CN117034800A - Fluent-based flow field analysis method for reciprocating water injection pump - Google Patents
Fluent-based flow field analysis method for reciprocating water injection pump Download PDFInfo
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- CN117034800A CN117034800A CN202310982556.4A CN202310982556A CN117034800A CN 117034800 A CN117034800 A CN 117034800A CN 202310982556 A CN202310982556 A CN 202310982556A CN 117034800 A CN117034800 A CN 117034800A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000002347 injection Methods 0.000 title claims abstract description 33
- 239000007924 injection Substances 0.000 title claims abstract description 33
- 238000004458 analytical method Methods 0.000 title claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 238000009826 distribution Methods 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 12
- 238000011069 regeneration method Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
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- Mathematical Physics (AREA)
- Computing Systems (AREA)
- Algebra (AREA)
- Computational Mathematics (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention provides a flow field analysis method of a reciprocating water injection pump based on Fluent, which comprises the following steps: (1) writing UDF for controlling the movement of the plunger and the valve core; (2) establishing a runner model and carrying out grid division; (3) Grid detection is carried out through Fluent software, and grid units are set; (4) loading a turbulence energy model, and selecting fluid properties; (5) importing UDF and setting boundary conditions and dynamic grid parameters; (6) performing initialization setting; (7) setting parameters and monitoring flow field cloud picture change; (8) Setting a solving step length and iteration precision, and checking a flow field distribution change result after solving. According to the invention, through the mutual coupling between the plunger and the valve core motion and the flow field change, the valve core motion changes the flow field area and parameters, and in turn, the change of the flow field parameters changes the stress condition acting on the valve core, so that the actual change condition of the valve core and the flow field is simulated more truly and accurately.
Description
Technical Field
The invention relates to the field of reinforcement of ocean platform steel structures, in particular to a flow field analysis method of a reciprocating water injection pump based on Fluent.
Background
As crude oil is continuously produced, resulting in a drop in reservoir pressure, well production is greatly reduced and even shut down. In order to maintain the pressure of the oil layer and realize the stable and high yield of the oil field, the reciprocating water injection pump has become an important device for crude oil exploitation. The flow field analysis of the reciprocating water injection pump is an indispensable step for researching the reciprocating water injection pump. At present, the flow field analysis of the hydraulic end of the reciprocating water injection pump is mostly to perform constant value simulation on the movement of the valve core, and the simulation result reflects the movement rule of the valve core and the internal flow field characteristics and the actual situation errors are larger. The defects and the shortcomings of the hydraulic end of the water injection pump can be analyzed by accurately simulating the flow field of the reciprocating water injection pump, so that the structure of the reciprocating water injection pump can be optimized and improved. The flow field analysis method of the reciprocating water injection pump based on Fluent can realize the mutual coupling of the valve core motion and the flow field, more accurately reflect the actual valve core motion law and the flow field distribution change, and has important significance for the design and optimization of the hydraulic end of the reciprocating water injection pump.
Disclosure of Invention
The embodiment of the invention provides a flow field analysis method of a reciprocating water injection pump based on Fluent. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The embodiment of the invention provides a flow field analysis method of a reciprocating water injection pump based on Fluent, which is improved in that the method comprises the following steps: :
(1) Writing UDF for controlling the movement of the plunger and the valve core;
(2) Establishing a runner model and carrying out grid division;
(3) Grid detection is carried out through Fluent software, and grid units are set;
(4) Loading a turbulence energy model and selecting fluid properties;
(5) Importing UDF and setting boundary conditions and dynamic grid parameters;
(6) Performing initialization setting;
(7) Setting parameters and monitoring the change of a flow field cloud picture;
(8) Setting a solving step length and iteration precision, and checking a flow field distribution change result after solving.
Preferably, the step (1) includes calculating a plunger motion equation according to a crank-link mechanism motion law; the valve core is subjected to stress analysis and pushed to a valve core stress balance equation; and writing the UDF for controlling the movement of the plunger and the valve core according to the analysis.
Further, the motion of the valve core needs to use a function F_V (F, t) to obtain the speed in the y-axis direction; F_AREA (A, F, t) obtains the true AREA vector A of a given face F in the grid cell t; f_p (F, t) obtains the pressure P of a given face F in the grid cell t; according to the function, the data of the valve core in each time step under the action of the fluid are automatically obtained, the stress and the speed value in each time step are calculated according to Newton's second law, the passive movement of the valve core is realized, and the actual change condition of the valve core and the flow field is simulated.
Preferably, the step (2) comprises establishing a reciprocating plunger pump fluid end flow path model, and meshing with ICEM software.
Further, a hydraulic end model of the reciprocating water injection pump is simplified, a runner model of the reciprocating water injection pump is built, a grid division type adopts a mixed grid, a plunger movement area adopts a tetrahedron grid, and a valve core movement area structure is complex and adopts a hexahedral grid.
Preferably, the step (3) includes detecting the divided grid file through Fluent software, checking whether the divided grid is correct, and setting a grid unit.
Preferably, the step (4) includes loading a turbulent energy model to select a Realizable k-epsilon model, and the fluid property to select fluid to select liquid water.
Preferably, the step (5) includes introducing UDF for controlling the movement of the plunger and the valve core, opening the moving mesh, and selecting a mesh regeneration method.
Further, the regeneration method includes (8-1) adapting to the change in the calculation region by stretching, compressing the mesh or increasing, decreasing the mesh and locally generating the mesh; (8-2) selecting a mode of combining spring fairing, layering and grid reconstruction to carry out grid regeneration, setting proper grid change parameters and creating a motion area;
(8-3) setting boundary conditions as pressure inlet and pressure outlet.
Preferably, the step (7) includes creating a required cloud image by Graphics under Results, and setting up monitoring cloud image changes under solutions.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
according to the invention, through the mutual coupling between the plunger and the valve core motion and the flow field change, the valve core motion changes the flow field area and parameters, and in turn, the change of the flow field parameters changes the stress condition acting on the valve core, so that the actual change condition of the valve core and the flow field is simulated more truly and accurately.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow chart of a method for flow field analysis of a reciprocating water injection pump based on Fluent, according to an exemplary embodiment;
FIG. 2 is a schematic flow path model diagram of a reciprocating water injection pump, according to an exemplary embodiment;
FIG. 3 is a schematic diagram of a flow field pressure cloud of a reciprocating water injection pump, according to an example embodiment;
fig. 4 is a flow field velocity cloud schematic of a T-reciprocating water injection pump, according to an example embodiment.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. Various embodiments are described herein in a progressive manner, each embodiment focusing on differences from other embodiments, and identical and similar parts between the various embodiments are sufficient to be seen with each other. The structures, products and the like disclosed in the embodiments correspond to the parts disclosed in the embodiments, so that the description is relatively simple, and the relevant parts refer to the description of the method parts.
Example 1
The invention provides a flow field analysis method of a reciprocating water injection pump based on Fluent, which comprises the following steps:
1. calculating a plunger motion equation according to a crank-connecting rod mechanism motion law; the valve core is subjected to stress analysis and pushed to a valve core stress balance equation; and according to the analysis, writing the UDF for controlling the movement of the plunger and the valve core, wherein the rigid body movement of the plunger and the valve core is controlled by a DEFINE_CGMOTION (name, dt, vel, omega, time, dtime) macro-control in the writing of the UDF.
The motion of the valve core needs to use a function F_V (F, t) to obtain the speed in the y-axis direction; F_AREA (A, F, t) obtains the true AREA vector A of a given face F in the grid cell t; f_p (F, t) obtains the pressure P of a given face F in the grid cell t; according to the function, automatically acquiring data of each time step of the valve core under the action of fluid, calculating stress and speed values of each time step according to Newton's second law, further realizing passive movement of the valve core, and simulating actual change conditions of the valve core and a flow field;
2. according to the hydraulic end model of the reciprocating water injection pump, simplifying and establishing a hydraulic end flow channel model of the reciprocating plunger pump, and carrying out grid division by utilizing grid division software ICEM in ANSYS, wherein the method comprises the following steps: importing a model, naming boundaries, selecting grid types, selecting grid sizes and exporting grids, wherein the grid division types adopt mixed grids, the plunger movement area adopts tetrahedral grids, and the valve core movement area has a complicated structure and adopts hexahedral grids;
3. importing the divided grid file into Fluent software, detecting grids, checking whether the divided grids are correct, and setting grid units: mm;
4. loading a Realizable k-epsilon turbulence energy model, and selecting corresponding fluid properties, a solver and a solving method, wherein the fluid is liquid water;
5. introducing UDF for controlling the movement of the plunger and the valve core in the step 1, opening a movable grid, and selecting a grid regeneration method:
the dynamic mesh technique mainly adapts to the change in the computation area by stretching, compressing or adding, subtracting meshes and locally generating meshes. Since there are many ways of updating the calculation area, the algorithm for calculating the dynamic grid adjusted by the internal grid node is different, and mainly includes a layering model, a local grid reconstruction model, and an elastic fairing model. Selecting a mode of combining spring fairing, layering and grid reconstruction to carry out grid regeneration, setting proper grid change parameters and creating a motion area;
setting boundary conditions as a pressure inlet and a pressure outlet;
6. selecting an initialization condition and initializing;
7. setting the required monitoring pressure cloud picture, speed cloud picture and other change parameters and the required position flow field cloud picture change monitoring; setting various parameters to be monitored in Monitors; graphics under Results create the required cloud and then set up to monitor the cloud changes under solutions.
8. Setting a solving step length and iteration precision, adopting a Fluent self-contained solver to solve, and checking a flow field distribution change result after solving.
It is to be understood that the invention is not limited to the arrangements and instrumentality shown in the drawings and described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A flow field analysis method of a reciprocating water injection pump based on Fluent is characterized by comprising the following steps:
(1) Writing UDF for controlling the movement of the plunger and the valve core;
(2) Establishing a runner model and carrying out grid division;
(3) Grid detection is carried out through Fluent software, and grid units are set;
(4) Loading a turbulence energy model and selecting fluid properties;
(5) Importing UDF and setting boundary conditions and dynamic grid parameters;
(6) Performing initialization setting;
(7) Setting parameters and monitoring the change of a flow field cloud picture;
(8) Setting a solving step length and iteration precision, and checking a flow field distribution change result after solving.
2. The Fluent-based reciprocating water injection pump flow field analysis method of claim 1, wherein the step (1) comprises calculating a plunger motion equation according to a crank-link mechanism motion law; the valve core is subjected to stress analysis and pushed to a valve core stress balance equation; and writing the UDF for controlling the movement of the plunger and the valve core according to the analysis.
3. The Fluent-based flow field analysis method of the reciprocating water injection pump of claim 2, wherein the movement of the valve core is required to obtain the velocity in the y-axis direction by using a function f_v (F, t); F_AREA (A, F, t) obtains the true AREA vector A of a given face F in the grid cell t; f_p (F, t) obtains the pressure P of a given face F in the grid cell t; according to the function, the data of the valve core in each time step under the action of the fluid are automatically obtained, the stress and the speed value in each time step are calculated according to Newton's second law, the passive movement of the valve core is realized, and the actual change condition of the valve core and the flow field is simulated.
4. The Fluent-based flow field analysis method of the reciprocating water injection pump of claim 1, wherein the step (2) comprises establishing a flow path model of the hydraulic end of the reciprocating plunger pump, and performing grid division by using grid division software ICEM in ANSYS.
5. The Fluent-based flow field analysis method for the reciprocating water injection pump, as set forth in claim 4, is characterized in that the hydraulic end model of the reciprocating water injection pump is simplified and a flow channel model is established, the grid division type adopts a mixed grid, the plunger movement area adopts a tetrahedron grid, and the valve core movement area adopts a hexahedral grid with a complex structure.
6. The method for analyzing the flow field of the reciprocating water injection pump based on Fluent according to claim 1, wherein the step (3) comprises the steps of detecting grids of the divided grid file through Fluent software, checking whether the divided grids are correct or not, and setting grid units.
7. The method of claim 1, wherein the step (4) comprises loading a turbulent energy model to select a Realizable k-epsilon model, and the fluid property to select fluid to select liquid water.
8. The method for analyzing the flow field of the reciprocating water injection pump based on Fluent according to claim 1, wherein the step (5) comprises the steps of introducing UDF for controlling the movement of the plunger and the valve core, opening a movable grid, and selecting a grid regeneration method.
9. The Fluent-based reciprocating water injection pump flow field analysis method of claim 8, wherein said regeneration method comprises
(8-1) adapting to the change in the computation area by stretching, compressing or increasing or decreasing the mesh and locally generating the mesh; (8-2) selecting a mode of combining spring fairing, layering and grid reconstruction to carry out grid regeneration, setting proper grid change parameters and creating a motion area;
(8-3) setting boundary conditions as pressure inlet and pressure outlet.
10. The method for analyzing the flow field of the reciprocating water injection pump based on Fluent according to claim 1, wherein the step (7) comprises creating a required cloud image by Graphics under Results, and setting up monitoring cloud image changes under solutions.
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| CN202310982556.4A CN117034800A (en) | 2023-08-07 | 2023-08-07 | Fluent-based flow field analysis method for reciprocating water injection pump |
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| CN202310982556.4A CN117034800A (en) | 2023-08-07 | 2023-08-07 | Fluent-based flow field analysis method for reciprocating water injection pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117993331A (en) * | 2024-04-07 | 2024-05-07 | 山东科技大学 | CFD simulation method for underwater motion gesture of disposable probe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117993331A (en) * | 2024-04-07 | 2024-05-07 | 山东科技大学 | CFD simulation method for underwater motion gesture of disposable probe |
| CN117993331B (en) * | 2024-04-07 | 2024-06-04 | 山东科技大学 | CFD simulation method for underwater motion gesture of disposable probe |
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