Estimation of flows around a full-scale ship by structured overset RaNS code “NAGISA”

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.

Subjects

Computational Fluid Dynamics (CFD)

Full scale

Overset grid

DDC Class

004: Informatik

600: Technik

620: Ingenieurwissenschaften

Lizenz

http://rightsstatements.org/vocab/InC/1.0/

Name

paper_0080_file_0340_Estimation_of_Flows_around_a_Full_Scale_Ships_by_Structured_Over.pdf

Size

3.1 MB

Format

Adobe PDF

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Estimation of flows around a full-scale ship by structured overset RaNS code “NAGISA”