CFD steady-state simulation method and device based on adjustable opening of v-type ball valve

Abstract

This invention relates to the field of fluid machinery and valve engineering, and discloses a computational fluid dynamics (CFD) steady-state simulation method based on the adjustable opening of a V-type ball valve. This method establishes a three-dimensional geometric model including the valve body, valve sleeve, and V-type ball valve core, defining the cone angle of the V-type ball valve core as a function of the valve opening to achieve a continuously adjustable description of the valve opening. By meshing the internal fluid computational domain of the valve and locally refining the mesh at the valve core leading edge, the valve core-seat gap, and the boundary layer region, and combining the set initial and boundary conditions, the continuity equation and momentum conservation equation are solved using computational fluid dynamics methods to obtain the steady-state flow characteristics of the V-type ball valve at different openings. This invention describes the valve opening change in a functional form, improving the numerical stability of steady-state simulation under small opening conditions, while also improving the accuracy of flow characteristic calculations under large opening conditions, making it suitable for multi-condition parametric analysis of V-type ball valves.

Description

Technical Field

[0001] This invention relates to hydraulic numerical calculation methods in the fields of power engineering and valve manufacturing technology, specifically to a CFD steady-state simulation method and device based on the adjustable opening of a V-type ball valve. Background Technology

[0002] Computational fluid dynamics (CFD), as an effective numerical simulation method, can be used to analyze the flow field characteristics inside a V-type ball valve. However, existing CFD simulation methods still have some problems when simulating the steady-state flow characteristics of a V-type ball valve: Under small opening conditions, the throttling gap between the valve core and the valve seat changes drastically, and the flow rate is highly sensitive to the opening, resulting in significant fluctuations in the numerical calculation results and making it difficult to obtain stable and repeatable simulation results. Under large opening conditions, the flow channel of the traditional ball valve shrinks significantly, resulting in large local resistance. The pressure loss in the steady-state simulation is too high, which deviates from the experimental results. Existing CFD simulation methods typically simplify the ball valve opening to a fixed angle or discrete operating conditions, making it difficult to continuously and accurately describe the ball valve opening change process, thus limiting the simulation accuracy.

[0003] To address these issues, existing techniques have attempted to study the problem by altering the valve core structure or introducing dynamic mesh methods. However, these methods still suffer from drawbacks such as high computational costs, poor model stability, and difficulty in implementing parameterized analysis under multiple operating conditions. Therefore, it is necessary to propose a new steady-state simulation method for V-type ball valves. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a CFD steady-state simulation method and apparatus based on the adjustable opening of a V-type ball valve, in order to solve the problems of deviation between experimental and simulation results, limited accuracy, and excessive cost in related technologies.

[0005] According to a first aspect of the embodiments of this application, a CFD steady-state simulation method based on the adjustable opening of a V-type ball valve is provided, comprising: A three-dimensional geometric model is established, including the valve body, valve sleeve and V-type ball valve core, wherein the leading edge of the V-type ball valve core has a V-shaped structure and its cone angle is an adjustable parameter; The cone angle of the V-type ball valve core is defined as a cone angle function of the valve opening, so as to realize a continuously adjustable description of the valve opening; The fluid computation domain corresponding to the three-dimensional geometric model is meshed, and in order to meet the accuracy requirements of subsequent steady-state flow solutions, the local mesh is refined in the valve core leading edge, the gap between the valve core and the valve seat, and the wall boundary layer region to form a fluid computation mesh for numerical solutions. Based on the fluid computational grid, initial and boundary conditions are set for the fluid computational domain according to the target operating conditions, so that the fluid computational grid meets the computational prerequisites for steady-state numerical solution; Based on the fluid computational grid with pre-set initial and boundary conditions, computational fluid dynamics methods are used to solve the continuity equation and momentum conservation equation, thereby obtaining the steady-state flow characteristics of the V-type ball valve under different opening conditions.

[0006] Optionally, the cone angle function is a continuous function of the valve opening, used to establish the correspondence between the valve opening and the cone angle of the V-type ball valve core.

[0007] Optionally, the cone angle function expression is as follows: ; in, It is a cone angle. For valve opening, The coefficient is the kinetic energy.

[0008] Optionally, the mesh division adopts a three-dimensional unstructured mesh, and the mesh density is set higher in the valve core leading edge region than in other regions.

[0009] Optionally, the initial conditions include fluid properties and the initial state of the flow field, and the boundary conditions include one of an inlet constant pressure boundary, an inlet constant velocity boundary, and an outlet constant pressure boundary.

[0010] Alternatively, without introducing a dynamic mesh, steady-state simulations under different valve opening conditions can be completed by changing the cone angle function.

[0011] According to a second aspect of the embodiments of this application, a CFD steady-state simulation device based on an adjustable opening of a V-type ball valve is provided, comprising: The modeling module is used to create a three-dimensional geometric model that includes the valve body, valve sleeve and V-type ball valve core. The leading edge of the V-type ball valve core has a V-shaped structure and its cone angle is an adjustable parameter. The mesh generation module is used to define the cone angle of the V-type ball valve core as a cone angle function of the valve opening, to divide the fluid computation domain corresponding to the three-dimensional geometric model into a mesh, and to refine the local mesh in the valve core leading edge, the gap between the valve core and the valve seat, and the wall boundary layer region in order to form a fluid computation mesh for numerical solution in order to meet the accuracy requirements of subsequent steady-state flow solution. The setting module is used to set initial conditions and boundary conditions for the fluid computing domain based on the target working conditions, so that the fluid computing grid meets the computational prerequisites for steady-state numerical solution. The simulation module is used to solve the continuity equation and momentum conservation equation using computational fluid dynamics methods based on a fluid computational grid with pre-set initial and boundary conditions, thereby obtaining the steady-state flow characteristics of the V-type ball valve under different opening conditions.

[0012] According to a third aspect of the embodiments of this application, an electronic device is provided, comprising: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors perform the method as described in the first aspect.

[0013] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is provided that stores computer instructions thereon, which, when executed by a processor, implement the steps of the method as described in the first aspect.

[0014] The beneficial effects of the embodiments of the present invention are as follows: This invention parameterizes the cone angle of the V-type ball valve core as a continuous function of the valve opening, achieving a continuously adjustable modeling method for the valve opening and avoiding the accuracy problems caused by traditional discrete opening simulation. Simultaneously, it combines local mesh refinement technology in key areas to improve numerical stability and convergence under small opening conditions. It completes steady-state simulations of multiple openings without introducing dynamic meshes, reducing computational complexity and cost. Therefore, it improves the accuracy of flow and pressure loss prediction under different opening conditions and is suitable for parametric analysis and engineering optimization design under multiple operating conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating a CFD steady-state simulation method based on the adjustable opening of a V-type ball valve, according to an exemplary embodiment.

[0017] Figure 2 This is a perspective view of a valve body according to an exemplary embodiment.

[0018] Figure 3 This is a perspective view of a valve sleeve according to an exemplary embodiment.

[0019] Figure 4 This is a fluid domain diagram of a ball valve illustrated according to an exemplary embodiment.

[0020] Figure 5 This is a structural diagram of a ball valve body according to an exemplary embodiment.

[0021] Figure 6 This is a structural diagram of the leading edge of a ball valve core, according to an exemplary embodiment.

[0022] Figure 7 This is a structural diagram of a ball valve sleeve according to an exemplary embodiment.

[0023] Figure 8 This is a structural diagram of a 5mm wear plate according to an exemplary embodiment.

[0024] Figure 9 This is a structural diagram of a 4mm wear plate according to an exemplary embodiment.

[0025] Figure 10 This is a diagram illustrating the valve and pipe connection structure according to an exemplary embodiment.

[0026] Figure 11 This describes the opening degree and shape of a V-ball valve at different cone angles, according to an exemplary embodiment.

[0027] Figure 12 It is an exemplary embodiment showing a circle with a radius of D=50mm and a fixed 60° and variable cone angle curve (mapped by y→opening).

[0028] Figure 13 This is a characteristic curve diagram of the cone angle and opening degree of a V-type ball valve, illustrated according to an exemplary embodiment.

[0029] Figure 14 This is a comparison chart of the flow characteristic curves of a novel V-type ball valve and a conventional ball valve under different opening conditions, according to an exemplary embodiment.

[0030] Figure 15 This is a block diagram illustrating a CFD steady-state simulation device based on an adjustable opening of a V-type ball valve, according to an exemplary embodiment. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application.

[0032] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used herein are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0033] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0034] Figure 1 This is a flowchart illustrating a CFD steady-state simulation method based on an adjustable opening of a V-type ball valve, according to an exemplary embodiment. Figure 1 As shown, the method may include the following steps: S1. Establish a three-dimensional geometric model including the valve body, valve sleeve and V-type ball valve core, wherein the leading edge of the V-type ball valve core has a V-shaped structure and its cone angle is an adjustable parameter; Specifically, a 3D geometric model of the V-type ball valve can be created using 3D modeling software (such as SolidWorks, CATIA, etc.). This model includes the valve body, valve sleeve, and V-type ball valve core. The leading edge of the V-type ball valve core has a V-shaped structure, and its cone angle can be adjusted according to actual needs, serving as a parameter for subsequent parametric analysis. Figure 2 , Figure 3 and Figure 4 The three-dimensional views of the valve body, valve sleeve, and V-type ball valve core are shown respectively. Figure 5 This is a structural diagram of a ball valve body according to an exemplary embodiment. It shows the assembly configuration of the valve body and valve stem. The valve body adopts a symmetrical flow channel design, forming an internal flow passage coaxial with the pipeline. The valve stem is arranged perpendicular to the flow channel axis to transmit driving force for valve core rotation adjustment. A flange connection structure is provided on the outer side of the valve body, allowing direct bolting to upstream and downstream pipelines, ensuring sealing and structural strength. Figure 6 This is a structural diagram of the leading edge of a ball valve spool according to an exemplary embodiment, clearly showing the geometric profile of a variable cone angle. The leading edge of the spool is an asymmetrical bevel with a cone angle... According to the relative opening x according to the preset function This design differs from traditional fixed cone angle designs. The profile maintains a small cone angle during the small opening stage to achieve fine flow adjustment; during the large opening stage, the cone angle gradually increases to ensure flow capacity under high flow rates. Figure 7 This is a structural diagram of a ball valve sleeve according to an exemplary embodiment. The sleeve is an annular component fitted over the valve core, with its inner wall precisely fitting the outer surface of the valve core to form a sealing pair. The end face of the sleeve has a flow window that matches the V-shaped opening of the valve core. The edge of the window aligns with the leading edge contour of the valve core, allowing for continuous adjustment of the flow area as the valve core rotates. This also prevents fluid from directly scouring the inner wall of the valve body. Figure 8 This diagram illustrates a 5mm wear plate structure according to an exemplary embodiment. The gasket is made of a high-hardness, corrosion-resistant material and is positioned between the valve sleeve and valve body as a vulnerable sealing element. Its annular structure can evenly withstand the frictional force during valve core rotation, effectively isolating direct contact between the valve sleeve and valve body, extending the service life of the core sealing pair, and allowing for individual replacement after wear, thus reducing maintenance costs. Figure 9 The 4mm wear plate structure shown in the exemplary embodiment is identical to the 5mm wear plate structure, differing only in thickness. Wear plates of different thicknesses can be used to compensate for assembly errors or minor wear of the valve core / sleeve. By replacing gaskets of different thicknesses, precise adjustment of the sealing gap can be achieved, ensuring sealing performance and adjustment accuracy under different operating conditions. Figure 10 This demonstrates a flange-gasket-bolt connection method. The flanges at both ends of the valve body are aligned with the pipe flanges, and a spiral wound gasket is placed in the middle to achieve end-face sealing. After the bolts are tightened evenly, a rigid connection is formed, ensuring the integrity of the pipeline system's pressure boundaries. This connection structure can adapt to the operating conditions of different pressure levels and facilitates valve installation and disassembly.

[0035] S2. Define the cone angle of the V-type ball valve core as a cone angle function of the valve opening to achieve a continuously adjustable description of the valve opening; Specifically, the cone angle of the V-type ball valve spool is defined as a cone angle function of the valve opening, used to establish the correspondence between the valve opening and the cone angle of the V-type ball valve spool. This cone angle function can be selected and adjusted according to actual needs. Figure 11 The diagram shows the opening degree and shape of a V-type ball valve with different cone angles: 30°, 45°, 60°, 75°, and 90°.

[0036] The cone angle function is a continuous function of the valve opening, used to establish the correspondence between the valve opening and the cone angle of the V-type ball valve core. The expression of the cone angle function is as follows: in, It is a cone angle. For valve opening, The core of this application lies in introducing a cone angle function to continuously parameterize the opening of the V-type ball valve, thereby avoiding the introduction of dynamic meshes in steady-state CFD simulations, using the kinetic energy coefficient. This technical solution does not rely on... The specific numerical value. In practical applications, This method can be adjusted according to different valve structural characteristics, regulating characteristics, or numerical stability requirements, and it is equally applicable. This application... It is mainly used to illustrate the feasibility and effectiveness of this function form under typical working conditions.

[0037] S3. The fluid computation domain corresponding to the three-dimensional geometric model is meshed, and in order to meet the accuracy requirements of the subsequent steady-state flow solution, the local mesh is refined in the valve core leading edge, the gap between the valve core and the valve seat, and the wall boundary layer region to form a fluid computation mesh for numerical solution. Specifically, in step S3, a three-dimensional unstructured mesh is preferably used to discretize the fluid computational domain. Considering the large flow field gradient in the throttling region under the small opening condition of the V-type ball valve, local mesh refinement is performed at the leading edge of the valve core and in the throttling gap region between the valve core and the valve seat. Simultaneously, a boundary layer mesh is set near the wall to improve the accuracy of capturing velocity and pressure gradients, thereby ensuring the convergence and accuracy of the steady-state numerical calculation.

[0038] The cone angle of the V-type ball valve core is defined as the cone angle function of the valve opening. The fluid computation domain corresponding to the three-dimensional geometric model is meshed. In order to meet the accuracy requirements of subsequent steady-state flow solutions, the local mesh is refined in the valve core leading edge, the gap between the valve core and the valve seat, and the wall boundary layer region to form a fluid computation mesh for numerical solutions.

[0039] S4. Based on the fluid computational grid, set initial and boundary conditions for the fluid computational domain according to the target working conditions, so that the fluid computational grid meets the computational prerequisites for steady-state numerical solution. Specifically, initial and boundary conditions are set for the fluid computational domain according to the target operating conditions. Initial conditions include fluid physical properties (such as density and viscosity) and the initial state of the flow field (such as velocity and pressure). Boundary conditions include one of the following: inlet constant pressure boundary and inlet constant velocity boundary, as well as outlet constant pressure boundary.

[0040] The initial conditions include fluid properties and the initial state of the flow field, and the boundary conditions include one of the inlet constant pressure boundary and the inlet constant velocity boundary, as well as the outlet constant pressure boundary.

[0041] S5. Based on the fluid computational grid with pre-set initial and boundary conditions, the continuity equation and momentum conservation equation are solved using computational fluid dynamics methods to obtain the steady-state flow characteristics of the V-type ball valve under different opening conditions. Specifically, Figure 12This paper presents a comparison of the opening geometry curves corresponding to a fixed 60° cone angle and a variable cone angle function with different k values ​​under a circular constraint of 50mm diameter. The results show that as the k value increases, the outward expansion of the opening curve in the medium-to-high opening region increases, thereby changing the rate of increase in the throttling area and optimizing the flow regulation characteristics in different opening ranges. This is achieved by establishing the circular geometric boundary equation and defining the cone angle as a function of the opening. The mapping relationship is calculated point by point to obtain the opening curves under different k values.

[0042] By solving the equations, the steady-state flow characteristics of the V-type ball valve under different opening conditions can be obtained, such as velocity distribution, pressure distribution, and flow rate.

[0043] Without introducing a dynamic mesh, steady-state simulations under different valve opening conditions can be completed by changing the cone angle function. Figure 13 The diagram shows a comparison of the opening geometry curves corresponding to a fixed 60° cone angle and a variable cone angle function with different kinetic energy coefficient k values ​​(0.5, 1.0, 2.0, 3.0) under a circular constraint with a diameter of 50mm. It also maps the relationship between the opening degree and the opening position. It clearly demonstrates the regulatory effect of the k value on the cone angle change and the rate of increase of the throttling area, and proves that the cone angle function can optimize the flow regulation characteristics in different opening degree ranges.

[0044] Figure 14 This paper presents a comparison of the flow characteristic curves of the novel V-type ball valve and a traditional ball valve at different opening degrees. The curves visually demonstrate that the novel V-type ball valve exhibits a smoother flow increase characteristic in the small opening region, thereby improving flow regulation accuracy; while in the large opening region, it has greater flow capacity and lower fluid resistance. The paper also shows the performance differences in core parameters such as the relationship between flow rate and opening degree, flow control accuracy, and fluid resistance, proving the technical superiority of this invention.

[0045] Figure 15 This is a block diagram of a CFD steady-state simulation device based on an adjustable opening of a V-type ball valve, according to an exemplary embodiment. (Refer to...) Figure 15 The device includes: Modeling module 1 is used to create a three-dimensional geometric model including the valve body, valve sleeve and V-type ball valve core. The leading edge of the V-type ball valve core has a V-shaped structure and its cone angle is an adjustable parameter. Mesh generation module 2 is used to define the cone angle of the V-type ball valve core as a cone angle function of the valve opening, to perform meshing on the fluid computation domain corresponding to the three-dimensional geometric model, and to refine the local mesh in the valve core leading edge, the gap between the valve core and the valve seat, and the wall boundary layer region in order to form a fluid computation mesh for numerical solution in order to meet the accuracy requirements of subsequent steady-state flow solution. Setting module 3 is used to set initial conditions and boundary conditions for the fluid computing domain based on the target working conditions, so that the fluid computing grid meets the computational prerequisites for steady-state numerical solution. Simulation module 4 is used to solve the continuity equation and momentum conservation equation using computational fluid dynamics methods based on the fluid computation grid with pre-set initial and boundary conditions, thereby obtaining the steady-state flow characteristics of the V-type ball valve under different opening conditions.

[0046] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0047] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this application according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0048] Accordingly, this application also provides an electronic device, comprising: one or more processors; a memory for storing one or more programs; and when the one or more programs are executed by the one or more processors, causing the one or more processors to implement the above-described CFD steady-state simulation method based on the adjustable opening of a V-type ball valve.

[0049] Accordingly, this application also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the CFD steady-state simulation method based on the adjustable opening of a V-type ball valve as described above.

[0050] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only.

[0051] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A CFD steady-state simulation method based on the adjustable opening of a V-type ball valve, characterized in that, include: S1. Establish a three-dimensional geometric model including the valve body, valve sleeve and V-type ball valve core, wherein the leading edge of the V-type ball valve core has a V-shaped structure and its cone angle is an adjustable parameter; S2. Define the cone angle of the V-type ball valve core as a cone angle function of the valve opening to achieve a continuously adjustable description of the valve opening; S3. The fluid computation domain corresponding to the three-dimensional geometric model is meshed, and in order to meet the accuracy requirements of the subsequent steady-state flow solution, the local mesh is refined in the valve core leading edge, the gap between the valve core and the valve seat, and the wall boundary layer region to form a fluid computation mesh for numerical solution. S4. Based on the fluid computational grid, set initial and boundary conditions for the fluid computational domain according to the target working conditions so that the fluid computational grid meets the computational prerequisites for steady-state numerical solution. S5. Based on the fluid computational grid with pre-set initial and boundary conditions, the continuity equation and momentum conservation equation are solved using computational fluid dynamics methods to obtain the steady-state flow characteristics of the V-type ball valve under different opening conditions.

2. The method according to claim 1, characterized in that, The cone angle function is a continuous function of the valve opening, used to establish the correspondence between the valve opening and the cone angle of the V-type ball valve core.

3. The method according to claim 1 or 2, characterized in that, The expression for the cone angle function is as follows: ; in, It is a cone angle. For valve opening, The coefficient is the kinetic energy.

4. The method according to claim 1, characterized in that, The mesh division adopts a three-dimensional unstructured mesh, and the mesh density is set higher in the valve core leading edge region than in other regions.

5. The method according to claim 1, characterized in that, The initial conditions include fluid properties and the initial state of the flow field, and the boundary conditions include one of the inlet constant pressure boundary and the inlet constant velocity boundary, as well as the outlet constant pressure boundary.

6. The method according to claim 1, characterized in that, Without introducing a dynamic mesh, steady-state simulations under different valve opening conditions can be completed by changing the cone angle function.

7. A CFD steady-state simulation device based on an adjustable opening of a V-type ball valve, characterized in that, include: The modeling module is used to create a three-dimensional geometric model that includes the valve body, valve sleeve and V-type ball valve core. The leading edge of the V-type ball valve core has a V-shaped structure and its cone angle is an adjustable parameter. The mesh generation module is used to define the cone angle of the V-type ball valve core as a cone angle function of the valve opening, to divide the fluid computation domain corresponding to the three-dimensional geometric model into a mesh, and to refine the local mesh in the valve core leading edge, the gap between the valve core and the valve seat, and the wall boundary layer region in order to form a fluid computation mesh for numerical solution in order to meet the accuracy requirements of subsequent steady-state flow solution. The setting module is used to set initial conditions and boundary conditions for the fluid computing domain based on the target working conditions, so that the fluid computing grid meets the computational prerequisites for steady-state numerical solution. The simulation module is used to solve the continuity equation and momentum conservation equation using computational fluid dynamics methods based on a fluid computational grid with pre-set initial and boundary conditions, thereby obtaining the steady-state flow characteristics of the V-type ball valve under different opening conditions.

8. An electronic device, characterized in that, include: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-6.

9. A computer-readable storage medium storing computer instructions thereon, characterized in that, When executed by the processor, this instruction implements the steps of the method as described in any one of claims 1-6.

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