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CFD simulation of motion responses of a trimaran in regular head waves

Nowruzi, L, Enshaei, H ORCID: 0000-0002-5649-7015, Lavroff, J ORCID: 0000-0001-5262-8666, Kianejad, SS and Davis, MR 2019 , 'CFD simulation of motion responses of a trimaran in regular head waves' , Royal Institution of Naval Architects. Transactions. Part A. International Journal of Maritime Engineering, vol. 162, no. Part A , pp. 91-106 .

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Abstract

CFD has proved to be an effective method in solving unsteady Reynolds–Averaged Navier-Stokes (RANS)equations for analysing ships in free surface viscous flow. The research reported in this paper is intended todevelop a better understanding of the parameters influencing high-speed trimaran motions responses. Griddingsystem, time step and reliability analysis were performed in solving RANS equations. Different turbulencemodels were investigated, and the SST Menter K Omega turbulence model proved a more accurate model thanRealizable K-epsilon model. In order to validate the CFD method, the results of the motions response of a highspeedtrimaran are compared against a set of experimental and numerical results from a 1.6 m trimaran modeltested in various head seas conditions. The results suggest that CFD offers a reliable method for predicting pitchand heave motions of trimarans in regular head waves when compared to traditional Strip Theory methods.Unlike strip theory, the effect of breaking waves, hull shape above waterline and green seas are considered inCFD application. A wave resonance phenomenon was observed and Wave deformation as a result of wave-current-wind interaction in CFD was identified as the main source of discrepancy. The results from this workform the basis for future analysis of trimaran motions in oblique seas for developing a better understanding ofthe parameters influencing the seakeeping response, as well as passenger comfort.

Item Type: Article
Authors/Creators:Nowruzi, L and Enshaei, H and Lavroff, J and Kianejad, SS and Davis, MR
Keywords: trimaran, motion response, CFD simulations, regular waves
Journal or Publication Title: Royal Institution of Naval Architects. Transactions. Part A. International Journal of Maritime Engineering
Publisher: Royal Institution of Naval Architects
ISSN: 1479-8751
Copyright Information:

© 2020 The Royal Institution of Naval Architects

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