Hydrodynamic Analysis Of Very Large Floating Oil Storage Vessels With Mooring System

Recently, along with the speed of industrialization of china constantly quickened, and an increasingly stronger demand for crude oil, it is an urgent task to establish a complete petroleum reserve. Strategic petroleum reserve includes mainly five storage forms, such as, tanks above ground, tanks under ground, rock caves under ground, underground salt cave floating tankers and so on. Comprehensive above several ways,and considering the population density, geographic environment and industrial distribution, this paper adopt mainly the oil storage way which is based on offshore petroleum reserve combined with other ways.According to conceptual design for strategic oil storage vesse, the paper analyzed respectively hydrodynamics and motion of oil storage vessel, mooring system and breakwater. First, based on3D potential flow theory and high-order boundary element method, the first-order hydrodynamics of the oil storage vessel are computed in frequency domain, and the heave motion performance is especially analyzed by using viscous damping linearization method. Second, in time domain coupled simulation, a very large floating mooring oil storage vessel model is established. After investigation, a mooring system of dolphin type with rubber fenders is developed. The hydrodynamic response is analyzed under the influence of wind, wave and current, and the computation results are compared with floating’s. Then, the numerically generated and absorbed wave is carried out in2D numerical flume by the means of piston-type wave and sponge layer absorbing wave, then the floating breakwater is placed in the middle of working zone, and the wave decay characteristics is studied with a fixed hypothesis. Futhermore, the hydrodynamics and motion of oil storage are analyzed with protection of the outer breakwater. At last. Using the full coupled model of flow and flow-inclued body, dynamic characteristics of the floating breakwater between the trapezoid and23order single step method were compared. An new technique of dynamic mesh with full freedom multiply structured grids was applied to numerical simulation. Futhermore. the hydrodynamics and motion of oil storage are analyzed with the breakwater moving.