TY - GEN
T1 - Forces, ship motions and velocity wake field for KRISO container ship model in regular head waves
AU - Alfaz Hossain, Md
AU - Wu, Ping Chen
AU - Shibano, Yusuke
AU - Toda, Yasuyuki
N1 - Publisher Copyright:
Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)
PY - 2018
Y1 - 2018
N2 - Ship motion responses and added resistance in waves have been predicted by a wide variety of computational tools including potential and viscous flow methods. However, to validate the computational flow field is still challenging. In the present work, ship vertical motions, added resistance and detailed wake flow field for a 3.2m KRISO container ship (KCS) model in waves have been predicted by simulation and experiment. The force, motions and S-PIV measurement were conducted in towing tank using same ship model. The viscous flow simulation was performed by CFDSHIP-Iowa with rigid body motion solver and dynamic overset grid. The ship heave and pitch motions were considered in wave and in calm water. The current result shows good agreement between simulation and experiment for the trend of the motion responses and added resistance. As wave length increases, heave and pitch motion amplitudes increase from near zero to almost constant one but the added resistance coefficient raises until the peak at λ/L=1.15. For the nominal wake at propeller plane, the velocity distribution pattern in short waves, e.g. λ/L=0.65, is similar with the calm water one. In long waves such as λ/L=1.15, the bilge vortex moves up and down relative to the stern vertical motions and remains always inside the propeller radius. The secondary vortex is shedding above and below the dummy boss inside the low speed area. The oscillation of nominal wake factor in waves is almost sinusoidal unlike the KVLCC2 one analyzed in our previous study.
AB - Ship motion responses and added resistance in waves have been predicted by a wide variety of computational tools including potential and viscous flow methods. However, to validate the computational flow field is still challenging. In the present work, ship vertical motions, added resistance and detailed wake flow field for a 3.2m KRISO container ship (KCS) model in waves have been predicted by simulation and experiment. The force, motions and S-PIV measurement were conducted in towing tank using same ship model. The viscous flow simulation was performed by CFDSHIP-Iowa with rigid body motion solver and dynamic overset grid. The ship heave and pitch motions were considered in wave and in calm water. The current result shows good agreement between simulation and experiment for the trend of the motion responses and added resistance. As wave length increases, heave and pitch motion amplitudes increase from near zero to almost constant one but the added resistance coefficient raises until the peak at λ/L=1.15. For the nominal wake at propeller plane, the velocity distribution pattern in short waves, e.g. λ/L=0.65, is similar with the calm water one. In long waves such as λ/L=1.15, the bilge vortex moves up and down relative to the stern vertical motions and remains always inside the propeller radius. The secondary vortex is shedding above and below the dummy boss inside the low speed area. The oscillation of nominal wake factor in waves is almost sinusoidal unlike the KVLCC2 one analyzed in our previous study.
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M3 - Conference contribution
AN - SCOPUS:85053448987
SN - 9781880653876
T3 - Proceedings of the International Offshore and Polar Engineering Conference
SP - 226
EP - 233
BT - Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018
PB - International Society of Offshore and Polar Engineers
T2 - 28th International Ocean and Polar Engineering Conference, ISOPE 2018
Y2 - 10 June 2018 through 15 June 2018
ER -