Journal article
URANS simulations of catamaran interference in shallow water
Journal of marine science and technology, Vol.19(1), pp.33-51
07/25/2013
DOI: 10.1007/s00773-013-0230-5
Abstract
This paper investigates the interference effects of wave systems on a multi-hull vessel in shallow water. A numerical analysis is made using the URANS code CFDSHIP-Iowa V.4 on the DELFT Catamaran model 372. The test matrix for numerical computations includes two separation distances (
s
= 0.17; 0.23) and the depth values of
h
/
T
= 8.2, 2.5 and 2, at several speeds ranging within
Fr
H
= 0.775–1.739. Numerical results are compared with the experimental data of the Bulgarian Ship Hydrodynamic Center, and verification and validation for resistance, sinkage and trim are also performed. Results show that, at critical speed (
Fr
H
≈ 1), the presence of a finite depth significantly affects the catamaran total resistance, which, in shallower water, increases considerably with respect to deep water. At low
h
/
T
, small effects of the water depth on resistance occur at subcritical and supercritical speeds. The interference effects seem to be more relevant in shallow, rather than in deep water, with maximum IF values registered at critical speeds (
Fr
H
≈ 1). Similarly to deep water, the lower the separation distance the greater the interference value. Moreover, in shallow water some negative interference is observed at
Fr
> 0.5. Wave patterns and wave profiles are analyzed and a comparison is made between several configurations of catamaran and a mono-hull vessel, in order to analyze how water depth and separation distance determine resistance and interference. Finally, a vortex instability study is also included.
Details
- Title: Subtitle
- URANS simulations of catamaran interference in shallow water
- Creators
- Teresa Castiglione - University of CalabriaWei He - University of IowaFrederick Stern - University of IowaSergio Bova - University of Calabria
- Resource Type
- Journal article
- Publication Details
- Journal of marine science and technology, Vol.19(1), pp.33-51
- Publisher
- Springer Japan
- DOI
- 10.1007/s00773-013-0230-5
- ISSN
- 0948-4280
- eISSN
- 1437-8213
- Language
- English
- Date published
- 07/25/2013
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984196623402771
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