Research On Flow-induced Vibration Characteristics Of Pipeline Under Tidal Basin

The fluid conveying pipes are widely applied to spaceflight,nuclear energy,petroleum,and marine engineering because of its thin light and mature technology.Furthermore,its small stiffness and complex flow in cross and internal flow,it will be caused great difficulties to transport the energy transfer between fluid and medium.So this article in view of the flow Stype pipelines vibration problem that transport two phase fluids in the ocean basin,and study multiphysics coupling by considering the problems in many aspects,including bidirectional tidal flow cycle characteristics,in-tube two-phase fluid dynamic interface and conveying pipeline solid structure mechanical properties,to explore the relationship between fluid flow parameters and instability of the pipelines in different river basins.This article mainly analyzes the vibration response characteristics of S-type pipelines from three aspects.(1)Firstly,the pipeline vibration induced by gas-liquid two-phase flow in inner basin was calculated and analyzed.Based on 2D and 3D pipeline models,according to combining with longitudinal analysis of flow characteristics to induce pipe vibration and transverse analysis of vibration characteristics of pipelines under different flow parameters,to calculate the timedisplacement curve,wall stress distribution and the pipe deformation characteristics.It can be inferred that the time-displacement of the riser area is higher than the curved pipe area above the fixed end;Full-period time-displacement and wall stress show an inverse relationship;(2)Research for the vibration of tidal flow induced pipeline.Based on the physical model of three-dimensional rectangular drainage basin and pipeline,the fluid-solid coupling of pipelines under the action of parallel basin and verticality basin.According to the calculation results,the stress field of the pipeline can be expressed as the area of the solid support end is higher than the area of the riser pipe section above the area of the bent pipe,the full-period pipeline displacement shows periodic fluctuations consistent with the height of the outer basin.(3)A two-degree-of-freedom multiphysics coupling analysis was performed for the vibration characteristics of the pipeline under the coupled watershed.The S-type pipeline for transporting two-phase fluids in the Parallel watershed under the excitation of the superposition and attenuation of the force in the inner and outer basins mainly exhibits the contraction deformation vibration and the expansion deformation vibration.In the verticality watershed,there is a phenomenon of deformed distortion of continuous homoclinic chatter.