CN111539120A - Submarine pipeline lift coefficient evaluation method based on small-gap influence factors - Google Patents
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Abstract
The invention discloses a submarine pipeline lift coefficient evaluation method based on small gap influence factors, which comprises the following steps: acquiring the characteristic coefficient L/G and Reynolds number Re information of the submarine pipeline, and calculating the near-wall flow velocity u of the submarine pipeline under a specific working condition, wherein L is the pipeline length, and G is the gap distance; determining a physical model and a computational domain of the subsea pipeline: drawing a physical model of the submarine pipeline according to the actual size of the submarine pipeline and the gap distance G between the submarine pipeline and the sea bottom surface, and determining a calculation domain; calculating a submarine pipeline bottom coefficient omega according to a physical model and a calculation domain of a submarine pipeline suspended span section; calculating local pressure coefficient C borne by submarine pipelinePAnd local wall friction coefficient Cf(ii) a Adopting a vector integral multi-factor comprehensive evaluation engineering method according to the obtained pipeline characteristic coefficient L/G, Reynolds number Re and bottom coefficient omegaMethod for calculating lift coefficient C of small suspended span submarine pipelineL。
Description
Technical Field
The invention relates to the technical field of submarine pipeline analysis, in particular to a submarine pipeline lift coefficient evaluation method based on small-gap influence factors.
Background
The marine oil and gas pipeline is used as an umbilical line for connecting an offshore oil and gas platform and land, has important engineering research significance, and is always important and difficult in-place stability research and engineering application. Subsea suspended span pipelines are a common form thereof. The submarine suspended span pipeline under the action of ocean current is often simplified into a rigid suspended span pipeline diagram as shown in fig. 1, and the control parameters include pipe diameter D, pipe length L, clearance ratio G and inflow flow field information Re.
However, in current ocean engineering, it is urgently needed to quickly calculate hydrodynamic force of a submarine suspended span pipeline and determine a drag force coefficient C of the suspended span pipeline under a specific ocean current conditionDAnd coefficient of lift CL. The drag force is a force acting in the x direction in fig. 1, and the pull force is a force acting in the y direction in fig. 1. Drag coefficient CDAnd coefficient of lift CLThe stability of the pipeline suspended from the sea bottom in place is greatly influenced, and the design of the pipeline is influenced. The existing engineering specification and related design have the following problems: 1. and 2, the influence of a complex flow field on the dragging force and the lifting force is neglected.
Disclosure of Invention
According to the problems in the prior art, the invention discloses a submarine pipeline lift coefficient evaluation method based on small clearance influence factors, which specifically comprises the following steps:
acquiring the characteristic coefficient L/G and Reynolds number Re information of the submarine pipeline, and calculating the near-wall flow velocity u of the submarine pipeline under a specific working condition, wherein L is the pipeline length, and G is the gap distance;
determining a physical model and a computational domain of the subsea pipeline: drawing a physical model of the submarine pipeline according to the actual size of the submarine pipeline and the gap distance G between the submarine pipeline and the sea bottom surface, and determining a calculation domain;
calculating a submarine pipeline bottom coefficient omega according to a physical model and a calculation domain of a submarine pipeline suspended span section;
calculating local pressure coefficient C borne by submarine pipelinePAnd local wall friction coefficient Cf；
Calculating the lift coefficient C of the submarine pipeline based on the small clearance influence factor by adopting an engineering method based on actual measurement multi-modal strain response according to the acquired pipeline characteristic coefficient L/G, Reynolds number Re and bottom coefficient omegaL。
Further, the near-wall flow velocity u of the marine submarine pipeline under a specific working condition is calculated, underwater actual environment parameters are set in simulation software, and the near-wall flow velocity u generated by the marine submarine pipeline under the working condition of different speeds, namely the Reynolds number Re, is calculated in a large vortex simulation mode.
Further, the subsea pipeline bottom coefficient Ω is obtained as follows:
dividing the mesh of the submarine pipeline suspended span section and setting the boundary conditions of the mesh: wherein, the calculation domain of the suspended span section adopts mixed grid division, and the wall surface domain of the suspended span section adopts unstructured grid; the other areas adopt structured grids, the other areas are set as static areas, the inlets of the other areas are set as speed inlet conditions, and the outlets of the other areas are set as pressure outlet conditions;
and (3) taking the near-wall surface flow velocity u as the inlet velocity of the submarine pipeline suspended span section in simulation software, and calculating the discrete value of the submarine pipeline bottom coefficient omega corresponding to the pipeline winding flow velocity u by adopting a large vortex simulation mode.
Further, when acquiring a physical model of the subsea pipeline: the areas adjacent to the wall surfaces 1/5-2/5 of the submarine pipelines in the calculation domain adopt unstructured grids in the calculation domain radius, and other areas adopt structured grids; the inlet of the calculation domain is set as a speed inlet condition, the pipeline and the seabed bottom surface are set as a fixed wall surface, and the outlet of the calculation domain is set as a pressure outlet condition.
Further, the local pressure coefficient CPAnd local wall friction coefficient CfThe following method is adopted for obtaining: an included angle between the ocean current and the vertical direction of the submarine pipeline is set as theta, clockwise is positive, and anticlockwise is negative,then the ocean current velocities far away from the surface of the sea bed along the ocean current direction and the direction vertical to the submarine pipeline are ucos theta and usin theta respectively; calculating and obtaining a local pressure coefficient C through a pressure coefficient algorithm and a wall surface friction coefficient algorithmPAnd local wall friction coefficient Cf。
Further, a lift coefficient C is calculatedLThe method comprises the following steps: respectively calculating lift coefficient C based on different Reynolds numbers Re within various set threshold ranges of the small-span submarine pipelineL；
When L/G < 2.5:
when 6.5> L/G > 2.5:
when L/G > 6.5:
wherein: cLIs coefficient of lift, Cp-yIs a y-direction pressure coefficient component, Cf-yIs the y-direction wall friction coefficient component; the coefficient omega of the bottom end of the submarine pipeline, A is the equivalent cross section area, rho is the water density and D is the pipeline radius.
Compared with the prior art, the method rotates the wall surface according to the real variable lift coefficient, and avoids the synchronous positive and negative pressure peak values on the two sides of the vertical pipe by changing the wake vortex flow field structure and pressure distribution, thereby reducing the lift amplitude to 50%. Due to the adoption of the technical scheme, the friction stability analysis method based on the small suspended span submarine pipeline provided by the invention adopts simulation software to analyze the hydrodynamic force of the suspended span submarine pipeline and is based on various mature numerical calculation models, so that the hydrodynamic force change of the suspended span pipeline can be effectively predicted, and the hydrodynamic force coefficient of the suspended span submarine pipeline on the seabed can be accurately calculated through a grid independence verification technology and a grid self-adaptive technology. The existing method for obtaining the hydrodynamic force of the suspended span pipeline through an open water experiment is carried out in an indoor water pool, and the influence of factors such as the actual seawater density, the pressure, the ocean current and the like in deep sea cannot be considered. In addition, the method does not need deep sea actual measurement data, so that the method disclosed by the invention overcomes the difficulty in obtaining the hydrodynamic coefficient of the suspended span pipeline by adopting a parameter identification method.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a rigid suspended span pipeline according to the background art of the present invention;
FIG. 2 is a schematic diagram of a physical model and a computational domain of a small suspended span subsea pipeline according to the present invention;
FIG. 3 is a diagram of the present invention showing the local friction coefficient C of the pipeline wall surface calculated by simulation softwaref；
FIG. 4 is a diagram of the local pipeline pressure coefficient C calculated by simulation software according to the present inventionP；
FIG. 5 is a schematic diagram of a physical model of a suspended span of a subsea pipeline according to the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the drawings in the embodiments of the present invention:
the invention discloses a submarine pipeline lift coefficient evaluation method based on small gap influence factors, which specifically comprises the following steps:
as shown in fig. 2: s1, acquiring the suspended span length L and the Reynolds number Re of the submarine pipeline, and calculating the near-wall flow velocity u of the submarine pipeline under a specific working condition, wherein the method specifically comprises the following details: collecting and collecting the length L of a submarine pipeline and a Reynolds number Re, wherein Re is UD/v, and v is a viscosity coefficient (constant) of water.
S2: determining a physical model and a computational domain of the subsea pipeline: and drawing a physical model of the submarine pipeline according to the actual size of the submarine pipeline and the gap distance G between the submarine pipeline and the sea bottom surface, and determining a calculation domain.
S21: the grid division and boundary condition setting process of the submarine pipeline computing domain comprises the following steps: the non-structured grids are adopted in the areas of the calculation domain radiuses close to the pipeline wall surfaces 1/5-2/5 in the calculation domain, and the structured grids are adopted in other areas; setting the inlet of a calculation domain as a speed inlet condition, and setting the pipeline and the seabed bottom surface as a fixed wall surface; calculating a domain outlet setting as a pressure outlet condition;
s22: and (3) calculating the near-wall flow velocity u of the submarine pipeline under a specific working condition, namely setting underwater actual environment parameters in simulation software, and calculating the near-wall flow velocity u generated by the near-wall surface of the submarine pipeline under the working conditions of different velocities (namely Reynolds numbers Re) of ocean currents in a large vortex simulation mode.
And S3, calculating the bottom coefficient omega of the submarine pipeline according to the physical model and the calculation domain of the submarine pipeline suspended span section.
S31, determining a physical model and a calculation domain of the submarine pipeline suspended span section: the model sketch is shown in FIG. 3, a physical model of the suspended span section is drawn according to the actual size of the suspended span section and the gap distance G between the submarine pipeline and the sea bottom surface, and a calculation domain is determined;
s32, setting the gridding and boundary conditions for the span segment as follows: the suspended span section calculation domain is divided by adopting a mixed grid, and the suspended span section wall surface domain adopts an unstructured grid; other areas adopt structured grids, and the other areas are set as static areas; setting the other zone inlets to a velocity inlet condition and the other zone outlets to a pressure outlet condition;
s33, considering the influence of the streaming velocity on the bottom coefficient omega of the submarine pipeline, calculating the near-wall surface velocity u in the simulation software as the inlet velocity of the submarine pipeline suspended span section, and calculating the discrete value of the bottom coefficient omega of the submarine pipeline corresponding to the streaming velocity u of the pipeline by adopting a large vortex simulation mode.
S4: calculating local pressure coefficient C borne by submarine pipelinePAnd local wall friction coefficient Cf: assuming that the included angle between ocean current and the vertical direction of the submarine pipeline is theta, clockwise is positive, and anticlockwise is negative, the ocean current speeds far away from the surface of the sea bed along the ocean current direction and the direction vertical to the submarine pipeline are ucos theta and usin theta respectively; the local pressure coefficient C can be calculated by a pressure coefficient algorithm and a wall surface friction coefficient algorithmPAnd local wall friction coefficient Cf。
S5: calculating the lift coefficient C of the submarine pipeline based on the small-gap influence factors by adopting an actual measurement based multi-mode strain response engineering method according to the acquired pipe length L, the Reynolds number Re, the gap distance G and the submarine pipeline bottom coefficient omegaL。
The method comprises the following steps of carrying out detailed table division on various set threshold ranges of the small suspended span submarine pipeline, taking values based on different Reynolds numbers Re, and adopting different calculation modes, wherein the specific table is shown in table 1:
TABLE 1
The reference formula is then:
when L/G < 2.5: namely C1:
when 6.5>L/G>2.5, B1:
B2：
when L/G >6.5
A1
A2
Wherein: cLIs coefficient of lift, Cp-yIs a y-direction pressure coefficient component, Cf-yIs the y-wall friction coefficient component; the coefficient omega of the bottom end of the submarine pipeline, A is the equivalent cross section area, rho is the water density and D is the pipeline radius. L pipeline span length, Re Reynolds number, Re uD/v where v is the viscosity coefficient of water (constant)
Example (b):
collecting the suspended span length L of the submarine pipeline to be 10m, the diameter D of the submarine pipeline to be 2.3m, the gap ratio G to be 3m, adopting a simulation environment to be 100m under the sea level, the seawater pressure to be 10atm and the density to be 1025kg/m3The hydrodynamic viscosity is 0.01674N-s/m2The ocean current velocity is 0.03m/s, and the Reynolds number Re is 3.01 x 105. Re ═ UD/v, where v is the viscosity coefficient of water (constant).
S1, calculating the near-wall flow velocity u of the submarine pipeline under a specific working condition;
determining a physical model and a computational domain of the subsea pipeline S11: according to the actual size of the submarine pipeline and the gap distance G between the submarine pipeline and the sea bottom surface, a GMSH is adopted to draw a physical model of the submarine pipeline, as shown in figure 2, and a calculation domain is determined.
And S12, meshing and boundary condition setting of the ship body submarine pipeline: through the verification of the independence of the grids, the unstructured grids are finally determined to be adopted in the area, close to the wall surface of the submarine pipeline by 100mm, in the submarine pipeline calculation domain, the size of each grid is 2, structured grids are adopted in other areas, and the size of each grid is 2.2. The inlet was set to a velocity inlet condition, the pipeline surface was set to a solid wall surface, and the outlet was a pressure outlet condition.
S13, setting underwater actual environment parameters in FLUENT, calculating the near-wall flow speed u of the submarine pipeline under specific working conditions, and calculating the local pressure coefficient C borne by the submarine pipelineP(as shown in FIG. 4) and the local wall friction coefficient Cf(as shown in fig. 3).
S2, calculating the bottom coefficient omega of the submarine pipeline;
and S21, determining a physical model and a calculation domain of the submarine pipeline span section, drawing a physical structure of the submarine pipeline span section by SolidWorks according to the actual size of the submarine pipeline span section, and introducing the submarine pipeline span section into a GMSH (Gaussian minimum shift keying) division grid. The suspended span section calculation domain is divided by adopting mixed grids, and the suspended span section wall surface domain adopts unstructured grids; other areas adopt structured grids, and the other areas are set as static areas; setting the other zone inlets to a velocity inlet condition and the other zone outlets to a pressure outlet condition;
s22, setting the near-wall flow velocity u calculated in the step 1 in FLUENT as the inlet velocity of the submarine pipeline suspended span section, and calculating the discrete value of the submarine pipeline bottom coefficient omega corresponding to the pipeline flow-around velocity u by adopting a k-model.
S3, calculating the submarine pipeline lift coefficient C under the small clearance influence factor by adopting a vector integral multi-factor comprehensive evaluation engineering method according to the acquired pipe length L, Reynolds number Re, clearance distance G and submarine pipeline bottom coefficient omegaL。
S4, calculating the lift coefficient C of the small suspended span submarine pipeline by adopting a vector integral multi-factor comprehensive evaluation engineering methodLIn comparison with the results of the current DNV-RF-F109 specification, the current DNV-RF-F109 specification does not take into account the lift coefficient CLHowever, solved according to the invention, CLIs 0.37, and fully considers the influence of the friction stability of the small suspended cross-sea pipeline.
Compared with the prior art, the method considers the influence of ocean current on the suspended span section of the submarine pipeline, and under a specific sea condition, the suspended span section can generate strong flow field interference and has important influence on hydrodynamic coefficient. This consideration also effectively improves the accuracy of the hydrodynamic model of the suspended span section of the subsea pipeline.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (6)
1. A submarine pipeline lift coefficient evaluation method based on small gap influence factors is characterized by comprising the following steps:
acquiring the characteristic coefficient L/G and Reynolds number Re information of the submarine pipeline, and calculating the near-wall flow velocity u of the submarine pipeline under a specific working condition, wherein L is the pipeline length, and G is the gap distance;
determining a physical model and a computational domain of the subsea pipeline: drawing a physical model of the submarine pipeline according to the actual size of the submarine pipeline and the gap distance G between the submarine pipeline and the sea bottom surface, and determining a calculation domain;
calculating a submarine pipeline bottom coefficient omega according to a physical model and a calculation domain of a submarine pipeline suspended span section;
calculating local pressure coefficient C borne by submarine pipelinePAnd local wall friction coefficient Cf；
Calculating the lift coefficient C of the submarine pipeline based on the small clearance influence factor by adopting an actual measurement-based multi-mode strain response engineering method according to the acquired pipeline characteristic coefficient L/G, Reynolds number Re and bottom coefficient omegaL。
2. The method for evaluating the coefficient of lift of a subsea pipeline based on small clearance contributors of claim 1, further characterized by: the method comprises the steps of calculating the near-wall flow velocity u of a submarine pipeline of a ship under a specific working condition, setting underwater actual environment parameters in simulation software, and calculating the near-wall flow velocity u generated by the near-wall surface of the submarine pipeline under different speeds, namely the Reynolds number Re, of ocean currents in a large vortex simulation mode.
3. The method for evaluating the coefficient of lift of a subsea pipeline based on small clearance contributors of claim 1, further characterized by: the submarine pipeline bottom coefficient omega is obtained by adopting the following method:
dividing the mesh of the submarine pipeline suspended span section and setting the boundary conditions of the mesh: wherein, the calculation domain of the suspended span section adopts mixed grid division, and the wall surface domain of the suspended span section adopts unstructured grid; the other areas adopt structured grids, the other areas are set as static areas, the inlets of the other areas are set as speed inlet conditions, and the outlets of the other areas are set as pressure outlet conditions;
and (3) taking the near-wall surface flow velocity u as the inlet velocity of the submarine pipeline suspended span section in simulation software, and calculating the discrete value of the submarine pipeline bottom coefficient omega corresponding to the pipeline winding flow velocity u by adopting a large vortex simulation mode.
4. The method for evaluating the coefficient of lift of a subsea pipeline based on small clearance contributors of claim 1, further characterized by: when acquiring a physical model of a subsea pipeline: the areas adjacent to the wall surfaces 1/5-2/5 of the submarine pipelines in the calculation domain adopt unstructured grids in the calculation domain radius, and other areas adopt structured grids;
the inlet of the calculation domain is set as a speed inlet condition, the pipeline and the seabed bottom surface are set as a fixed wall surface, and the outlet of the calculation domain is set as a pressure outlet condition.
5. The method for evaluating the coefficient of lift of a subsea pipeline based on small clearance contributors of claim 1, further characterized by: the local pressure coefficient CPAnd local wall friction coefficient CfThe following method is adopted for obtaining: setting an included angle between the ocean current and the vertical direction of the submarine pipeline as theta, and setting the clockwise direction as positive and the counterclockwise direction as negative, wherein the ocean current speeds far away from the surface of the sea bed along the ocean current direction and the direction vertical to the submarine pipeline are ucos theta and usin theta respectively; calculating and obtaining a local pressure coefficient C through a pressure coefficient algorithm and a wall surface friction coefficient algorithmPAnd local wall friction coefficient Cf。
6. According to any of claims 1-5The submarine pipeline lift coefficient evaluation method based on the small gap influence factors is further characterized by comprising the following steps: calculating lift coefficient CLThe method comprises the following steps: respectively calculating lift coefficient C based on different Reynolds numbers Re within various set threshold ranges of the small-span submarine pipelineL；
When L/G < 2.5:
when 6.5> L/G > 2.5:
when L/G > 6.5:
wherein: cLIs coefficient of lift, Cp-yIs a y-direction pressure coefficient component, Cf-yIs the y-direction wall friction coefficient component; the coefficient omega of the bottom end of the submarine pipeline, A is the equivalent cross section area, rho is the water density and D is the pipeline radius.
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| US20190265149A1 (en) * | 2016-10-26 | 2019-08-29 | Korea Gas Corporation | Method for calculating permeability of porous medium by using analysis of friction flow characteristic variable in porous medium |
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|---|---|---|---|---|
| CN102359855A (en) * | 2011-08-15 | 2012-02-22 | 上海交通大学 | Forced vibration experiment facility for uniform down-flowing incoming flow of deep sea pipeline sectional model |
| CN105509996A (en) * | 2015-12-29 | 2016-04-20 | 西南石油大学 | Device and method for measuring resistance coefficient and lift coefficient of flow around marine riser |
| US20190265149A1 (en) * | 2016-10-26 | 2019-08-29 | Korea Gas Corporation | Method for calculating permeability of porous medium by using analysis of friction flow characteristic variable in porous medium |
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