Submarine pipeline lift coefficient evaluation method based on small-gap influence factors
A lift coefficient and influencing factor technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as being too conservative, and achieve the effect of overcoming the difficulty of hydrodynamic coefficient
Pending Publication Date: 2020-08-14
DALIAN UNIV OF TECH
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Problems solved by technology
The existing engineering codes and related designs have the following problems: 1. Too conservative; 2. The influence of the complex flow field on the drag force and lift force has been ignored.
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[0060] The suspension span length of the collected submarine pipeline is L=10m, the diameter of the submarine pipeline is D=2.3m, the gap ratio is G=3m, the simulation environment is 100m below the sea level, the seawater pressure is 10atm, and the density is 1025kg / m 3 , the hydrodynamic viscosity is 0.01674N-s / m 2 , ocean current velocity is U=0.03m / s, Reynolds number Re is 3.01*10 5 . Re=UD / ν, where ν is the viscosity coefficient (constant) of water.
[0061] S1: Calculate the near-wall flow velocity u of the submarine pipeline under specific working conditions;
[0062] S11: Determine the physical model and calculation domain of the submarine pipeline: according to the actual size of the submarine pipeline and the gap distance G between the submarine pipeline and the seabed surface, use GMSH to draw its physical model, such as figure 2 shown, and determine the computational domain.
[0063] S12: Mesh division and boundary condition setting of the hull submarine pipeli...
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The invention discloses a submarine pipeline lift coefficient evaluation method based on small-gap influence factors, and the method comprises the steps: collecting the characteristic coefficient L / Gand Reynolds number Re information of a submarine pipeline, and calculating the near-wall flow velocity u of the submarine pipeline under a specific working condition, where L is the length of the pipeline, and G is the gap distance; determining a physical model and a computational domain of the subsea pipeline: drawing the physical model according to the actual size of the subsea pipeline and thegap distance G between the subsea pipeline and the subsea surface, and determining the computational domain; calculating a submarine pipeline bottom end coefficient omega according to the physical model and the computational domain of the suspended span section of the submarine pipeline; calculating a local pressure coefficient CP and a local wall surface friction coefficient Cf borne by the submarine pipeline; and according to the obtained pipeline characteristic coefficient L / G, Reynolds number Re and bottom end coefficient omega, calculating the lift coefficient CL of the small-suspended-span subsea pipeline by adopting a vector integral multi-factor comprehensive evaluation engineering method.
Description
technical field [0001] The invention relates to the technical field of submarine pipeline analysis, in particular to a method for evaluating the lift coefficient of a submarine pipeline based on small gap influence factors. Background technique [0002] Offshore oil and gas pipelines, as the umbilical cords connecting offshore oil and gas platforms and land installations, have very important engineering research significance. The in-situ stability research and engineering application of offshore oil and gas pipelines have always been the focus and difficulty. The submarine spanning pipeline is its common form. Submarine spanning pipelines under the action of ocean currents are often simplified as figure 1 The schematic diagram of the rigid suspension pipeline, the control parameters include pipe diameter D, pipe length L, gap ratio G, and incoming flow field information Re. [0003] However, in the current ocean engineering, it is urgent to quickly calculate the hydrodynam...
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IPC IPC(8): G06F30/20G06F113/14G06F119/14
CPCG06F30/20G06F2113/14G06F2119/14Y02T90/00
Inventor 杨帆吕林刘俊许条建
Owner DALIAN UNIV OF TECH