Journal article
URANS study of Delft catamaran total/added resistance, motions and slamming loads in head sea including irregular wave and uncertainty quantification for variable regular wave and geometry
Ocean engineering, Vol.74, pp.189-217
12/01/2013
DOI: 10.1016/j.oceaneng.2013.06.020
Abstract
A methodology is assessed for uncertainty quantification (UQ) of resistance, motions and slamming loads in variable regular wave representing a given sea state, and compared to irregular wave (benchmark) and deterministic regular wave studies. UQ is conducted over the joint distribution of wave period and height; the irregular wave inlet boundary condition is based on the wave energy spectrum; deterministic study is conducted at the most probable condition. Application to the high-speed Delft Catamaran at Fr=0.5 and sea state 6 is presented and discussed. Deterministic regular wave study shows an average error for design optimization-related quantities (expected value of resistance, motions amplitude and slamming loads) equal to 25%. Variable regular wave UQ shows an average error close to 6%, providing in addition output distributions. Extension to uncertain design through Karhunen–Loève expansion is presented and discussed; variable geometry studies show a potential reduction of 6.5% for calm water resistance and 3.9% for resistance in wave, with small variations in motions amplitudes; an increase of 6.4% in maximum slamming load is experienced by the reduced-resistance geometry, revealing a trade-off between performances and loads. UQ with metamodels reveals ordinary Kriging and polyharmonic spline as the most effective metamodels overall.
•Irregular wave URANS is presented for resistance, motions, slamming loads.•UQ approach using variable regular wave is introduced.•Comparison of UQ with irregular wave shows close agreement.•UQ is extended to variable geometry through Karhunen–Loeve expansion.•Metamodels are used for UQ and an overall ranking is given.
Details
- Title: Subtitle
- URANS study of Delft catamaran total/added resistance, motions and slamming loads in head sea including irregular wave and uncertainty quantification for variable regular wave and geometry
- Creators
- Wei He - University of IowaMatteo Diez - University of IowaZaojian Zou - Shanghai Jiao Tong UniversityEmilio F Campana - National Research CouncilFrederick Stern - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Ocean engineering, Vol.74, pp.189-217
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.oceaneng.2013.06.020
- ISSN
- 0029-8018
- eISSN
- 1873-5258
- Language
- English
- Date published
- 12/01/2013
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196624302771
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