Numerical study of free surface flow in a 3-dimensional FLNG tank under coupled rotational-heave excitations

作者：Yan, Yan; Pfotenhauer, John M.; Miller, Franklin; Ni, Zhonghua^*

来源：Journal of Marine Science and Technology (Japan), 2018, 23(2): 333-348.

DOI：10.1007/s00773-017-0467-5

• Coupling excitations
• Volume of fluid method
• Free surface flow
• FLNG tank

In this paper, free surface flow in a full-sized 3D FLNG tank is numerically studied under coupled rotational-heave excitations. The numerical model uses the standard k-epsilon turbulence model and the volume of fluid method to describe fluid flow and track free surface. The emphasis of this study is making use of a full-sized tank with coupled excitations. A mesh independence study and comparison with other experiment and numerical simulation are implemented to verify the computational model. By parametrically investigating the influence of the initial phase difference, heave frequency and filling ratio, it is found that an initial phase difference of 0.5 pi and 1 pi can result in a higher local pressure near the tank corner and 0.5 pi will lead to a bigger amplitude of surface sloshing. A heave frequency of 2 times the natural frequency makes the surface sloshing flow most violent, but a heave frequency larger than that will turn the sloshing pattern into an up-and-down oscillation. A low filling ratio is more sensitive to both single rotational excitation and coupled excitations. However, a high filling ratio is relatively stable under rotation alone, but becomes much more violent from an induced heave excitation.

• 出版日期2018-6
• 单位东南大学