Method and system for monitoring vibration frequency of submarine pipeline based on CFD simulation

Abstract

The invention provides a method and system for monitoring the vibration frequency of a submarine pipeline based on CFD simulation. The method comprises the following steps: establishing a simulation task in CFD simulation software; setting a physical model required by the simulation task and physical parameters of the physical model; establishing a two-dimensional scouring model of the submarine pipeline, performing grid division on a computational domain of the two-dimensional scouring model, and setting initial conditions and boundary conditions of the computational domain; arranging monitoring points on the model of the submarine pipeline, collecting fluid force borne by the monitoring points to obtain a fluid force time history change curve of the submarine pipeline, and conducting fast Fourier transform on the curve; determining a calculation method for solving a numerical value, and setting a calculation time step length; operating simulation calculation, and outputting a vibration frequency change curve of the pipeline and flow field information around the pipeline in a text and image mode. According to the method, the flow field distribution around the pipeline and the vibration frequency of the pipeline can be calculated at the same time, vortex-induced resonance of the pipeline is effectively avoided, and the safety of the submarine pipeline is improved.

Description

technical field [0001] The present application relates to the technical field of marine engineering, in particular to a method and system for monitoring the vibration frequency of a submarine pipeline based on CFD simulation. Background technique [0002] At present, people pay more and more attention to offshore oil and gas resources, and submarine pipelines play an increasingly important role in the transportation of oil and gas resources. Among them, submarine pipelines are often trenched and buried when they are first laid. However, due to the complex environment of the seabed, the pipeline may be exposed to the seabed under the long-term erosion of waves and currents. Once the pipeline is exposed, the scour process around the pipeline will be accelerated, and the sediment under the pipeline will be continuously transported away, causing the pipeline to be suspended. When the suspended section of the pipeline reaches a certain length, under certain conditions, alternate...

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Problems solved by technology

However, the applicant found that the method of calculating the vibration frequency of the pipeline by the above-mentioned finite element software cannot obtain the flow field information around the pipeline, and it is difficult to analyze the vibration frequency for the full flow field, so it cannot accurately and timely avoid vortex induced resonance damage to the pipeline

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