Abstract
In this paper, we provide new experimental data of the wave-induced steady forces (the added resistance, wave-induced steady lateral force, and yaw moment) acting on a full hull ship in regular waves, and we verify the validity of existing prediction methods for wave-induced steady forces by performing comparisons with results obtained experimentally. For the prediction methods, we consider the zero-speed three-dimensional panel method (3DPM) and the method based on formulas of the wave-induced steady forces that are expressed using the Kochin-function assuming a slender ship (strip theory-based Kochin-function method: SKFM). The results show that the calculation accuracy obtained using 3DPM and SKFM for added resistance and steady lateral force is acceptable for practical purposes although the accuracy is insufficient for the steady yaw moment. In order to confirm the applicability of both methods to the problem of maneuvering in waves, we predict the turning motions of the ship in irregular waves using the calculation results obtained by 3DPM and SKFM for the wave-induced steady forces, and we compare the turning motions with the free-running model test results. Both methods are useful for predicting turning motions in irregular waves.
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Acknowledgements
This study was supported by JSPS KAKENHI Grant No. JP26249135, and a part of this study was conducted as a collaborative research with Class NK (No. 14-29). We would like to thank Dr. A. Matsuda and Mr. M. Shirai for their assistance with the free-running model tests.
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A comparison of added resistance in head waves for other ships
A comparison of added resistance in head waves for other ships
We compared the calculation results of added resistance coefficients in regular head waves by SKFM with the test results conducted in Hiroshima University Towing Tank (length: 100 m, width: 8 m, water depth: 3.5 m). The object ships are a VLCC called KVLCC2 and a container ship called KCS. Table 11 shows the principal particulars of the ship models used in the tank tests. The tests were performed with changing the ship speeds. Figure 15 shows the comparison of the added resistance coefficients for KVLCC2 and KCS. In the cases that the ship speed is relatively small (strictly speaking, \(\tau (\equiv U\omega _{e}/g)\) is smaller than 1/4), the scattering and radiation waves propagate upstream. The wave components influence the wave-height measurement. This is the reason why the fluctuation becomes large in the added resistance results with relatively small speed cases. The calculation results by SKFM roughly agree with the tank test results.
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Yasukawa, H., Hirata, N., Matsumoto, A. et al. Evaluations of wave-induced steady forces and turning motion of a full hull ship in waves. J Mar Sci Technol 24, 1–15 (2019). https://doi.org/10.1007/s00773-018-0537-3
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DOI: https://doi.org/10.1007/s00773-018-0537-3