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    Item type:Publication, Access status: with files ,
    Comparative study on different CFD solvers for analysis of ship added resistance
    (2019-09)
    Kim, Byung-Soo
    ;
    Yang, Kyung-Kyu
    ;
    Zhu, Zhang
    ;
    Kim, Yonghwan
    This study deals with motion responses and the added resistance of the ship in waves using computational fluid dynamics (CFD). In this study, motion response and the added resistance of the modified blunt Wigley are investigated using two types of CFD program: SNU-MHL-CFD (Seoul National University Marine Hydrodynamics Laboratory CFD) and OpenFOAM. SNU-MHL-CFD is Euler equation solver which is an in-house code based on a Cartesian-grid and immersed boundary method. OpenFOAM is Reynolds-Averaged Navier-Stokes (RANS) equation solvers which is an open source library. Before solving the ship motion in waves, hydrodynamic coefficients are calculated by forced heave and pitch motions and wave excitation forces/moments are computed from wave diffraction problem without any hull motion. Three types of solvers are used: two previously mentioned solvers and additionally commercial software, Star-CCM+. These results are validated with the experimental data. Finally, ship motion responses and added resistance in waves are compared with available experimental data and their computational costs are compared.
    Publicationtype: Conference Paper
      170  310
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    Item type:Publication, Access status: with files ,
    CFD analysis of ship oblique towing in waves
    (2019-09)
    Zhu, Zhang
    ;
    Lee, Jae-Hoon
    ;
    Kim, Yonghwan
    This paper applies Computational Fluid Dynamics (CFD) method to study the wave effect on ship oblique towing test. Obliquely towed model is S-175 bare hull with an oblique angle of 10 degrees. The ship motion involves incoming head waves of various wavelengths, and overset mesh method is used to simulate wave-induced ship motion. First part of this study tests the grid sensitivity of present CFD model, observing the near-wall grid effect on body forces. Second part is about the computation on ship oblique towing motion in waves. Ship motion and wave drift force are compared with experiment, and further CFD analysis investigates how oblique condition affects wave pattern and the distribution of fluid turbulent kinetic energy.
    Publicationtype: Conference Paper
      116  287