A Body-Nonlinear Green’s Function Method with Viscous Dissipation Effects for Large-Amplitude Roll of Floating Bodies

Guo, Zhiqun; Ma, Qingwei; Yu, Shuangrui; Qin, Hongde

doi:10.3390/app8040517

Cited by 3 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, Guo et al (2018a;2018b) incorporated the viscous dissipation effects into the free-surface equation and then developed a novel 2D time domain Green's function, which was proved to have better numerical stability in evaluating the interaction between waves and floating bodies with flare angles.…”

Section: The Computational Complexity and Numerical Stability Of The mentioning

confidence: 99%

“…Nonetheless, the SES to be studied in this paper is almost wall-sided and not subjected to the issue of numerical instability, so no special treatments are needed. If the 2.5D method would be used for floating bodies with flare angles, the developments in Guo et al (2018a;2018b) should be implemented.…”

Section: The Computational Complexity and Numerical Stability Of The mentioning

confidence: 99%

See 1 more Smart Citation

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

Guo

Qin

2018

Applied Ocean Research

Self Cite

View full text Add to dashboard Cite

When a surface effect ship (SES) sails in waves, the unsteady velocity potential of water can be decomposed into incident potential, sidehull radiation potential, sidehull diffraction potential and radiation potential due to fluctuating air pressure. The potentials related to sidehulls satisfy Neumann boundary conditions (BC) and have been successfully addressed using the 2.5D method. In contrast, the potential related to fluctuating air pressure satisfies mixed BC consisting of homogeneous Neumann BC on the wetted surface of sidehulls and nonhomogeneous Dirichlet BC on the interface between air and water, which has never been studied using the efficient 2.5D method. In this paper, the 2.5D method is firstly proposed to solve the mixed boundary value problem (BVP), which can deal with the coupling between the fluctuating air pressure and sidehulls. By using the 2.5D method, the radiation wave and other relative hydrodynamic parameters of a SES due to the fluctuating air pressure are evaluated. The numerical results on motion response and the fluctuated air pressure of the SES show acceptable agreement with the experimental ones.

show abstract

Section: The Computational Complexity and Numerical Stability Of The mentioning

confidence: 99%

Section: The Computational Complexity and Numerical Stability Of The mentioning

confidence: 99%

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

Guo

Qin

2018

Applied Ocean Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…The vessel's roll damping can be described as linear for vessels with small roll amplitudes [8] but linear models are insufficient for vessels with large roll amplitudes, therefore, nonlinearities need to be accounted for when the roll amplitude is large enough to capsize the vessel [9]. Nonlinearities are further important when considering the effect of bilge keels [10] or liquid cargo motion [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of Non-Linear Roll Damping of an FPSO Pure Roll Coupled with Liquid Sloshing in Two-Row Tanks

Igbadumhe

Sallam

Fürth

et al. 2020

JMSE

View full text Add to dashboard Cite

Wave excited roll motion poses danger for moored offshore vessels such as Floating Production Storage and Offloading (FPSO) because they cannot divert to avoid bad weather. Furthermore, slack cargo tanks are almost always present in FPSOs by design. These pose an increased risk of roll instability due to the presence of free surfaces. The most common method of determining roll damping is roll decay tests, yet very few test have been performed with liquid cargo, and most liquid cargo experiments use tanks that span the entire width of the vessel; which is seldom the case for full scale FPSO vessels during normal operations. This paper presents a series of roll decay test carried out on a FPSO model with two two-row-prismatic tanks with different filling levels. To directly investigate the coupling between the liquid sloshing and the vessel motion, without modifying the damping, tests were performed at a constant draft. The equivalent linear roll damping coefficients consisting of linear, quadratic and cubic damping terms are analyzed for each loading condition using four established methods, the Quasi-linear method, Froude Energy method, Averaging method and the Perturbation method. The results show that the cubic damping term is paramount for FPSOs and at low filling levels, were the FPSO is more damped. Recommendations regarding the applicability of the methods, their accuracy and computational effort is given and the effect of the liquid motion on the vessel motion is discussed.

show abstract

A numerical and experimental investigation of the effect of side walls on hydrodynamic model testing in a wave flume

et al. 2019

View full text Add to dashboard Cite

A Body-Nonlinear Green’s Function Method with Viscous Dissipation Effects for Large-Amplitude Roll of Floating Bodies

Cited by 3 publications

References 17 publications

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

Experimental Determination of Non-Linear Roll Damping of an FPSO Pure Roll Coupled with Liquid Sloshing in Two-Row Tanks

A numerical and experimental investigation of the effect of side walls on hydrodynamic model testing in a wave flume

Contact Info

Product

Resources

About