Performance Analysis Of Fluid-structure Interaction Of Curved Pipe Based On Workbench

As the pipeline system is widely used in many fields of life and production,the pipeline bend is being paid more and more attention as an important part of the pipeline system.Therefore,a comprehensive understanding of the coupling vibration characteristics of the pipeline system is important for pipeline systems.The design and use has significant practical application value.This paper uses ANSYS Workbench software to study the coupled vibration characteristics of the elbow pipe.The main work is as follows:(1)The FSI equation model of the coupling between the pipe system and the fluid is established.The FSI equation model consists of the axial expansion 4 equation,the lateral bending xz plane 4 equation,the lateral bending yz plane 4 equation,and the pipeline.The torsion 2equation is composed of three directions: axial motion,lateral motion,and torsional motion to describe the motion state of the pipeline in the coupling process.(2)The ANSYS Workbench software is used to simulate thefluid-solid coupling flow field and stress-strain of the elbow.The finite element model of the bending pipe with different bending radii is established,and the influence of the bending radius on the coupled vibration characteristics of the bending pipe is discussed from the perspectives of fluid flow velocity,wall pressure,total deformation,strain and stress.Analysis of the fluid flow velocity trace graph shows that with the increase of the bending radius of the pipeline,the fluid flow velocity in the elbow increases significantly,and the inside velocity at the elbow is the largest,and the outside velocity is the smallest;the smaller the bending radius,the smaller the fluid velocity.The greater the inhibitory effect.The analysis of the pipe wall pressure cloud diagram shows that with the increase of the bending radius of the pipe,the pressure on the inner wall of the pipe decreases,the inner pressure at the elbow is the smallest,and the outer pressure is the largest;the bend radius of the elbow affects the stress distribution in the pipe.;The pipe bending radius has a significant effect on controlling the fluid flow rate and the pressure on the inner wall of the pipe.Analysis of the total deformation and stress and strain of the pipeline shows that the pressure at the inlet of the pipeline has a significant effect on the total deformation of the pipeline.As the bendingradius of the curved pipeline increases,the maximum principal stress and maximum principal strain first decrease and then increase,and the minimum principal stress and minimum principal Strain first rises then falls.(3)Use ANSYS Workbench software to perform vibration modal analysis on elbows,establish finite element models of empty and liquid-filled elbows,and obtain natural frequency and mode shapes of empty and liquid-filled pipes through modal analysis.Comparing the natural frequency of an empty pipe with a liquid-filled pipe,it is found that the natural frequency of the liquid-filled pipe is greater than the natural frequency of the empty pipe.The increased bending stiffness results in an increase in the natural frequency.The analysis of the mode shape diagram and the natural frequency of the empty pipe shows that with the increase of the bending radius,the natural frequency of the bent pipe increases significantly and tends to be stable when the bending radius is large.