A flow field slicing method and system based on structured grid

Abstract

The present invention discloses a flow field slicing method and system based on a structured grid, wherein the method includes: determining a general characterization equation for a plane where a preset cross section is located; reading all information of a numerically simulated flow field; determining whether a structural grid boundary surface edge intersects with the plane where the preset cross section is located, and if so, marking the structural grid block number corresponding to the intersecting structural grid boundary surface edge; determining whether all structural grid unit edges within the marked structural grid block intersect with the plane where the preset cross section is located; determining whether a structural grid unit intersects with the plane where the preset cross section is located based on all intersection information generated by the intersection of the structural grid units; if an intersection is generated, recording the intersection and assigning the flow field information of the structural grid unit to the intersection; and outputting all information of the intersection between the structural grid unit and the plane where the preset cross section is located. The present invention has the advantages of simple operation, high robustness, high efficiency, and controllable error.

Description

Technical Field

[0001] The present invention belongs to the field of computational fluid and flow display technology, and in particular relates to a flow field slicing method and system based on a structured grid. Background Art

[0002] With the development of computational fluid dynamics (CFD), numerical simulation has been applied to complex flow mechanism research and aerodynamic analysis. CFD calculation results can be analyzed using certain flow field post-processing software. Through flow field slicing and other methods, flow phenomena can be clearly visualized and flow patterns analyzed.

[0003] When it is necessary to process flow field information on a local cross section, the functions of some current commercial software are not convenient enough. In addition, due to different requirements for structural grids, some unresolvable anomalies may occur when processing some flow field slices. Summary of the Invention

[0004] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a flow field slicing method and system based on a structured grid, which has the advantages of simple operation, high robustness, high efficiency and controllable error.

[0005] The object of the present invention is achieved through the following technical solutions: a flow field slicing method based on a structural grid, comprising: determining a general characterization equation of the plane where a preset section is located; reading all information of the numerical simulation flow field in sequence according to the reading order of the structural grid; wherein all information of the numerical simulation flow field includes grid node information and structural grid unit flow field variable information; judging whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located, and if so, marking the structural grid block number corresponding to the intersecting structural grid boundary surface edge line; judging whether all structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located, and recording all intersection point information generated by the intersection of the structural grid units; judging whether the structural grid unit generates an intersection surface with the plane where the preset section is located, and if so, recording the intersection surface and assigning the flow field information of the structural grid unit to the intersection surface; outputting all information of the intersection surface generated by the structural grid unit and the plane where the preset section is located.

[0006] In the above-mentioned structured grid flow field slicing method, the general characterization equation of the plane where the preset section is located is obtained by the following formula:

[0007] Ax+By+Cz+D=0;

[0008] Where A is the first scalar constant, B is the second scalar constant, C is the third scalar constant, D is the fourth scalar constant, x is the x-axis coordinate value of any point on the cross section, y is the y-axis coordinate value of any point on the cross section, and z is the z-axis coordinate value of any point on the cross section;

[0009] The coordinate system is a right-hand coordinate system, determined according to the right-hand rule. The origin of the coordinate system is at (0,0,0). Place your right hand at the origin with your thumb pointing in the positive direction of the x-axis, your index finger pointing in the positive direction of the y-axis, and the direction pointed by your middle finger is the positive direction of the z-axis.

[0010] In the above structured grid-based flow field slicing method, the flow field numerically simulated based on the structured grid will be output in a preset order.

[0011] In the above-mentioned structured grid flow field slicing method, when judging whether the edge of the structured grid boundary surface intersects with the plane where the preset section is located, the method adopted is as follows: obtain the distance between one end point of the edge of the structured grid boundary surface and the plane where the preset section is located; obtain the distance between the other end point of the edge of the structured grid boundary surface and the plane where the preset section is located; obtain the normal projection length of the edge of the structured grid boundary surface to the plane where the preset section is located; based on the distance between one end point of the edge of the structured grid boundary surface and the plane where the preset section is located, the distance between the other end point of the edge of the structured grid boundary surface and the plane where the preset section is located, and the normal projection length of the edge of the structured grid boundary surface to the plane where the preset section is located, it can be judged whether the edge of the structured grid boundary surface intersects with the plane where the preset section is located.

[0012] In the above-mentioned structural grid flow field slicing method, when judging whether all the structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located, the method adopted is as follows: obtain the distance between one end point of all the structural grid unit edges in the marked structural grid block and the plane where the preset section is located; obtain the distance between the other end point of all the structural grid unit edges in the marked structural grid block and the plane where the preset section is located; obtain the normal projection length of all the structural grid unit edges in the marked structural grid block to the plane where the preset section is located; based on the distance between one end point of all the structural grid unit edges in the marked structural grid block and the plane where the preset section is located, the distance between the other end point of all the structural grid unit edges in the marked structural grid block and the plane where the preset section is located, and the normal projection length of all the structural grid unit edges in the marked structural grid block to the plane where the preset section is located, it can be judged whether all the structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located.

[0013] In the above-mentioned structured grid flow field slicing method, when judging whether the structured grid unit intersects with the plane where the preset section is located, when there are two or fewer intersection points, the structured grid unit and the plane where the preset section is located will not intersect; when there are three to six intersection points, the structured grid unit and the plane where the preset section is located will intersect, and the generated intersections need to be recorded in a preset order, and the repeatedly calculated intersections must be shielded.

[0014] A flow field slicing system based on a structured grid comprises: a first module for determining a general characterization equation for a plane where a preset section is located; a second module for sequentially reading all information of a numerically simulated flow field in the order in which the structured grid is read; wherein the all information of the numerically simulated flow field includes grid node information and flow field variable information of the structured grid unit; a third module for determining whether an edge line of a structured grid boundary surface intersects with the plane where the preset section is located, and if so, marking the structured grid block number corresponding to the intersecting edge line of the structured grid boundary surface; a fourth module for determining, based on the structured grid block number corresponding to the marked intersecting edge line of the structured grid boundary surface, whether all the edge lines of the structured grid units in the marked structured grid block intersect with the plane where the preset section is located, and recording all intersection point information generated by the intersection of the structured grid units; a fifth module for determining, based on all intersection point information generated by the intersection of the structured grid units, whether an intersection is generated with the plane where the preset section is located, and if so, recording the intersection and assigning the flow field information of the structured grid unit to the intersection point; and a sixth module for outputting all information of the intersection generated by the structured grid unit and the plane where the preset section is located.

[0015] In the above-mentioned structured grid flow field slicing system, the general characterization equation of the plane where the preset section is located is obtained by the following formula:

[0016] Ax+By+Cz+D=0;

[0017] Where A is the first scalar constant, B is the second scalar constant, C is the third scalar constant, D is the fourth scalar constant, x is the x-axis coordinate value of any point on the cross section, y is the y-axis coordinate value of any point on the cross section, and z is the z-axis coordinate value of any point on the cross section;

[0018] The coordinate system is a right-hand coordinate system, determined according to the right-hand rule. The origin of the coordinate system is at (0,0,0). Place your right hand at the origin with your thumb pointing in the positive direction of the x-axis, your index finger pointing in the positive direction of the y-axis, and the direction pointed by your middle finger is the positive direction of the z-axis.

[0019] In the above structured grid-based flow field slicing system, the flow field numerically simulated based on the structured grid will be output in a preset order.

[0020] In the above-mentioned structured grid flow field slicing system, when judging whether the edge line of the structured grid boundary surface intersects with the plane where the preset section is located, the method adopted is as follows: obtaining the distance between one end point of the edge line of the structured grid boundary surface and the plane where the preset section is located; obtaining the distance between the other end point of the edge line of the structured grid boundary surface and the plane where the preset section is located; obtaining the normal projection length of the edge line of the structured grid boundary surface to the plane where the preset section is located; based on the distance between one end point of the edge line of the structured grid boundary surface and the plane where the preset section is located, the distance between the other end point of the edge line of the structured grid boundary surface and the plane where the preset section is located, and the normal projection length of the edge line of the structured grid boundary surface to the plane where the preset section is located, it can be judged whether the edge line of the structured grid boundary surface intersects with the plane where the preset section is located.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) Based on the numerical simulation flow field obtained by CFD method, the present invention successfully realizes the extraction of flow field of any cross section of the structured grid by adopting certain mathematical criteria and grid structure analysis;

[0023] (2) The present invention is completely autonomous and controllable;

[0024] (3) The present invention can be modified and transplanted according to different structural grid reading orders, and the method has good adaptability;

[0025] (4) The present invention conducts robustness research and improvement on special-shaped structured grids, and the program has high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 This is a flow chart of a structured grid flow field slicing method provided by an embodiment of the present invention;

[0028] FIG2( a ) is a schematic diagram of the result of sectioning a simplified structural grid provided by an embodiment of the present invention;

[0029] FIG2( b ) is another schematic diagram of the result of sectioning a simplified structural grid provided by an embodiment of the present invention;

[0030] FIG2( c ) is another schematic diagram of the result of sectioning the simplified structural grid provided by an embodiment of the present invention;

[0031] FIG3( a ) is a schematic diagram of a sectioning result of a real complex structure grid provided by an embodiment of the present invention;

[0032] FIG3( b ) is another schematic diagram of the result of sectioning a real complex structure grid provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Figure 1 This is a flow chart of the structured grid flow field slicing method provided by an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0035] Determine the general characterization equation of the plane where the preset section is located;

[0036] All information of the numerical simulation flow field is read in sequence according to the reading order of the structural grid; wherein all information of the numerical simulation flow field includes grid node information and flow field variable information of the structural grid unit;

[0037] Determine whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located, and if so, mark the structural grid block number corresponding to the intersecting edge line of the structural grid boundary surface;

[0038] According to the structural grid block number corresponding to the marked intersecting structural grid boundary surface edge line, all structural grid unit edges in the marked structural grid block are judged to see whether they intersect with the plane where the preset section is located, and all intersection point information generated by the intersection of the structural grid units is recorded;

[0039] Based on all the intersection information generated by the intersection of the structural grid units, the structural grid units are judged to determine whether they intersect with the plane where the preset section is located. If an intersection occurs, the intersection is recorded and the flow field information of the structural grid units is assigned to the intersection.

[0040] Output all information about the intersection between the structural mesh unit and the plane where the preset section is located.

[0041] Specifically, the method includes the following steps:

[0042] Step S1: Determine the general characterization equation of the plane where the required section is located by given three-point coordinates or other means.

[0043] Step S2: all the information of the numerical simulation flow field is read in sequence according to the reading order of the structural grid, including the grid node information and the flow field variable information of the structural grid unit.

[0044] Step S3: First, determine whether the edge line of the structural grid boundary surface intersects with the plane where the section to be extracted is located, and mark the structural grid block number corresponding to the intersecting edge line.

[0045] Step S4: according to the node numbering order of the structural grid, determine whether all structural grid unit edges in the marked structural grid block intersect with the plane where the section is located, and then record all intersection information generated by the intersection of the structural grid units.

[0046] Step S5: According to the intersection information generated in the previous step, determine whether the structural grid unit intersects with the plane where the cross section is located. If an intersection occurs, record it and assign the flow field information of the structural grid unit to the intersection.

[0047] Step S6: Output all information of the intersection between the structural grid unit and the plane where the cross section is located in a certain output mode.

[0048] In step S1, the general characterization equation of the plane is:

[0049] Ax+By+Cz+D=0;

[0050] Where A is the first scalar constant, B is the second scalar constant, C is the third scalar constant, D is the fourth scalar constant, x is the x-axis coordinate value of any point on the cross section, y is the y-axis coordinate value of any point on the cross section, and z is the z-axis coordinate value of any point on the cross section;

[0051] The coordinate system is a right-hand coordinate system, determined according to the right-hand rule. The origin of the coordinate system is at (0,0,0). Place your right hand at the origin with your thumb pointing in the positive direction of the x-axis, your index finger pointing in the positive direction of the y-axis, and the direction pointed by your middle finger is the positive direction of the z-axis.

[0052] By using the input of three non-collinear coordinates

[0053] (x1,y1,z1),(x2,y2,z2),(x3,y3,z3)

[0054] You can calculate A, B, C, and D. You can also determine the values ​​of A, B, C, and D in other ways. Here we only list a common method of determining three non-collinear points.

[0055] In step S2, the numerical simulation flow field based on the structured grid will be output in a predetermined order. Different numerical simulation programs have slightly different orders. This embodiment can be modified and transplanted according to the actual order.

[0056] In step S3, when determining whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located, the method used is as follows:

[0057] Obtain the distance between an endpoint of the edge line of the structural grid boundary surface and the plane where the preset section is located;

[0058] Obtain the distance between the other end point of the edge line of the structural grid boundary surface and the plane where the preset section is located;

[0059] Obtain the normal projection length of the edge line of the structural grid boundary surface to the plane where the preset section is located;

[0060] Whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located can be determined based on the distance between one end point of the edge line of the structural grid boundary surface and the plane where the preset section is located, the distance between the other end point of the edge line of the structural grid boundary surface and the plane where the preset section is located, and the normal projection length of the edge line of the structural grid boundary surface to the plane where the preset section is located.

[0061] Specifically, the method used is as follows:

[0062] The distance from point X1 (x1, y1, z1) to the plane Ax+By+Cz+D=0 is:

[0063] The distance from point X2 (x2, y2, z2) to the plane Ax+By+Cz+D=0 is:

[0064] The normal projection length of the line segment X2X1 to the plane Ax+By+Cz+D=0 can be calculated as

[0065]

[0066] The size relationship between d3, d2, and d1 can be used to determine whether X2X1 intersects the plane. Based on the degree of intersection, the number of intersections can be divided into zero (no intersection), one, or two (the line segment is coplanar with the plane).

[0067] In step S4, when determining whether all the structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located, the method used is as follows:

[0068] Obtaining the distance between an endpoint of an edge line of all structural grid units in the marked structural grid block and the plane where the preset section is located;

[0069] Obtaining the distance between the other end point of the edge line of all structural grid units in the marked structural grid block and the plane where the preset section is located;

[0070] Obtaining the normal projection length of all structural grid unit edges in the marked structural grid block to the plane where the preset section is located;

[0071] Based on the distance between one end point of the edge of all structural grid units in the marked structural grid block and the plane where the preset section is located, the distance between the other end point of the edge of all structural grid units in the marked structural grid block and the plane where the preset section is located, and the normal projection length of all structural grid unit edges in the marked structural grid block to the plane where the preset section is located, it can be determined whether all structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located.

[0072] In step S5, based on the intersection information generated in step S4, the structural grid unit is determined to determine whether it intersects with the plane of the cross section. If an intersection occurs, the intersection is recorded and the flow field information of the structural grid unit is assigned to the intersection. In this step, careful distinction is required: if there are two or fewer intersections, the grid block and the plane will not intersect; if there are three to six intersections, the grid block and the plane will intersect. The resulting intersections need to be recorded in a specific order, and duplicate intersections must be suppressed.

[0073] In step S6, the recorded intersection numbers are output in a certain order. This embodiment uses the Tecplot output format for output, and can be displayed using Tecplot post-processing software.

[0074] In this embodiment, the flow field slice results of the simplified structure grid and the real shape structure grid are used as examples to demonstrate the effect achieved by the present invention.

[0075] (1) For the simplified shape, the mesh slicing results of multiple cross sections are shown, as shown in Figure 2(a), Figure 2(b), and Figure 2(c).

[0076] (2) For the numerical simulation of the flow field of the real-shape structure grid, the grid slicing results of the cross section and the pressure cloud map of the flow field slice are displayed, as shown in Figure 3(a) and Figure 3(b).

[0077] This embodiment also provides a flow field slicing system based on a structured grid, which includes: a first module for determining a general characterization equation of a plane where a preset section is located; a second module for sequentially reading all information of a numerically simulated flow field in the order in which the structured grid is read; wherein all information of the numerically simulated flow field includes grid node information and flow field variable information of a structured grid unit; a third module for determining whether an edge line of a structured grid boundary surface intersects with a plane where a preset section is located, and if so, marking the structured grid block number corresponding to the intersecting edge line of the structured grid boundary surface; a fourth module for determining, based on the structured grid block number corresponding to the marked intersecting edge line of the structured grid boundary surface, whether all the edge lines of the structured grid units in the marked structured grid block intersect with the plane where the preset section is located, and recording all intersection information generated by the intersection of the structured grid units; a fifth module for determining, based on all intersection information generated by the intersection of the structured grid units, whether an intersection is generated with the plane where the preset section is located, and if an intersection is generated, recording the intersection and assigning the flow field information of the structured grid unit to the intersection; and a sixth module for outputting all information of the intersection generated by the structured grid unit and the plane where the preset section is located.

[0078] This embodiment is based on the numerical simulation flow field obtained by the CFD method. By adopting certain mathematical criteria and grid structure analysis, it successfully realizes the extraction of flow fields of arbitrary cross sections for structural grids; this embodiment is completely autonomous and controllable; this embodiment can be modified and transplanted for different structural grid reading orders, and the method has good adaptability; this embodiment has carried out robustness research and improvement on special-shaped structural grids, and the program has high stability.

[0079] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A flow field slicing method based on structured grid, characterized in that include: Determine the general characterization equation of the plane where the preset section is located; All information of the numerical simulation flow field is read in sequence according to the reading order of the structural grid; wherein all information of the numerical simulation flow field includes grid node information and flow field variable information of the structural grid unit; Determine whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located, and if so, mark the structural grid block number corresponding to the intersecting edge line of the structural grid boundary surface; According to the structural grid block number corresponding to the marked intersecting structural grid boundary surface edge line, all structural grid unit edges in the marked structural grid block are judged to see whether they intersect with the plane where the preset section is located, and all intersection point information generated by the intersection of the structural grid units is recorded; Based on all the intersection information generated by the intersection of the structural grid units, the structural grid units are judged to determine whether they intersect with the plane where the preset section is located. If an intersection occurs, the intersection is recorded and the flow field information of the structural grid units is assigned to the intersection. Output all information about the intersection between the structural mesh unit and the plane where the preset section is located.

2. The structured grid flow field slicing method according to claim 1, characterized in that: The general characterization equation of the plane where the preset section is located is obtained by the following formula: Ax+By+Cz+D=0; Wherein, A is the first scalar constant, B is the second scalar constant, C is the third scalar constant, D is the fourth scalar constant, x is the x-axis coordinate value of any point on the cross section, y is the y-axis coordinate value of any point on the cross section, and z is the z-axis coordinate value of any point on the cross section.

3. The structured grid-based flow field slicing method according to claim 1, characterized in that: The numerical simulation flow field based on the structured grid will be output in a preset order.

4. The structured grid-based flow field slicing method according to claim 1, characterized in that: When determining whether the edge line of the structural grid boundary surface intersects the plane where the preset section is located, the method used is as follows: Obtain the distance between an endpoint of the edge line of the structural grid boundary surface and the plane where the preset section is located; Obtain the distance between the other end point of the edge line of the structural grid boundary surface and the plane where the preset section is located; Obtain the normal projection length of the edge line of the structural grid boundary surface to the plane where the preset section is located; Whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located can be determined based on the distance between one end point of the edge line of the structural grid boundary surface and the plane where the preset section is located, the distance between the other end point of the edge line of the structural grid boundary surface and the plane where the preset section is located, and the normal projection length of the edge line of the structural grid boundary surface to the plane where the preset section is located.

5. The structured grid-based flow field slicing method according to claim 1, characterized in that: When judging whether all the structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located, the method used is as follows: Obtaining the distance between an endpoint of an edge line of all structural grid units in the marked structural grid block and the plane where the preset section is located; Obtaining the distance between the other end point of the edge line of all structural grid units in the marked structural grid block and the plane where the preset section is located; Obtaining the normal projection length of all structural grid unit edges in the marked structural grid block to the plane where the preset section is located; Based on the distance between one end point of the edge of all structural grid units in the marked structural grid block and the plane where the preset section is located, the distance between the other end point of the edge of all structural grid units in the marked structural grid block and the plane where the preset section is located, and the normal projection length of all structural grid unit edges in the marked structural grid block to the plane where the preset section is located, it can be determined whether all structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located.

6. The structured grid-based flow field slicing method according to claim 1, characterized in that: When judging whether the structural grid unit intersects with the plane where the preset section is located, if there are two or fewer intersection points, the structural grid unit will not intersect with the plane where the preset section is located; if there are three to six intersection points, the structural grid unit will intersect with the plane where the preset section is located. The generated intersections need to be recorded in the preset order, and the repeatedly calculated intersections must be shielded.

7. A flow field slicing system based on a structured grid, characterized by include: The first module is used to determine the general characterization equation of the plane where the preset section is located; The second module is used to read all the information of the numerical simulation flow field in sequence according to the reading order of the structural grid; wherein all the information of the numerical simulation flow field includes grid node information and structural grid unit flow field variable information; The third module is used to determine whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located, and if so, mark the structural grid block number corresponding to the intersecting edge line of the structural grid boundary surface; The fourth module is used to determine whether all the structural grid unit edges in the marked structural grid block intersect with the plane where the preset section is located according to the structural grid block number corresponding to the marked intersecting structural grid boundary surface edge, and record all intersection information generated by the intersection of the structural grid units; The fifth module is used to determine whether the structural grid unit intersects with the plane where the preset cross section is located based on all the intersection information generated by the intersection of the structural grid units. If an intersection occurs, the intersection is recorded and the flow field information of the structural grid unit is assigned to the intersection. The sixth module is used to output all information of the intersection between the structural grid unit and the plane where the preset section is located.

8. The structured grid flow field slicing system according to claim 7, characterized in that: The general characterization equation of the plane where the preset section is located is obtained by the following formula: Ax+By+Cz+D=0; Wherein, A is the first scalar constant, B is the second scalar constant, C is the third scalar constant, D is the fourth scalar constant, x is the x-axis coordinate value of any point on the cross section, y is the y-axis coordinate value of any point on the cross section, and z is the z-axis coordinate value of any point on the cross section.

9. The structured grid flow field slicing system according to claim 7, characterized in that: The numerical simulation flow field based on the structured grid will be output in a preset order.

10. The structured grid flow field slicing system according to claim 7, characterized in that: When determining whether the edge line of the structural grid boundary surface intersects the plane where the preset section is located, the method used is as follows: Obtain the distance between an endpoint of the edge line of the structural grid boundary surface and the plane where the preset section is located; Obtain the distance between the other end point of the edge line of the structural grid boundary surface and the plane where the preset section is located; Obtain the normal projection length of the edge line of the structural grid boundary surface to the plane where the preset section is located; Whether the edge line of the structural grid boundary surface intersects with the plane where the preset section is located can be determined based on the distance between one end point of the edge line of the structural grid boundary surface and the plane where the preset section is located, the distance between the other end point of the edge line of the structural grid boundary surface and the plane where the preset section is located, and the normal projection length of the edge line of the structural grid boundary surface to the plane where the preset section is located.

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