TY - GEN
T1 - A two-dimensional numerical study of radiation of piston mode fluid resonance in a narrow gap
AU - Tan, Lei
AU - Ikoma, Tomoki
AU - Aida, Yasuhiro
AU - Masuda, Koichi
N1 - Funding Information:
The authors would like to acknowledge the support of the Nihon University College of Science and Technology Project for Research, and State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology (No. LP2024).
Publisher Copyright:
© 2021 by the International Society of Offshore and Polar Engineers (ISOPE).
PY - 2021
Y1 - 2021
N2 - Radiation damping may play an important role in the prediction of gap resonance amplitude by potential flow models. In this paper, the radiation of the gap resonance between twin fixed floating boxes is numerically studied by using a linear potential flow model in frequency domain. An impermeable lid is forced to heave at the free surface in the gap. The characteristics of its added mass and radiation damping, and radiation wave amplitude in the far field are calculated under various geometric conditions. Moreover, the ratio of radiation damping to the viscous damping due to wall friction and/or flow separation is quantified. We find that the ratio of the viscous damping force due to wall friction to radiation damping is approximately 34%~43%, and that due to flow separation to radiation damping is about 140%~320%. The results well explain the prediction performance of potential flow models with/without the viscous damping due to wall friction and/or flow separation.
AB - Radiation damping may play an important role in the prediction of gap resonance amplitude by potential flow models. In this paper, the radiation of the gap resonance between twin fixed floating boxes is numerically studied by using a linear potential flow model in frequency domain. An impermeable lid is forced to heave at the free surface in the gap. The characteristics of its added mass and radiation damping, and radiation wave amplitude in the far field are calculated under various geometric conditions. Moreover, the ratio of radiation damping to the viscous damping due to wall friction and/or flow separation is quantified. We find that the ratio of the viscous damping force due to wall friction to radiation damping is approximately 34%~43%, and that due to flow separation to radiation damping is about 140%~320%. The results well explain the prediction performance of potential flow models with/without the viscous damping due to wall friction and/or flow separation.
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M3 - Conference contribution
AN - SCOPUS:85115209754
SN - 9781880653821
T3 - Proceedings of the International Offshore and Polar Engineering Conference
SP - 1680
EP - 1686
BT - Proceedings of the 31st International Ocean and Polar Engineering Conference, ISOPE 2021
PB - International Society of Offshore and Polar Engineers
T2 - 31st International Ocean and Polar Engineering Conference, ISOPE 2021
Y2 - 20 June 2021 through 25 June 2021
ER -