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Abstract

A ship in waves may experience a water impact event known as a slam. In this paper, slam-induced bending of wave-piercing catamarans in head seas is predicted by way of fluid–structure interaction simulations. The flow field during slamming of a wave-piercing catamaran is highly non-linear and cannot be accurately captured using potential flow methods as a result of the interactions between the flow fields produced by water entry of the separate demihulls and centre bow. Thus, the Reynolds-Averaged Navier–Stokes (RANS) equations are solved for rigid body motion of a vessel at model-scale. Verification and validation is conducted using model-scale data from a Hydroelastic Segmented Model (HSM). One-way and two-way interactions are computed considering vibration of the hull girder. In the case of one-way interactions, the computed fluid loads affect the structure, but the structural response does not affect the fluid domain solution whereas for the two-way interactions the structural response affects the fluid solution. A new method for capturing the non-linear time variation in added mass is developed and deemed necessary when computing one-way interactions, primarily as a result of the large changes in forward wetted area present for a wave-piercing catamaran. It is shown that two-way interaction simulation is not needed for predicting the slam induced hull girder loads. One-way interaction simulation can therefore be used allowing reduced computational effort.

Item Type:	Article
Authors/Creators:	McVicar, J and Lavroff, J and Davis, MR and Thomas, G
Keywords:	Slamming, bending, CFD, fluid structure interaction, model tests, computer simulation
Journal or Publication Title:	Journal of Fluids and Structures
Publisher:	Elsevier Science Ltd
ISSN:	0889-9746
DOI / ID Number:	https://doi.org/10.1016/j.jfluidstructs.2018.06.009
Copyright Information:	Copyright 2018 Elsevier Ltd.
Related URLs:	Google Scholar: Lavroff, J UTAS Profile: Lavroff, J UTAS Profile: Davis, MR
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