Study on weakly nonlinear motions of ship advancing in waves and influences of steady ship wave

Chen, Xi; Zhu, Renchuan; Zhao, Ji; Zhou, Wenjun; Jun, Fan

doi:10.1016/j.oceaneng.2017.12.053

Cited by 22 publications

(10 citation statements)

References 10 publications

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“…As a result, this treatment cannot accurately reflect the interaction between the steady flow and the unsteady flow in the body surface boundary condition. On the other hand, as explained in [9], the larger contribution of the steady velocity potential in both the body surface and free surface boundary conditions at low frequencies also leads to relatively larger deviations, but these effects are not fully considered in the method using DB flow. Therefore, the coupling effects between the nonlinear steady flow and the unsteady flow, which are reflected in both the free surface boundary condition and the m j terms in the body surface boundary condition, are quite important for the prediction of hydrodynamic coefficients, especially at low frequencies.…”

Section: Results Of the Diffraction Problemmentioning

confidence: 99%

“…In their studies, the mean second-order wave force was evaluated by Rankine panel method using NK or DB linearization, which was then treated as the input force in the equations for predicting maneuvering behavior. However, these two linearization methods, as described in [4], can be justified in the case of a slender ship, but they are not suitable for blunt bodies or ships moving at high speeds [9]. In light of the limitations of the NK and DB linearizations, works addressing ship hydrodynamics by using steady wave-making flow as basic flow for linearization were carried out; e.g., Gao and Zou [10] computed the linear steady wave-making flow beforehand and then applied the results to solve the diffraction and radiation problems.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, researchers have considered nonlinear steady flow to study the interactions between the linear periodic wave-induced flow and the nonlinear steady flow caused by the ship's forward speed in calm water, such as the studies by Bunnik [11], Söding et al [12] and Chillcce and el Moctar [13] in frequency domain. As for the time domain method, studies can be found in Riesner et al [14], Riesner and el Moctar [15] and Chen et al [9]. Though the transient effect of flow can be investigated in time domain, the boundary integral equation should be solved at each time step, which is more computationally expensive than that with frequency domain method.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Mei

Candries

Lataire

et al. 2020

JMSE

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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 m j 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.

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Section: Results Of the Diffraction Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Mei

Candries

Lataire

et al. 2020

JMSE

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“…Untuk memperkirakan kinerja gerak crane vessel, variasi sea state diberikan dalam analisis penelitian seperti yang dilakukan oleh (X. Chen et al, 2018;Yang et al, 2019). Dalam kode (Det Norske Veritas, 2014), operasi pengangkatan stuktur dalam laut bergelombang oleh crane vessel dilakukan tidak lebih dari tinggi gelombang signifikan sebesar 2.0 m, sehingga kegiatan decommissioning offshore structure dilakukan pada kondisi sea state yang relatif kecil.…”

Section: Pendahuluanunclassified

Analisis Respon Gerak Floating Crane Barge Untuk Decommissioning Struktur Lepas Pantai

et al. 2021

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Penerapan floating crane barge memiliki potensi besar untuk operasi pengangkatan struktur dalam mendukung decommissioning anjungan lepas pantai pasca operasi. Respon gerak floating crane barge dalam perairan bergelombang selama operasi pengangkatan struktur di laut menjadi faktor penting dalam menunjang operasional yang aman. Pada penelitian ini, respon gerak dinamis floating crane barge terhadap gelombang dilakukan dengan simulasi eksperimen di laboratorium maneuvering ocean basin. Model uji barge yang dilengkapi dengan struktur crane boom sederhana dibuat dengan perbandingan skala 1:28. Respon gerak model uji dievaluasi dengan kondisi gelombang reguler dan gelombang irreguler. Karakteristik gerak amplitudo dijasikan dalam grafik RAO yang mana hasilnya menunjukkan kesesuaian antara gelombang reguler dan irreguler. Respon gerak terhadap gelombang acak mengalami peningkatan secara signifikan terjadi dari kondisi gelombang Hs = 0.50 m, Tp = 4.00 s ke kondisi gelombang Hs = 1.00 m, Tp = 5.50 s untuk heave sebesar 2.8 kali, untuk roll sebesar 2.5 kali dan untuk pitch sebesar 1.5 kali.

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“…Nakos [8] carried out the numerical prediction of ship heave and pitch motion responses via high-order Rankine source method in the paper [9]. In the time domain, Chen et al [10] adopted three-dimensional Rankine source function to obtain the hydrodynamic problems and motions of ship in regular waves. However, radiation condition is hard to achieve in short wavelengths for Rankine source method.…”

Section: Introductionmentioning

confidence: 99%

A Practical Approach to Numerically Predicting a Maneuvering Vessel in Waves Oriented to Maritime Simulator

Liu

Cai

et al. 2020

Mathematical Problems in Engineering

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To improve the behavioral realism of maritime simulator, the mathematical model of ship heave and pitch motion in regular waves is proposed. To avoid the influence of irregular frequency by two-dimensional Frank source and sink distribution method, the multiparameter conformal mapping method was adopted to solve the hydrodynamic problem of ship’s transverse sections, and then the integration of the hydrodynamic coefficients and the wave exciting forces for the whole ship hull was obtained using the Salvesen–Tuck–Faltinsen (STF) strip method. The Abkowitz model was used for the horizontal maneuverability motion equations, and the ship heave and pitch motion mathematical model in regular waves can be built considering the maneuvering factors. To verify the credibility and applicability of the improved model, the Mariner vessel with a Froude number of 0.2 was taken as the simulation case; when Mariner vessel sails in head waves, the maximum relative error between the calculated results and the experimental results is 23.6% for amplitude response operators of ship heave and pitch motion, and the calculated results and the experimental results have the same trend. When turning maneuvers in regular waves are carried out, the time history of ship pitch and pitch motions in regular waves does not show the sinusoidal periodic change any more, but the time history of heave and pitch motion still possesses periodic change to some extent, at which the period is about the time required for the turning motion to finish a circle. When turning maneuvers are carried out for 3000 seconds, the time required for computer operation is about 487.6 s, and the real-time requirements of maritime simulator are satisfied. Thus, the mathematical model of ship heave and pitch motion established in this paper can be effectively applied to the maritime simulator.

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Study on weakly nonlinear motions of ship advancing in waves and influences of steady ship wave

Cited by 22 publications

References 10 publications

Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Numerical Study on Hydrodynamics of Ships with Forward Speed Based on Nonlinear Steady Wave

Analisis Respon Gerak Floating Crane Barge Untuk Decommissioning Struktur Lepas Pantai

A Practical Approach to Numerically Predicting a Maneuvering Vessel in Waves Oriented to Maritime Simulator

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