Experimental drop test investigation into wetdeck slamming loads on a generic catamaran hullform

A series of drop-test experiments was performed to investigate the hydrodynamic loads experienced by a generic wave-piercer catamaran hullform during water impacts. The experiments, which focus on the characterisation of the unsteady slam loads on an arched wetdeck, were conducted using a Servo-hydr...

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Bibliographic Details
Published in:Ocean engineering 2016-05, Vol.117, p.143-153
Main Authors: Swidan, Ahmed, Thomas, Giles, Ranmuthugala, Dev, Amin, Walid, Penesis, Irene, Allen, Tom, Battley, Mark
Format: Article
Language:English
Subjects:
Catamaran
Catamarans
Computational fluid dynamics
Constants
Drop tests
Impact tests
Impact velocity
Marine
Ocean engineering
Pressure distribution
Slamming forces
Unsteady
Water impact
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Summary:A series of drop-test experiments was performed to investigate the hydrodynamic loads experienced by a generic wave-piercer catamaran hullform during water impacts. The experiments, which focus on the characterisation of the unsteady slam loads on an arched wetdeck, were conducted using a Servo-hydraulic Slam Testing System (SSTS) that allows the model to enter the water at a range of constant speeds up to 10m/s. The systematic and random uncertainties associated with the drop test results are quantified in detail. The relationships between water-entry velocity and both slam force and pressure distributions are presented and discussed with a strong relationship between the slam force peak magnitudes and impact velocity being observed. In addition the three dimensionality of the water flow in these slam impact events is characterised. •Comprehensive set of benchmarking data is provided for use in the validation of numerical techniques to predict slam impact loads of catamarans.•New definition for the air gap elevation of catamarans is proposed.•Strong relationship between the relative impact velocity and wetdeck slam force magnitude is concluded.•Slamming pressure data along the highest points on the wetdeck arch is presented.•Wetdeck slam is proven to be a three-dimensional phenomenon.
ISSN:0029-8018
1873-5258
DOI:10.1016/j.oceaneng.2016.03.059