This paper employs computational tools to predict power increase (or speed loss) and propulsion performances in waves of KVLCC2. Two-phase unsteady Reynolds averaged Navier-Stokes equations have been solved using finite volume method; and a realizable k-ε model has been applied for the turbulent closure. The free-surface is obtained by solving a VOF equation. Sliding mesh method is applied to simulate the flow around an operating propeller. Towing and self-propulsion computations in calm water are carried out to obtain the towing force, propeller rotating speed, thrust and torque at the self-propulsion point. Towing computations in waves are performed to obtain the added resistance. The regular short head waves of λ/LPP = 0.6 with 4 wave steepness of H/λ = 0.007, 0.017, 0.023 and 0.033 are taken into account. Four methods to predict speed-power relationship in waves are discussed; Taylor expansion, direct powering, load variation, resistance and thrust identity methods. In the load variation method, the revised ITTC-78 method based on the ‘thrust identity’ is utilized to predict propulsive performances in full scale. The propulsion performances in waves including propeller rotating speed, thrust, torque, thrust deduction and wake fraction, propeller advance coefficient, hull, propeller open water, relative rotative and propulsive efficiencies, and delivered power are investigated. Keywords: Power increase, Speed loss, Propulsion performances, Regular short head waves, KVLCC2, CFD, Taylor expansion, Direct powering, Load variation, Resistance and thrust identity method


    Access

    Download


    Export, share and cite



    Title :

    Comparative study of prediction methods of power increase and propulsive performances in regular head short waves of KVLCC2 using CFD


    Contributors:
    Cheol-Min Lee (author) / Jin-Hyeok Seo (author) / Jin-Won Yu (author) / Jung-Eun Choi (author) / Inwon Lee (author)


    Publication date :

    2019




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Comparative study on the prediction of speed-power-rpm of the KVLCC2 in regular head waves using model tests

    Jin-Won Yu / Cheol-Min Lee / Jin-Hyeok Seo et al. | DOAJ | 2021

    Free access

    TURNING CHARACTERISTICS OF KVLCC2 IN REGULAR HEAD AND BEAM WAVES

    Kim, D. J. / Yun, K. / Park, J. Y. et al. | TIBKAT | 2018


    A numerical investigation on the nominal wake of KVLCC2 model ship in regular head waves

    Hyun-Woo Shin / Kwang-Jun Paik / Yoon-Ho Jang et al. | DOAJ | 2020

    Free access


    Asymmetric Stern Modifications for KVLCC2

    Gudla, A. Surya Teja / Kalyanam, S. Srinivas / Bhattacharyya, Anirban et al. | TIBKAT | 2021