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Particle Image Velocimetry (PIV) is used to visualize and characterize the turbulent jet created by a bow thruster. In the scale model research, the following parameters were varied between tests:
- underUnder-keel clearance
- quayQuay-wall clearance
- rotational Rotational speed of the propeller (jet flow velocity)
- Vessel position/PIV measurement plane
- Use of multiple propellers
- Bed roughness
Results
The different project deliverables of the project can be accessed here:
- Field test report Ghent (MSc. report Jim Tukker): http://resolver.tudelft.nl/uuid:87f3217d-b088-4031-aad3-7e5e3a3029e0
- Physical scale model test report Deltares:
- Physical scale model test report Deltares (no Appendices) :
- CFD report MARIN:
The (raw) measurement data of the physical scale model tests can be made available upon request. Some examples of the type of measurement data that is avaible is shown below. More detailed information is provided in the meausurement report.
Time-averaged velocity maps (ux component) for a free-jet (left), confined jet at high UKC (center) and confined jet at low UKC (right)
The physical scale model dataset that has been obtained within this research project is extensive and characterizes flow induced by a transverse bow thruster in very high detail. The data can therefore be used as a benchmark for numerical model validation and further optimization of design guidelines for bed protections. The research shows that highest flow velocities occur for smallest wall and underkeel-clearances. Present design guidelines predict the magnitude of max. horizontal velocity near the bed well for most tested situations, however farther away from the quay wall guidelines seem to be overly conservative, providing room for optimization of bed protections.
Partners
The following partners are part of this project:
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