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Research Papers: CFD and VIV

# Wave Drift Forces' Calculation on Two Floating Bodies Based on the Boundary Element Method—Attempt for Improvement of the Constant Panel Method

[+] Author and Article Information
Qiao Li

Institute of Industrial Science,
The University of Tokyo,
Kashiwa 2778574, Japan;
Graduate School of Engineering,
Osaka Prefecture University,
Osaka 5998531, Japan
e-mail: liqiao23@hotmail.com

Yasunori Nihei

Graduate School of Engineering,
Osaka Prefecture University,
Osaka 5998531, Japan
e-mail: nihei@marine.osakafu-u.ac.jp

Paper presented at the 2016 ASME 35th International Conference on Ocean, Offshore, and Arctic Engineering (OMAE2016), Busan, Korea, June 19-24, 2016,Paper No. OMAE2016-54263.Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 11, 2017; final manuscript received November 30, 2018; published online January 17, 2019. Assoc. Editor: Ould el Moctar.

J. Offshore Mech. Arct. Eng 141(4), 041801 (Jan 17, 2019) (10 pages) Paper No: OMAE-17-1107; doi: 10.1115/1.4042180 History: Received July 11, 2017; Revised November 30, 2018

## Abstract

An improved constant panel method for more accurate evaluation of wave drift forces and moment is proposed. The boundary element method (BEM) of solving boundary integral equations is used to calculate velocity potentials of floating bodies. The equations are discretized by either the higher-order boundary element method or the constant panel method. Though calculating the velocity potential via the constant panel method is simple, the results are unable to accurately evaluate wave drift forces and moment. An improved constant panel method is introduced to address these issues. The improved constant panel method can, without difficulty, employ the near-field method to evaluate wave drift forces and moment, especially for multiple floating bodies. Results of the new evaluation method will be compared with other evaluation method. Additionally, hydrodynamic interaction between multiple floating bodies will be assessed.

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## References

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## Figures

Fig. 2

Local coordinate system

Fig. 1

Calculating domain

Fig. 3

Evaluation points used in the conventional and the new constant panel method

Fig. 4

Isoparametric elements

Fig. 6

Wave exciting forces and moments of single body (β = 0 deg)

Fig. 7

Wave exciting forces and moments of single body (β = 30 deg)

Fig. 8

Wave drift force of single body (β = 0 deg)

Fig. 9

Wave drift forces and moment of single body (β = 30 deg)

Fig. 5

Calculation model of an ellipsoid body

Fig. 10

Calculation model of two ellipsoid bodies in tandem

Fig. 11

Wave exciting forces and moments of body = A in different DX

Fig. 12

Wave exciting forces and moments of body = B in different DX

Fig. 13

Surge wave drift forces of body-A in different DX

Fig. 14

Surge wave drift forces of body-B in different DX

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