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Physical model “Influence of breaking
logs on flow patterns induced by lock
filling with gate openings”
Verelst, K.(1); Vercruysse, J.(1); Ramos, P.(2)
05/10/2015
Belgian Hydraulics Day - FHR
(1) (2)
Outline
• Aim of the research
• Project description
• Physical model
• Measurements
Aim of the research
• Design of filling/emptying system of lock
Filling
Emptying
Time
Maximum
force on the
ship
Construction
costs
Aim of the research
• Filling emptying systems with gate openings :
• Limiting forces on ship can be achieved by:
(“Design of locks”)
• Spreading the flow along width of lock chamber
• Generating turbulence to break down energy of filling
jets
• Directing the flow along lock axis
• Generating turbulence: dutch literature advises
breaking logs
Evergem (BE)
Oranje lock
Amsterdam (NL)
Aim of the research
• Research questions concerning breaking logs:
• Influence of breaking logs on current pattern,
discharge coefficient, …
• Shape of breaking log
• Design of breaking logs
• Dutch design guidelines:
• Surface breaking logs > 50% of surface gate
opening
• Distance between breaking logs > 0.30 m
! contradictory
• Gain knowledge on flow through gate openings
 design software, e.g. vul_sluis, LOCKFILL
Project description
• Task order 1: Measurements on physical model
(March - Oktober 2015)
• Hydraulics Laboratory Ghent University
• Task order 2: CFD modeling with OpenFOAM
(starting 12/10/2015)
• IMDC nv
Physical model
• General physical model
• Not scaled version of existing lock/existing design
• Design based on dimensionless comparison of F/E
systems of recent studied locks
• One opening in lock gate Ø 200 mm
• Lock gate perpendicular to lock
Upstream
Downstream
Physical model
• Opening in lock gate: “Standard geometry” based on
design of lock of Sint-Baafs-Vijve
• Upstream: circular tube Ø 200 mm
• Downstream: Rectangular section W=278 mm H=242 mm
• 3 breaking logs tubular shape, W = 22 mm
Physical model tests
• Position of breaking logs
• No breaking logs
• Breaking logs inside/outside the lock gate
• Horizontal/vertical position breaking logs
• Shape of breaking log
• Tubular profile
• I-profile (planned)
• Number of breaking logs (2, 3, 4, 5) and distance between
breaking logs (planned)
• (planned) tests with alternative configuration of opening in
lock gate: circular opening, without circular tube, with
guiding vanes
(designed together with department for design of lock
gates)
Measurements
• Discharge through opening
• Water level in upstream and downstream reservoir
• Velocity in lock chamber downstream of opening
• Vectrino profiler
• Semi-automatic measuring robot
• Water level depression above the jet
Measurements
• Visualisation flow pattern in lock chamber:
• 6 video cameras: 3 side and 3 above model
• Backlights, with diffusion foil
• Dye: Potassium Permanganate
• Visualisation flow pattern in lock gate between lifting
gate and breaking logs
Results
No breaking logs
Hdownstr= 1.00 m
Hupstr= 1.30 m
(vertical) Breaking logs
outside lock gate
Hdownstr= 1.00 m
Hupstr= 1.20 m
Results
(vertical) Breaking logs
outside lock gate
Hdownstr= 1.00 m
Hupstr= 1.20 m
Visit physical model

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Kristof verelst belgian hydraulic_day_research_breaking_logs

  • 1. Physical model “Influence of breaking logs on flow patterns induced by lock filling with gate openings” Verelst, K.(1); Vercruysse, J.(1); Ramos, P.(2) 05/10/2015 Belgian Hydraulics Day - FHR (1) (2)
  • 2. Outline • Aim of the research • Project description • Physical model • Measurements
  • 3. Aim of the research • Design of filling/emptying system of lock Filling Emptying Time Maximum force on the ship Construction costs
  • 4. Aim of the research • Filling emptying systems with gate openings : • Limiting forces on ship can be achieved by: (“Design of locks”) • Spreading the flow along width of lock chamber • Generating turbulence to break down energy of filling jets • Directing the flow along lock axis • Generating turbulence: dutch literature advises breaking logs Evergem (BE) Oranje lock Amsterdam (NL)
  • 5. Aim of the research • Research questions concerning breaking logs: • Influence of breaking logs on current pattern, discharge coefficient, … • Shape of breaking log • Design of breaking logs • Dutch design guidelines: • Surface breaking logs > 50% of surface gate opening • Distance between breaking logs > 0.30 m ! contradictory • Gain knowledge on flow through gate openings  design software, e.g. vul_sluis, LOCKFILL
  • 6. Project description • Task order 1: Measurements on physical model (March - Oktober 2015) • Hydraulics Laboratory Ghent University • Task order 2: CFD modeling with OpenFOAM (starting 12/10/2015) • IMDC nv
  • 7. Physical model • General physical model • Not scaled version of existing lock/existing design • Design based on dimensionless comparison of F/E systems of recent studied locks • One opening in lock gate Ø 200 mm • Lock gate perpendicular to lock Upstream Downstream
  • 8. Physical model • Opening in lock gate: “Standard geometry” based on design of lock of Sint-Baafs-Vijve • Upstream: circular tube Ø 200 mm • Downstream: Rectangular section W=278 mm H=242 mm • 3 breaking logs tubular shape, W = 22 mm
  • 9. Physical model tests • Position of breaking logs • No breaking logs • Breaking logs inside/outside the lock gate • Horizontal/vertical position breaking logs • Shape of breaking log • Tubular profile • I-profile (planned) • Number of breaking logs (2, 3, 4, 5) and distance between breaking logs (planned) • (planned) tests with alternative configuration of opening in lock gate: circular opening, without circular tube, with guiding vanes (designed together with department for design of lock gates)
  • 10. Measurements • Discharge through opening • Water level in upstream and downstream reservoir • Velocity in lock chamber downstream of opening • Vectrino profiler • Semi-automatic measuring robot • Water level depression above the jet
  • 11. Measurements • Visualisation flow pattern in lock chamber: • 6 video cameras: 3 side and 3 above model • Backlights, with diffusion foil • Dye: Potassium Permanganate • Visualisation flow pattern in lock gate between lifting gate and breaking logs
  • 12. Results No breaking logs Hdownstr= 1.00 m Hupstr= 1.30 m (vertical) Breaking logs outside lock gate Hdownstr= 1.00 m Hupstr= 1.20 m
  • 13. Results (vertical) Breaking logs outside lock gate Hdownstr= 1.00 m Hupstr= 1.20 m