Ansys-based intestinal wall and wall surface motion modeling method and device

Abstract

The invention discloses an Ansys-based intestinal tract wall and wall surface motion modeling method and device. The method comprises the following steps: S1, establishing a human body real intestinal tract three-dimensional geometric model; s2, preprocessing the three-dimensional geometric model of the intestinal tract; s3, intestinal wall material parameters are set, and an intestinal wall is simulated; s4, separating a wall surface solid domain from the modified intestinal tract three-dimensional geometric model, carrying out wall surface simulation setting, and dividing grids; s5, by setting load and boundary conditions, wall surface movement setting is achieved in the form of simulating intestinal tract movement; wherein the motion forms comprise creeping, sectional contraction and swinging contraction; and S6, setting solver parameters, and simulating intestinal tract wall and wall surface movement. Loads and constraint conditions can be flexibly adjusted, the variability and adaptability of the model are remarkably enhanced, and the cost of sacrificing the real reflection capability of the model to the actual physiological state is not taken.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical models, and in particular relates to an intestinal wall and wall surface motion modeling method and device based on Ansys. Background Art

[0002] The intestine refers to the digestive tract from the pylorus of the stomach to the anus, and is an important digestive organ in the human body. The intestine is about 7-8 meters long and is divided into two parts: the small intestine and the large intestine. It has a complex structure and rich functions. Due to the significant differences in the shape, direction, wall thickness and other characteristics of different intestinal segments, achieving detailed modeling of the intestine is not only time-consuming, but also subject to high technical challenges and large simulation calculations.

[0003] The intestinal movement pattern is complex, and the intestinal movement characteristics are completely different in different intestinal segments and under different physiological conditions. The movement of the small intestine is more regular than that of the large intestine, so the current movement modeling of the small intestine region is richer. Three different and typical movement patterns can be observed in the small intestine: peristalsis, swinging contraction, and segmental contraction. Peristalsis involves coordinated circumferential and longitudinal contractions, which produce propulsion for the chyme. Swinging and segmental contractions do not produce net propulsion in the intestinal direction, but are of great significance for the mixing of chyme and the generation of bowel sounds. Existing research has involved all three movement patterns, among which peristalsis and segmental contraction are the two main modules in the intestinal movement pattern, which are usually achieved by setting specified boundary deformation conditions in practice.

[0004] However, the current simulation modeling of the intestinal wall and wall motion has some universal deficiencies. On the one hand, the modeling is highly dependent on the setting of boundary deformation conditions, resulting in poor variability of the model. For example, when a sine wave boundary condition is set, the movement of the model strictly follows this pattern, lacks flexibility, and reduces authenticity. On the other hand, in order to reduce computing power costs, existing models often choose to sacrifice simulation authenticity in exchange for the flexibility of wall motion modeling. The intestinal wall is modeled as a simplified regular geometric structure such as an axisymmetric cylinder. Although it is easy to apply boundary conditions, it significantly limits the model's ability to truly reflect the actual physiological state. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an intestinal wall and wall motion modeling method and device based on Ansys, which can flexibly adjust the load and constraint conditions, significantly enhance the variability and adaptability of the model without sacrificing the model's ability to truly reflect the actual physiological state.

[0006] The technical solution adopted by the present invention is:

[0007] In a first aspect, the present application discloses a method for modeling intestinal wall and wall motion based on Ansys, including:

[0008] S1. Establish a three-dimensional geometric model of the human intestine;

[0009] S2, preprocessing the intestinal 3D geometric model;

[0010] S3. Setting intestinal wall material parameters to simulate the intestinal wall;

[0011] S4, separating the modified intestinal 3D geometric model into a wall solid domain, performing wall simulation settings and dividing the mesh;

[0012] S5. Setting loads and boundary conditions to simulate intestinal movement forms and realize wall movement settings; wherein the movement forms include peristalsis, segmental contraction, and swinging contraction;

[0013] S6. Set the solver parameters to simulate the intestinal wall and wall motion.

[0014] As an optional technical solution, the preprocessing in step S2 includes format conversion and model simplification of the intestinal 3D geometric model.

[0015] As an optional technical solution, in step S3, the setting of the intestinal wall material parameters includes the definition of material properties, the determination of corresponding parameters and the establishment of the intestinal wall simulation constitutive equation.

[0016] As an optional technical solution, the grid division in step S4 includes:

[0017] S41. In the Design Modeler module of Ansys software, the intestinal wall is modeled by establishing a surface and performing surface flipping;

[0018] S42. Set the thickness and material of the intestinal wall to simulate the real intestinal wall, and perform meshing.

[0019] As an optional technical solution, in step S6, the setting of the solver parameters includes the setting of the start time, the end time, and the time step.

[0020] In a second aspect, the present application discloses an intestinal wall and wall motion modeling device based on Ansys, comprising:

[0021] Model building module, used to build a three-dimensional geometric model of the human intestine;

[0022] A preprocessing module, used for preprocessing the intestinal 3D geometric model; wherein the preprocessing includes format conversion and model simplification of the intestinal 3D geometric model;

[0023] A simulation module, used to set intestinal wall material parameters and simulate the intestinal wall; wherein the setting of the intestinal wall material parameters includes the definition of material properties, the determination of corresponding parameters and the establishment of intestinal wall simulation constitutive equations;

[0024] A meshing module is used to separate the modified intestinal 3D geometric model into wall solid domains, perform wall simulation settings and mesh division;

[0025] The wall motion setting module is used to set the load and boundary conditions to simulate the intestinal motion form and realize the wall motion setting; wherein the motion form includes peristalsis, segmental contraction, and swinging contraction;

[0026] The solver module is used to set the solver parameters and simulate the intestinal wall and wall motion.

[0027] As an optional technical solution, the grid division module includes:

[0028] The intestinal wall modeling unit is used to create a surface and perform surface flipping in the Design Modeler module of Ansys software to model the intestinal wall;

[0029] The meshing unit is used to set the thickness and material of the intestinal wall to simulate the real intestinal wall and perform meshing.

[0030] As an optional technical solution, the setting of the solver parameters includes the setting of the start time, the end time, and the time step.

[0031] In a third aspect, the present application discloses an electronic device comprising: one or more processors; one or more memories; the one or more memories storing one or more computer programs, the one or more computer programs comprising instructions, which, when executed by the one or more processors, enable the electronic device to perform the method described in the first aspect above.

[0032] In a fourth aspect, the present application discloses a computer-readable medium, comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect above.

[0033] The beneficial effects of the present invention are as follows: in this application, an intestinal geometric model with high physiological realism is adopted, combined with the flexible modeling method of the Ansys platform, which significantly improves the realism of the simulation effect; the load and constraint conditions can be flexibly adjusted to adapt to various types of movement, significantly enhancing the variability and adaptability of the model, and laying a solid foundation for subsequent intestinal motility function analysis without sacrificing the model's ability to truly reflect the actual physiological state. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic flow chart of a method for modeling intestinal wall and wall surface motion based on Ansys in an embodiment;

[0035] Figure 2 Schematic diagram of the three-dimensional geometric model of the selected colon part in the embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of a three-dimensional geometric model of the intestine after being processed by the Space Claim module in an embodiment of the present invention;

[0037] Figure 4 This is a diagram showing the meshing results of the solid domain of the model in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the principle of simulating segmented contraction of the intestinal wall in an embodiment of the present invention;

[0039] Figure 6 This is a diagram showing the setting of parameters for simulating segmented contraction of the intestinal wall in an embodiment of the present invention;

[0040] Figure 7 This is a diagram of a simple support constraint setting for the intestinal wall in an embodiment of the present invention;

[0041] Figure 8 It is a structural diagram of the intestinal wall and wall motion modeling device based on Ansys in the embodiment. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The steps and modules of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Example

[0044] like Figure 1 As shown, this embodiment discloses an intestinal wall and wall surface motion modeling method based on Ansys, including:

[0045] S1. Establish a three-dimensional geometric model of the human intestine;

[0046] S2, preprocessing the intestinal 3D geometric model;

[0047] S3. Setting intestinal wall material parameters to simulate the intestinal wall;

[0048] S4, separating the modified intestinal 3D geometric model into a wall solid domain, performing wall simulation settings and dividing the mesh;

[0049] S5. Setting loads and boundary conditions to simulate intestinal movement forms and realize wall movement settings; wherein the movement forms include peristalsis, segmental contraction, and swinging contraction;

[0050] S6. Set the solver parameters to simulate the intestinal wall and wall motion.

[0051] As an optional implementation, the preprocessing in step S2 includes format conversion and model simplification of the three-dimensional geometric model of the intestine.

[0052] As an optional implementation, in step S3, the setting of the intestinal wall material parameters includes the definition of material properties, the determination of corresponding parameters, and the establishment of the intestinal wall simulation constitutive equation; wherein the constitutive equation is a mathematical model that describes the mechanical behavior of the intestinal wall material under different loads and deformation states, and is used to reflect the relationship between stress and strain of the material. In this embodiment, the material properties of the simulated intestinal wall can be defined as linear elasticity, hyperelasticity or other characteristics, and the constitutive equation forms and parameter settings corresponding to different material properties are different.

[0053] As an optional implementation, the grid division in step S4 includes:

[0054] S41. In the Design Modeler module of Ansys software, the intestinal wall is modeled by establishing a surface and performing surface flipping;

[0055] S42. Set the thickness and material of the intestinal wall to simulate the real intestinal wall, and perform meshing.

[0056] As an optional implementation, in step S6, the setting of the solver parameters includes the setting of the start time, the end time, and the time step.

[0057] In order to better understand the present application, the method of this embodiment is further described below.

[0058] The intestinal wall and wall motion modeling method based on Ansys provided in this embodiment can be roughly divided into the following processes.

[0059] 1. Establish a three-dimensional geometric model of the human intestine.

[0060] Specifically, Figure 2As shown, this example uses the colon module of BodyParts3D for analysis, and the volume of the module is 945.3478 cm 3 .

[0061] 2. Perform preprocessing and modify the three-dimensional geometric model of the intestine to meet the requirements of subsequent simulation processing.

[0062] Specifically, the geometry is shrunk and smoothed in the Space Claim module of Ansys software to simplify the intestinal geometry, and the conversion from the OBJ file format to the CAD solid structure format is realized through Auto Skin, so as to obtain the colon module of BodyParts3D that can be used for subsequent processing, such as Figure 3 shown.

[0063] 3. Set the intestinal wall material parameters to simulate the intestinal wall.

[0064] Specifically, the intestinal wall material can usually be modeled as a linear elastic material or a hyperelastic material based on real physiological experimental data. The linear elastic material parameters include characteristic values ​​such as density, Young's modulus, and Poisson's ratio. The establishment of a hyperelastic material can be completed through characteristic fitting through various methods such as second-order polynomials and third-order Odgen.

[0065] Specifically, in this embodiment, the intestinal wall material is selected as an isotropic linear elastic thin-walled material, and the intestinal wall density is 2000kg / m 3 , the elastic modulus is 10Mpa, the Poisson's ratio is 0.48, and it obeys Hooke's law.

[0066] 4. Separate the modified intestinal 3D geometric model into the wall solid domain, perform wall simulation settings and divide the grid.

[0067] Specifically, the steps include:

[0068] 4.1. In the Design Modeler module of Ansys software, the intestinal wall is modeled by establishing a surface and performing surface flipping.

[0069] 4.2. To simulate the real intestinal wall effect, set the intestinal wall thickness to 0.01m, select top for the offset model, and extend the shell thickness outward. Set the intestinal wall material to linear elastic thin-walled material in the engineering material. For the specific parameters of the linear elastic thin-walled material, refer to step 3. Use the triangle method for meshing, the solver is Notlinear Machanical, and the number of mesh units is 4465, the unit quality is 0.96148, and the solid domain meshing results are as follows: Figure 4 shown.

[0070] 5. Wall motion settings can be realized by simulating different intestinal movement forms by setting loads, boundary conditions, etc.

[0071] Specifically, this embodiment simulates the segmented contraction motion mode of the intestine by setting periodic displacement constraints, sets simple support constraints to limit excessive deformation, couples the fluid domain, and considers the influence of fluid motion on wall motion.

[0072] Specifically, this embodiment is set to simulate segmented contraction with a contraction period of 4s. The principle diagram is as follows: Figure 5 As shown, A represents amplitude, T represents period, and λ represents wavelength. The contraction wavelength is set to 0.07m and the contraction amplitude is 0.001m, which is achieved by applying displacement boundary condition constraints on the wall. The specific settings are as follows Figure 6 As shown; at the same time, set Figure 7 The simple support shown is used to constrain intestinal movement and deformation.

[0073] 6. Set the solver parameters to simulate the intestinal wall and wall motion.

[0074] Specifically, the end time is set to 4s, and the start time and time step are both 0.0005s, so as to realize the simulation of intestinal wall and wall surface motion.

[0075] like Figure 8 As shown, in another embodiment, the present application discloses an intestinal wall and wall surface motion modeling device based on Ansys, comprising:

[0076] Model building module, used to build a three-dimensional geometric model of the human intestine;

[0077] A preprocessing module, used for preprocessing the intestinal 3D geometric model; wherein the preprocessing includes format conversion and model simplification of the intestinal 3D geometric model;

[0078] A simulation module, used to set intestinal wall material parameters and simulate the intestinal wall; wherein the setting of the intestinal wall material parameters includes the definition of material properties, the determination of corresponding parameters and the establishment of intestinal wall simulation constitutive equations;

[0079] A meshing module is used to separate the modified intestinal 3D geometric model into wall solid domains, perform wall simulation settings and mesh division;

[0080] The wall motion setting module is used to set the load and boundary conditions to simulate the intestinal motion form and realize the wall motion setting; wherein the motion form includes peristalsis, segmental contraction, and swinging contraction;

[0081] The solver module is used to set the solver parameters and simulate the intestinal wall and wall motion.

[0082] As an optional implementation, the grid division module includes:

[0083] The intestinal wall modeling unit is used to create a surface and perform surface flipping in the Design Modeler module of Ansys software to model the intestinal wall;

[0084] The meshing unit is used to set the thickness and material of the intestinal wall to simulate the real intestinal wall and perform meshing.

[0085] As an optional implementation, the setting of the solver parameters includes the setting of the start time, the end time, and the time step.

[0086] It should be noted that: Figure 6 The "e" that appears in the . Figure 6 The X in the horizontal coordinate represents the coordinate value of the X-axis direction of the three-dimensional geometric model of the intestine. Figure 6 The Z in the horizontal coordinate represents the coordinate value of the Z-axis direction of the three-dimensional geometric model of the intestine.

[0087] In another embodiment, an electronic device is disclosed, including: one or more processors; one or more memories; the one or more memories store one or more computer programs, and the one or more computer programs include instructions, and when the instructions are executed by the one or more processors, the electronic device executes the method in the above embodiment.

[0088] In another embodiment, a computer-readable medium is disclosed, including a computer program. When the computer program is executed on a computer, the computer is enabled to execute the method in the above embodiment.

[0089] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices, electronic devices, and computer-readable media can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0090] The above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. All technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. The intestinal wall and wall motion modeling method based on Ansys is characterized by: include: S1. Establish a three-dimensional geometric model of the human intestine; S2, preprocessing the intestinal 3D geometric model; S3. Setting intestinal wall material parameters to simulate the intestinal wall; S4, separating the modified intestinal 3D geometric model into a wall solid domain, performing wall simulation settings and dividing the mesh; S5. Setting loads and boundary conditions to simulate intestinal movement forms and realize wall movement settings; wherein the movement forms include peristalsis, segmental contraction, and swinging contraction; S6. Set the solver parameters to simulate the intestinal wall and wall motion.

2. The intestinal wall and wall surface motion modeling method based on Ansys according to claim 1, characterized in that: The preprocessing in step S2 includes format conversion and model simplification of the intestinal 3D geometric model.

3. The intestinal wall and wall surface motion modeling method based on Ansys according to claim 1, characterized in that: In step S3, the setting of the intestinal wall material parameters includes the definition of material properties, the determination of corresponding parameters and the establishment of the intestinal wall simulation constitutive equation.

4. The intestinal wall and wall surface motion modeling method based on Ansys according to claim 1, characterized in that: The grid division in step S4 includes: S41. In the Design Modeler module of Ansys software, the intestinal wall is modeled by establishing a surface and performing surface flipping; S42. Set the thickness and material of the intestinal wall to simulate the real intestinal wall, and perform meshing.

5. The intestinal wall and wall surface motion modeling method based on Ansys according to claim 1, characterized in that: In step S6, the setting of the solver parameters includes the setting of the start time, the end time, and the time step.

6. The intestinal wall and wall surface motion modeling device based on Ansys is characterized by: include: Model building module, used to build a three-dimensional geometric model of the human intestine; A preprocessing module, used for preprocessing the intestinal 3D geometric model; wherein the preprocessing includes format conversion and model simplification of the intestinal 3D geometric model; A simulation module, used to set intestinal wall material parameters and simulate the intestinal wall; wherein the setting of the intestinal wall material parameters includes the definition of material properties, the determination of corresponding parameters and the establishment of intestinal wall simulation constitutive equations; A meshing module is used to separate the modified intestinal 3D geometric model into wall solid domains, perform wall simulation settings and mesh division; The wall motion setting module is used to set the load and boundary conditions to simulate the intestinal motion form and realize the wall motion setting; wherein the motion form includes peristalsis, segmental contraction, and swinging contraction; The solver module is used to set the solver parameters and simulate the intestinal wall and wall motion.

7. The intestinal wall and wall surface motion modeling device based on Ansys according to claim 6, characterized in that: The grid division module comprises: The intestinal wall modeling unit is used to create a surface and perform surface flipping in the Design Modeler module of Ansys software to model the intestinal wall; The meshing unit is used to set the thickness and material of the intestinal wall to simulate the real intestinal wall and perform meshing.

8. The intestinal wall and wall surface motion modeling device based on Ansys according to claim 6, characterized in that: The settings of the solver parameters include the settings of the start time, the end time, and the time step.

9. An electronic device, characterized in that: include: one or more processors; One or more memories; the one or more memories store one or more computer programs, the one or more computer programs include instructions, when the instructions are executed by the one or more processors, the electronic device executes the method as described in any one of claims 1-5.

10. A computer-readable medium, characterized in that The method comprises a computer program, which, when executed on a computer, causes the computer to execute the method according to any one of claims 1 to 5.

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