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 -