On the Increase of the Resistance of a Ship in Rough Seas

Maruo, Hajime

doi:10.2534/jjasnaoe1952.1960.108_5

Cited by 19 publications

(13 citation statements)

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“…The convergence study provides us reference values for choosing the time step and fundamental element size, and proper damping coefficients to obtain convergent results. To verify the accuracy of the present numerical results, they were compared with published experimental [35], analytical [36], and other numerical results [34,37,38]. The force components were determined through performing Fourier analysis on the steady state part of the force histories.…”

Section: Convergence Study and Validationmentioning

confidence: 94%

Numerical Analysis of Combined Wave Radiation and Diffraction on a Floating Barge

Stankovic

et al. 2020

Water

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A two-dimensional boundary element method (BEM) based on the potential flow theory is adopted to study the combined wave radiation and diffraction by a single barge. The wave-body interaction problems are simulated using a mixed Euler-Lagrangian scheme, with fully nonlinear boundary conditions. The numerical schemes are verified through comparing with existing results, which show that both the wave runups on the barge and hydrodynamic forces can be calculated with sufficient accuracy. Cases of a single barge subjected to sway motion and regular waves are studied. The real contribution of this study is the outcomes of the spectral analysis conducted for test cases when wave radiation effects are considered in addition to pure wave diffraction. The cases of sway motion with the same frequency as incident wave are simulated first. It is found that sway motion will reduce the overall horizontal force when the frequency is lower than a critical frequency. After that, the higher the frequency, the bigger the horizontal force increasing effect. When the frequency of sway motion is lower than that of incident wave, in terms of the magnitude of the horizontal force, sway motion of the body will always make the resultant force larger than that of pure diffraction case.

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Section: Convergence Study and Validationmentioning

confidence: 94%

Numerical Analysis of Combined Wave Radiation and Diffraction on a Floating Barge

Stankovic

et al. 2020

Water

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“…It is showed that the two-dimensional wave-current numerical tank has a good characteristic of wave-current combined flow. Secondly, for the verification of the simulated wave forces, the calculation results are compared with Nojiri [9], Maruo [10], and Koo [5], respectively. A surface-piercing body is fixed in the middle of the domain and radius of round corner is 0.064 m. The incident wave height is 0.07 m. In order to capture the wave surface accurately and calculate the wave forces precisely.…”

Section: Model Validationmentioning

confidence: 99%

Hydrodynamic coefficients induced by waves and currents for submerged circular cylinder

Lin

2010

Procedia Engineering

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Hydrodynamic coefficients induced by waves and currents are simulated for a stationary submerged circular cylinder in a twodimensional numerical wave-current tank. In present paper, based on the Reynolds averaged Navier-Stokes equations, a twodimensional numerical tank is developed to simulate the coaction processes. The computational vertical distributions of timeaverage velocity agree well with the experimental data, which indicates that the wave-current numerical tank has a good characteristic of wave-current combined flow. By using time histories of wave force, drift force are calculated. The computational results are also shown to be in good agreement with experimental and numerical results of other researchers. Simulated wave forces are employed to derive drag and inertia coefficients by using least-squares method. The coefficients induced by waves and wave-current flows are compared. The results indicate that the currents have a significant influence on the drag coefficients for submerged circular cylinder.

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“…In terms of the Kochin function, the wave drift forces in the x-and y-axes proposed by Maruo [20] and the drift moment about the z-axis proposed by Newman [21] can be computed. The formulae for the first two components are written as …”

Section: Methodsmentioning

confidence: 99%

Performance Evaluation of an Optimized Floating Breakwater in Oblique Waves with a Higher-Order Boundary Element Method

Mahmuddin¹,

Kashiwagi²

2014

MST

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In the previous study, the optimal performance of a two-dimensional (2D) floating breakwater shape was obtained. The performance of this shape was also confirmed with a model experiment in a towing tank. Moreover, the shape's performance in three dimensions (3D) was investigated in a subsequent study. However, to predict the shape's performance in a real application more accurately, the shape's characteristics in oblique waves must also be evaluated. In this study, the performance and characteristics of the model (hydrodynamic forces, body motions, wave elevations, and drift forces) are computed using a higher-order boundary element method (HOBEM). The HOBEM, which is based on the potential flow theory and uses quadratic representation for quadrilateral panels and velocity potentials, can be used to obtain more accurate results with fewer panels compared to the conventional panel method (CPM). The computational accuracy is confirmed by using Haskind-Newman and energy conservation relations. In this study, 3D wave effects were verified, and the body motions were much smaller compared to the 2D case. In addition, although the performance in terms of wave elevations depends on the measurement positions, the optimal performance obtained in the 2D case can be realized for a longer body length. Abstrak Evaluasi Performa Sebuah Pemecah Gelombang Terapung yang Telah Dioptimasi pada Gelombang DatangMiring dengan Metode Elemen Batas Orde Tinggi (HOBEM). Pada penelitian sebelumnya, sebuah bentuk model pemecah gelombang terapung dalam kasus 2D yang mempunyai performa optimal telah didapatkan. Performa dari bentuk ini dikonfirmasi dengan melakukan sebuah eksperimen model pada kolam uji. Selain itu, performa model tersebut telah pula diinvestigasi untuk kasus 3D pada penelitian berikutnya. Namun demikian, untuk dapat memprediksi performa model tersebut secara lebih akurat saat penerapannya di dunia nyata, maka menjadi sangat penting untuk mengevaluasi karakteristik dan performa model tersebut pada kasus gelombang datang miring. Pada penelitian ini, performa dan karakteristik dari model yang dimaksud berupa gaya hidrodinamika, olah gerak, elevasi gelombang dan gaya drift ditentukan dengan menggunakan metode elemen batas orde tinggi atau HOBEM. HOBEM yang dikembangkan berdasarkan teori potensial aliran dan menggunakan representasi kuadratik untuk panel kuadrilateral dan potensial kecepatan, dapat digunakan untuk memperoleh hasil yang lebih akurat dengan menggunakan jumlah panel yang lebih sedikit dibandingkan dengan metode panel konvensional. Keakuratan perhitungan dapat dikonfirmasi dengan menggunakan relasi Haskind-Newman and hukum konservasi energi. Dari penelitian ini, efek gelombang 3D dapat diverifikasi lebih lanjut dan olah gerak model ditunjukkan menjadi jauh lebih kecil dibandingkan pada kasus 2D. Selain itu, dapat pula disimpulkan dari hasil perhitungan bahwa meskipun performa model berupa elevasi gelombang akan tergantung dari posisi pengukuran, akan tetapi performa optimal yang telah didapatkan sebelumnya pa...

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On the Increase of the Resistance of a Ship in Rough Seas

Cited by 19 publications

References 0 publications

Numerical Analysis of Combined Wave Radiation and Diffraction on a Floating Barge

Numerical Analysis of Combined Wave Radiation and Diffraction on a Floating Barge

Hydrodynamic coefficients induced by waves and currents for submerged circular cylinder

Performance Evaluation of an Optimized Floating Breakwater in Oblique Waves with a Higher-Order Boundary Element Method

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