Numerical Simulation Of The Free Fall Of Gravity Installed Anchor In Water

Oil and gas are strategic significance to ensure the supply of energy and the sustainable economic development in China. Mooring system as an important component of the offshore oil and gas drilling platforms plays a pivotal role in guaranteeing the safe operation of the offshore platform. Among many types of mooring foundations, the Gravity Installed Anchor can automatically complete the installation by gravity and is convenient to handle, which also has high uplift bearing capacity. So, it becomes a recent type of mooring technology and a more suitable mooring system for deep-water oil and gas picking. Since the concept of Gravity Installed Anchor has been proposed, the researches on the Gravity Installed Anchor's free fall in the water are paid little attention. So, this research has important theoretical significance and application value.This paper studies the numerical simulation of the free fall of the Gravity Installed Anchor by using the FLUENT software to provide a theoretical basis for the design and installation of deep-water mooring foundation. The main research subjects are given as follows: (1) Firstly, the theoretical basis of the computational fluid dynamics in the FLUENT software, such as the continuity equation, momentum equation, boundary layer theory, dynamic mesh model, etc., and the motion differential equation is derived and the simulation models are determined. The models and method in this thesis are demonstrated by simulation results of the numerical simulation of the sphere's free-fall in water. (2) In the same geometry model, the models for the numerical simulation of the installation of the torpedo anchor in water with different grid scales are established, in order to analysis the influence of the mesh subdivision in viscous fluid, the variations of the drag coefficient with Reynolds number, and the value of the drag coefficient in the steady acceleration period. The simulation result is compared with data in published experiment and literature consequence. (3) The models for the numerical simulation of the installation of the Gravity Installed Plate Anchors with different shape in water are established. The focus about the research is mainly the effect of the loading arm on impact velocity, displacement, angle, stability and drag coefficient.