NDLI: Single- and multiobjective design optimization of a fast multihull ship: numerical and experimental results

Content Provider	Springer Nature Link
Author	Tahara, Yusuke Peri, Daniele Campana, Emilio Fortunato Stern, Frederick
Copyright Year	2011
Abstract	Numerical optimization of the initial design of a fast catamaran (high-speed sealift research model B, HSSL-B) has been carried out through a simulation-based design (SBD) framework, based on an advanced free-surface unsteady Reynolds-averaged Navier–Stokes (URANS) solver and a potential flow solver, and global optimization (GO) algorithms. The potential flow computational fluid dynamics (CFD) SBD was used to guide the more expensive URANS CFD SBD. The fluid-dynamic analysis of the flow past the catamaran proved that the use of the URANS solver was fundamental in dealing with the multihull interference problem. In the case investigated, the separation distance was small and the viscous flow quite distorted by the proximity of the hulls, so that only viscous solvers could correctly capture the flow details. Sinkage and trim effects, due to the high speed range and again to the small separation distance investigated, are also relevant. The initial HSSL-B geometry and three optimization problems, including single- and multiobjective optimization problems, proposed by designers from Bath Iron Works, were successfully optimized/solved, and finally an experimental campaign was carried out to validate the optimal design. A new verification and validation methodology for assessing uncertainties and errors in simulation-based optimization was used based on the trends, i.e., the differences between the numerically predicted improvement of the objective function and the actual improvement measured in a dedicated experimental campaign, including consideration of numerical and experimental uncertainties. Finally, the success of the optimization processes was confirmed by the experimental measurements, and trends for total resistance, sinkage, and trim between the original and optimal designs were numerically and experimentally verified and validated.
Starting Page	412
Ending Page	433
Page Count	22
File Format	PDF
ISSN	09484280
Journal	Journal of Marine Science and Technology
Volume Number	16
Issue Number	4
e-ISSN	14378213
Language	English
Publisher	Springer Japan
Publisher Date	2011-08-23
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fast multihull ship Simulation-based design CFD-based single- and multiobjective optimization Derivative-free optimization algorithm Total resistance minimization Seakeeping merit function minimization Verification and validation Engineering Fluid Dynamics Automotive Engineering Mechanical Engineering Engineering Design Offshore Engineering
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering Mechanics of Materials Mechanical Engineering

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