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Numerical study on hydrodynamics of ships with forward speed based on nonlinear steady wave

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Abstract
In this paper, an improved potential flow model is proposed for the hydrodynamic analysis of ships advancing in waves. A desingularized Rankine panel method, which has been improved with the added effect of nonlinear steady wave-making (NSWM) flow in frequency domain, is employed for 3D diffraction and radiation problems. Non-uniform rational B-splines (NURBS) are used to describe the body and free surfaces. The NSWM potential is computed by linear superposition of the first-order and second-order steady wave-making potentials which are determined by solving the corresponding boundary value problems (BVPs). The so-called mj terms in the body boundary condition of the radiation problem are evaluated with nonlinear steady flow. The free surface boundary conditions in the diffraction and radiation problems are also derived by considering nonlinear steady flow. To verify the improved model and the numerical method adopted in the present study, the nonlinear wave-making problem of a submerged moving sphere is first studied, and the computed results are compared with the analytical results of linear steady flow. Subsequently, the diffraction and radiation problems of a submerged moving sphere and a modified Wigley hull are solved. The numerical results of the wave exciting forces, added masses, and damping coefficients are compared with those obtained by using Neumann–Kelvin (NK) flow and double-body (DB) flow. A comparison of the results indicates that the improved model using the NSWM flow can generally give results in better agreement with the test data and other published results than those by using NK and DB flows, especially for the hydrodynamic coefficients in relatively low frequency ranges.
Keywords
nonlinear steady flow, desingularized Rankine panel method, forward speed, radiation and diffraction, DIFFRACTION, RADIATION, PREDICTION

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MLA
Mei, Tianlong, et al. “Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave.” JOURNAL OF MARINE SCIENCE AND ENGINEERING, vol. 8, no. 2, 2020, doi:10.3390/jmse8020106.
APA
Mei, T., Candries, M., Lataire, E., & Zou, Z. (2020). Numerical study on hydrodynamics of ships with forward speed based on nonlinear steady wave. JOURNAL OF MARINE SCIENCE AND ENGINEERING, 8(2). https://doi.org/10.3390/jmse8020106
Chicago author-date
Mei, Tianlong, Maxim Candries, Evert Lataire, and Zaojian Zou. 2020. “Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave.” JOURNAL OF MARINE SCIENCE AND ENGINEERING 8 (2). https://doi.org/10.3390/jmse8020106.
Chicago author-date (all authors)
Mei, Tianlong, Maxim Candries, Evert Lataire, and Zaojian Zou. 2020. “Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave.” JOURNAL OF MARINE SCIENCE AND ENGINEERING 8 (2). doi:10.3390/jmse8020106.
Vancouver
1.
Mei T, Candries M, Lataire E, Zou Z. Numerical study on hydrodynamics of ships with forward speed based on nonlinear steady wave. JOURNAL OF MARINE SCIENCE AND ENGINEERING. 2020;8(2).
IEEE
[1]
T. Mei, M. Candries, E. Lataire, and Z. Zou, “Numerical study on hydrodynamics of ships with forward speed based on nonlinear steady wave,” JOURNAL OF MARINE SCIENCE AND ENGINEERING, vol. 8, no. 2, 2020.
@article{8650731,
  abstract     = {{In this paper, an improved potential flow model is proposed for the hydrodynamic analysis of ships advancing in waves. A desingularized Rankine panel method, which has been improved with the added effect of nonlinear steady wave-making (NSWM) flow in frequency domain, is employed for 3D diffraction and radiation problems. Non-uniform rational B-splines (NURBS) are used to describe the body and free surfaces. The NSWM potential is computed by linear superposition of the first-order and second-order steady wave-making potentials which are determined by solving the corresponding boundary value problems (BVPs). The so-called mj terms in the body boundary condition of the radiation problem are evaluated with nonlinear steady flow. The free surface boundary conditions in the diffraction and radiation problems are also derived by considering nonlinear steady flow. To verify the improved model and the numerical method adopted in the present study, the nonlinear wave-making problem of a submerged moving sphere is first studied, and the computed results are compared with the analytical results of linear steady flow. Subsequently, the diffraction and radiation problems of a submerged moving sphere and a modified Wigley hull are solved. The numerical results of the wave exciting forces, added masses, and damping coefficients are compared with those obtained by using Neumann–Kelvin (NK) flow and double-body (DB) flow. A comparison of the results indicates that the improved model using the NSWM flow can generally give results in better agreement with the test data and other published results than those by using NK and DB flows, especially for the hydrodynamic coefficients in relatively low frequency ranges.}},
  articleno    = {{106}},
  author       = {{Mei, Tianlong and Candries, Maxim and Lataire, Evert and Zou, Zaojian}},
  issn         = {{2077-1312}},
  journal      = {{JOURNAL OF MARINE SCIENCE AND ENGINEERING}},
  keywords     = {{nonlinear steady flow,desingularized Rankine panel method,forward speed,radiation and diffraction,DIFFRACTION,RADIATION,PREDICTION}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{18}},
  title        = {{Numerical study on hydrodynamics of ships with forward speed based on nonlinear steady wave}},
  url          = {{http://dx.doi.org/10.3390/jmse8020106}},
  volume       = {{8}},
  year         = {{2020}},
}

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