Submarine pipeline in-situ stability engineering evaluation method based on Reynolds number effect

Abstract

The invention discloses a submarine pipeline in-situ stability engineering evaluation method based on a Reynolds number effect, and the method comprises the steps: collecting the characteristic coefficient L / G and 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 lengthof 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 the gap 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 of thesubmarine pipeline; and according to the obtained pipeline characteristic coefficient L / G, the Reynolds number Re and the bottom end coefficient omega, calculating the drag force coefficient CD of thesmall-suspended-span submarine 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 an engineering evaluation method for in-situ stability of submarine pipelines based on the Reynolds number effect. Background technique [0002] Offshore oil and gas pipelines, as umbilical lines 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 a key and difficult point. The submarine spanning pipeline is its common form. Submarine spanning pipelines under the action of ocean currents are often simplified as figure 1 In 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 hy...

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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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