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Wave-piercing catamaran transom stern ventilation process

Haase, M; Binns, J; Thomas, G; Bose, N; (2016) Wave-piercing catamaran transom stern ventilation process. Ship Technology Research , 63 (2) pp. 71-80. 10.1080/09377255.2015.1119922. Green open access

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Abstract

The new class of highly fuel-efficient medium-speed catamarans operate at speeds where the transom is partially or fully ventilated, hence it is important to understand the characteristics of the wake for resistance prediction. Unsteady Reynolds-Averaged Navier Stokes simulations were used to simulate the flow around a 98 m catamaran, at both model and full scale, and compared to model test results for a 1:22 scale model. A non-shedding squashed horseshoe vortex was found to build up in the stagnant zone past the vessel, with the transom running dry at transom draft Froude numbers of 2.5 in model test experiments and at transom draft Froude numbers of 2.4 in numerical simulations. For full-scale Reynolds numbers, ventilation occurred at transom draft Froude numbers of 2.2. Finally, unsteady Reynolds-Averaged Navier Stokes simulations are capable of accurately predicting the recirculating flow in the wake of the vessel and the state of transom ventilation.

Type: Article
Title: Wave-piercing catamaran transom stern ventilation process
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/09377255.2015.1119922
Publisher version: http://dx.doi.org/10.1080/09377255.2015.1119922
Language: English
Additional information: This is an Accepted Manuscript of an article published by Taylor & Francis in Ship Technology Research on 21 April 2016, available online: http://www.tandfonline.com/10.1080/09377255.2015.1119922.
Keywords: Transom ventilation, Wave-piercing catamaran, Medium-speed catamaran, Unsteady RANS simulation, Full-scale CFD, Flow visualisation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1520219
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