Journal article
Numerical investigation of the seakeeping behavior of a catamaran advancing in regular head waves
Ocean engineering, Vol.38(16), pp.1806-1822
2011
DOI: 10.1016/j.oceaneng.2011.09.003
Abstract
A numerical study was undertaken in order to assess the capability of an unsteady RANS code to predict the seakeeping characteristics of a high-speed multi-hull vessel in high sea states. Numerical analysis includes evaluation of ship motions, effects of wave steepness on ship response, catamaran natural frequency and added resistance in waves. Computations were performed for the DELFT 372 catamaran by the URANS solver CFDSHIP-Iowa V.4. The code was validated with encouraging results for high ship speeds (0.3≤
Fn≤0.75) and high wave amplitudes (0.025≤
Ak≤0.1). Comparison with strip theory solutions shows that the RANS method predicts ship motions with higher accuracy and allows the detection of nonlinear effects. Current computations evidence that heave peaks occur at resonance for all
Fn, and reach the absolute maximum at
Fn=0.75. Maximum pitch occurs at frequencies lower than resonance, for each speed, and absolute maximum occurs at medium
Fn=0.6. Maximum added resistance,
R
aw
, was computed at
Fn=0.45, which, interestingly, is near the catamaran
Fn
coincidence
. Overall, we found similar results as
Simonsen et al. (2008) for KCS containership, though, herein, a multi-hull geometry and higher speeds were tested. Also, our results are useful to further evaluate the exciting forces and their correlation with
f
e
and
λ/
L
pp
.
► We modeled the behavior of a high-speed catamaran in high sea states. ► We used a URANS code and comparison with linear theory included. ► URANS predictions are accurate and allow the detection of nonlinear effects. ► Maximum ship motions occur at resonance frequency for all speed values. ► Results useful to evaluate exciting forces and their correlation with
f
e
and
λ/
L
pp
.
Details
- Title: Subtitle
- Numerical investigation of the seakeeping behavior of a catamaran advancing in regular head waves
- Creators
- Teresa Castiglione - Department of Mechanical Engineering, Via Pietro Bucci, Cubo 45C, University of Calabria, Arcavacata di Rende, Cosenza, ItalyFrederick Stern - IIHR-Hydroscience and Engineering, University of Iowa, Iowa City, IA 52242-1585, USASergio Bova - Department of Mechanical Engineering, Via Pietro Bucci, Cubo 45C, University of Calabria, Arcavacata di Rende, Cosenza, ItalyManivannan Kandasamy - IIHR-Hydroscience and Engineering, University of Iowa, Iowa City, IA 52242-1585, USA
- Resource Type
- Journal article
- Publication Details
- Ocean engineering, Vol.38(16), pp.1806-1822
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/j.oceaneng.2011.09.003
- ISSN
- 0029-8018
- eISSN
- 1873-5258
- Language
- English
- Date published
- 2011
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984064575602771
Metrics
17 Record Views