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Propellers of ships generate high velocities in waterways near quay walls, jetties and locks. Often, bed protection is installed in order to prevent instability of hydraulic structures due to propeller scour. Large costs can be associated with its construction. Guidelines for the design of bed protection exists, but propeller-induced loads are far from fully understood and current design guidelines may not always result in optimal bed protection designs. Therefore, a working group on propeller jet research was established, headed by the CROW and Rijkswaterstaat, with the long-term aim to improve design guidelines in order . The research carried out within this working group aims to reduce design-related uncertainty, potentially save construction materials and reduce costs. The TKI research program “SOP Schroefstraalbelasting onderzoeksprogramma - DEL 130” was carried out in the context of this propeller jet working group, aiming to increase the understanding of transversal bow thruster loads reflected off a vertical quay wall and providing validation data for numerical models.
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In 2020 field measurements were have been performed in the Port of Ghent on jets flow velocities induced by a bow thrusters thruster reflected on a vertical quay-wall, where flow . Flow velocities and pressures were measured along the quay-wall and near the bottom. Field measurements provide valuable insight into the flow phenomena in prototype scale. However, due to to practical limitations in the field, assessing the influence of all relevant parameters is practically not feasible. Therefore, using the field measurements as basis, scale model tests and numerical simulations are being have been performed to extend the existing database by a systematic variation of parameters. The numerical simulations have been performed developed by MARIN and the scale model tests have been performed by Deltares.
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- Field test report Ghent (MSc. thesis Jim Tukker, 2021): Report- TUDelft repository
- Physical scale model test report Deltares:
- Physical scale model test report Deltares (no without Appendices) : Characterization of flows induced by propeller jets_no appendices
- CFD report MARIN:
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