CN-115374559-B - Pipeline dynamic characteristic analysis method based on fluid-solid coupling effect equivalence

CN115374559BCN 115374559 BCN115374559 BCN 115374559BCN-115374559-B

Abstract

The invention provides a pipeline dynamic characteristic analysis method based on fluid-solid coupling effect equivalence, which belongs to the technical field of pipeline dynamic characteristic analysis and comprises the following steps of S1, determining geometric model parameters of an oil and gas pipeline to obtain first parameters, S2, determining static/dynamic parameters of a medium of the oil and gas pipeline to obtain second parameters, S3, determining mechanical parameters of an equivalent spring mass block to obtain third parameters, S4, constructing a spring equivalent model based on the first parameters, the first parameters and the third parameters, S5, constructing a finite element calculation model considering the fluid-solid coupling effect based on the spring equivalent model, S6, outputting equivalent spring-oil and gas pipeline dynamic characteristics containing the medium coupling effect based on the finite element calculation model to obtain calculation results, and S7, designing and optimizing an oil and gas pipeline gathering and transportation scheme based on the calculation results. The invention aims to solve the technical problems of large calculation time, complex structure and high error rate, which cause great increase of workload in the prior art.

Inventors

WENG GUANGYUAN
XU CHENXI
LAN GUANQI
WANG LE
ZHU XIYU
ZHANG YUMIN

Assignees

西安石油大学
西安石油大学

Dates

Publication Date: 20260421
Application Date: 20220817
Priority Date: 20220817

Claims (5)

1. The pipeline dynamic characteristic analysis method based on the fluid-solid coupling effect equivalence is characterized by comprising the following steps of: s1, determining geometric model parameters of an oil and gas transmission pipeline to obtain first parameters; s2, determining static/dynamic parameters of the medium of the oil and gas pipeline to obtain second parameters; s3, determining the mechanical parameters of the equivalent spring mass block to obtain third parameters; S4, constructing a spring equivalent model based on the first parameter, the first parameter and the third parameter; S5, establishing a finite element calculation model considering the fluid-solid coupling effect based on a spring equivalent model; S6, outputting equivalent spring-oil and gas pipeline dynamic characteristics containing a medium coupling effect based on the finite element calculation model to obtain a calculation result; s7, designing and optimizing an oil and gas transmission pipeline gathering and transmission scheme based on the calculation result; in step S1, the first parameter includes a pipe caliber, a pipe material, a pipe span, and a pipe constraint; In step S2, the second parameter includes a media mass, a media viscoelastic coefficient, a media flow rate, and a media fullness; In step S3, the third parameters include spring mass, spring rate, and number and distribution of springs and masses; In step S3, calculating the mechanical parameters of the equivalent spring mass block based on a spring fairing method, and then obtaining third parameters; In step S3, the spring fairing method includes the steps of: And obtaining the position of each node after fairing by calculating a force balance equation among the spring nodes, wherein the force balance equation is as follows: formula (1) Wherein: the displacements of the spring node i and the spring node j are respectively; The number of the nodes connected with the spring node i; is the elastic coefficient between the spring node i and the spring node j; The spring rate is defined as: Wherein: spring Constant Factor, an input value; When the spring force reaches equilibrium, it can be calculated that: Wherein: m is the iteration number; After the displacement calculation of the spring node i is obtained, the grid position is updated: Formula (4); then, the spring elastic coefficient, the number and distribution of springs and mass blocks are obtained, and finally, the mass block mass is obtained based on the medium mass and the mass block number; In step S4, the spring equivalent model includes: A pipeline equivalent module (100); The spring equivalent modules (200) are provided with a plurality of groups, the plurality of groups of spring equivalent modules (200) are equidistantly arranged on the inner wall of the pipeline equivalent module (100), each group of spring equivalent modules (200) is provided with a plurality of spring equivalent modules, and the plurality of spring equivalent modules (200) are uniformly distributed in a ring shape; the number of the mass block equivalent modules (300) is matched with that of the spring equivalent modules (200), and each mass block equivalent module (300) is respectively arranged at the end part of the spring equivalent module (200) away from the pipeline equivalent module (100); the spring equivalent module (200) is equivalent to 'damping between a medium and a pipeline'; the mass equivalent module (300) is equivalent to a "media mass".
2. The method for analyzing pipeline dynamic characteristics based on fluid-solid coupling effect equivalence according to claim 1, wherein in step S5, the finite element calculation model adopts A model, wherein, The model adopts a fluid flow equation, wherein the fluid flow equation is as follows: formula (5) Formula (6) Wherein: is turbulent kinetic energy; dissipation ratio of turbulent kinetic energy of fluid; is a turbulent viscosity coefficient; And Is the turbulent plantty number; Generating a term for turbulence energy caused by the average velocity gradient; Is a turbulent energy term generated for buoyancy; is the effect of compressible turbulence pulsations; , , 、 And Is a constant; And Is a source item.
3. The method of claim 2, wherein the fluid flow equation is obtained based on a continuous equation and a momentum equation, and wherein: the continuous equation is: Formula (7) Wherein: time is; Is the fluid density; is the fluid velocity component in each direction; The momentum equation is: Formula (8) Wherein: is a viscous shear force tensor; Is the volumetric force vector.
4. A method of analyzing pipeline dynamics based on fluid-solid coupling effect equivalence according to claim 3, wherein the fluid flow equation follows conservation principle on the fluid-solid coupling surface, and satisfies the following conditions: Formula (9) Formula (10) Wherein: Is the shear force vector of the fluid; Node number for fluid; shear force vector as solid; node number being solid; Is the displacement of the fluid; A solid position; Obtaining a vibration equation of the overall structure based on the formula (5) -the formula (10), wherein the vibration equation is as follows: Formula (11) Wherein: A quality matrix for considering the fluid-solid coupling effect; A damping matrix for considering the fluid-solid coupling effect; To take into account the coefficient of elasticity matrix of the fluid-solid coupling effect.
5. The method for analyzing pipeline dynamic characteristics based on fluid-solid coupling effect equivalence according to claim 4, wherein in step S6, it comprises the steps of: S61, outputting displacement response, acceleration response and dynamic stress response of the equivalent spring containing the medium based on the finite element calculation model; s62, outputting a natural frequency, a vibration mode diagram and damping containing a medium equivalent spring based on the finite element calculation model.

Description

Pipeline dynamic characteristic analysis method based on fluid-solid coupling effect equivalence Technical Field The invention belongs to the technical field of pipeline dynamic characteristic analysis, and particularly relates to a pipeline dynamic characteristic analysis method based on fluid-solid coupling effect equivalence. Background The fluid-solid coupling effect is displacement, speed, acceleration and the like generated by the action of fluid on the surface or in the solid, is a science for researching the interaction of various behaviors of deformed solid under the action of a flow field and the influence of solid position on the flow field, and is characterized in that the interaction between two phase media is an important characteristic of the fluid-solid coupling effect, the deformed solid can deform or move under the action of fluid load, the deformation or move in turn influences the movement of the fluid, so that the distribution and the size of the fluid load are changed, and the interaction can generate various fluid-solid coupling phenomena under different conditions. Chinese patent application No. CN201910001794.6 discloses a method and a device for predicting resonance response characteristics of three-dimensional fluid-solid coupling parameters of an aviation pipeline. The method for predicting the resonance response characteristics of the three-dimensional fluid-solid coupling parameters of the aviation pipeline establishes a three-dimensional fluid-solid coupling dynamics model of the aviation pipeline according to related parameters, establishes a three-dimensional fluid-solid coupling dynamics motion equation of the aviation pipeline according to the dynamics model, obtains a finite-dimension matrix equation according to the dynamics motion equation, and obtains the resonance response characteristics of the parameters of the aviation pipeline within a preset pulsation frequency range according to the finite-dimension matrix equation. In the process of acquiring the parameter resonance response characteristic, the method can effectively avoid a resonance interval and prevent the occurrence of parameter resonance, and then the service life and the safety of the aviation flow transmission pipeline are improved. However, the above patent uses a fluid field and a solid field to perform calculation in a system coupling manner, and the calculation time is relatively large, the structure is complex, the error rate is high, and the workload is greatly increased. Disclosure of Invention The invention aims to provide a pipeline dynamic characteristic analysis method based on fluid-solid coupling effect equivalence, and aims to solve the technical problems of large calculation time, complex structure and high error rate, which cause great increase of workload in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: A pipeline dynamic characteristic analysis method based on fluid-solid coupling effect equivalence comprises the following steps: s1, determining geometric model parameters of an oil and gas transmission pipeline to obtain first parameters; s2, determining static/dynamic parameters of the medium of the oil and gas pipeline to obtain second parameters; s3, determining the mechanical parameters of the equivalent spring mass block to obtain third parameters; S4, constructing a spring equivalent model based on the first parameter, the first parameter and the third parameter; S5, establishing a finite element calculation model considering the fluid-solid coupling effect based on a spring equivalent model; S6, outputting equivalent spring-oil and gas pipeline dynamic characteristics containing a medium coupling effect based on the finite element calculation model to obtain a calculation result; And S7, designing and optimizing an oil and gas transmission pipeline gathering and transmission scheme based on the calculation result. The invention aims to solve the technical problems of large calculation time, complex structure and high error rate, which cause great increase of workload in the prior art. As a preferable aspect of the present invention, in step S1, the first parameter includes a pipe caliber, a pipe material, a pipe span, and a pipe constraint; In step S2, the second parameter includes a media mass, a media viscoelastic coefficient, a media flow rate, and a media fullness; In step S3, the third parameters include spring mass, spring rate, and number and distribution of springs and masses. As a preferred solution of the present invention, in step S3, the mechanical parameters of the equivalent spring mass are calculated based on the spring fairing method, and then the third parameters are obtained. As a preferred embodiment of the present invention, in step S3, the spring fairing method includes the steps of: And obtaining the position of each node after fairing by calculating a force balance equation among the