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Title: Estimation of flows around a full-scale ship by structured overset RaNS code “NAGISA”
Language: English
Authors: Sakamoto, Nobuaki 
Kobayashi, Hiroshi 
Ohashi, Kunihide 
Editor: Fluiddynamik und Schiffstheorie M-8 
Keywords: Computational Fluid Dynamics (CFD);Full scale;Overset grid
Issue Date: Sep-2019
Source: 11th International Workshop on Ship and Marine Hydrodynamics (IWSH2019), Paper 80
Abstract (english): 
Viscous CFD simulations are carried out for conventional single-screw container ship “Sydney Express” in model and full scale using in-house finite volume RaNS solver NAGISA developed at NMRI. Structured grids are independently generated around hull and rudder, and domain connectivity information between the two blocks are calculated by in-house overset grid assembler UP_GRID also developed at NMRI. Rigorous validations are made both in model and full scale using available experimental data. In model scale, resistance and self propulsion coefficients are both well predicted by the present computation. Computational accuracy in nominal and total wake specifically at 12 o’clock and near the boss must be improved. In full scale, all the computational results and their validation against full scale measurement data indicate the importance of treatment of wall roughness. When the roughness is taken into consideration in full scale simulation, it contributes to improve computational accuracy in estimating propeller rotation speed and distribution of axial component of total wake in front of the propeller better than those of estimated without roughness.
Conference: 11th International Workshop on Ship and Marine Hydrodynamics (IWSH2019) 
DOI: 10.15480/882.3371
Document Type: Chapter/Article (Proceedings)
License: In Copyright In Copyright
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