and spatial distribution of deposits
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Introduction
Complex geometriesCircular tanksRectangular tanks
Physical models:Stovin (1997) - Univ. Sheffield
Dufresne (2008) - INSA StrasbourgKantoush (2008) - EPFL
Dufresne, Dewals et al. (2009) - ULgCamnasio (2010) - Milano, EPFL
Physical model:In project (2011)
Real-life applications
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Introduction
Complex geometriesCircular tanksRectangular tanks
Physical models:Stovin (1997) - Univ. Sheffield
Dufresne (2008) - INSA StrasbourgKantoush (2008) - EPFLDufresne (2009) - ULg
Camnasio (2010) - Milano, EPFL
Physical model:In project (2011)
Real-life applications
Data for developing and/or optimizing numerical models
Data for testing numerical models
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Summary
1. Presentation of ‘Urban hydraulics’2. Introduction of this study3. Experimentation4. Numerical modelling5. Conclusion and outlook
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2.4 mm
1,020 kg/m3
25 mm/sFr = 0.2
h/ΔB = 0.6
Spatial distribution of deposits
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Trap efficiency
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Summary
1. Presentation of ‘Urban hydraulics’2. Introduction of this study3. Experimentation4. Numerical modelling5. Conclusion and outlook
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• Software: Ansys Fluent (3D)
• Flow models:– Isotropic turbulence model: k-ε
– Wall treatment: standard wall functions
– Free surface: symmetry plane
• Particle transport:– Lagrangian particle tracking
– Specific treatment for deposition on the bed: bed shear stress, bed turbulent kinetic energy
Numerical modelling
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If value < thresholdThen deposition
Bed of the tank
Trajectory of the particle
If value > thresholdThen resuspension
Lagrangian particle tracking
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2 L/s
Numerical modelling
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1 L/s
Numerical modelling
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ColumnsObstacle
Asym. flow Sym. flow
Numerical modelling
Trap
eff
icie
ncy
Inflow velocity (m/s)
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Summary
1. Presentation of ‘Urban hydraulics’2. Introduction of this study3. Experimentation4. Numerical modelling5. Conclusion and outlook
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Conclusion and outlook
• Conclusion:– Experimentation => Large dataset of experimental results
– Numerical modelling => New bed boundary condition
– Good reproduction of the spatial distribution of deposits
– Overestimation of the trap efficiency in most cases
• Outlook:– Taking into account the anisotropy of turbulence near the bed
– Threshold values
– Circular tanks
– Real-life applications
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Experimental and numerical investigation of deposition in sewer detention tanks
Matthieu [email protected]
Urban hydraulics,Fluid and solid mechanics institute of Strasbourg (IMFS),
National school for water and environmental engineering of Strasbourg (ENGEES), France