A toilet flushing simulation method, system, storage medium and product

Abstract

The present invention relates to the field of fluid simulation, and in particular to a toilet flushing simulation method, system, storage medium and product, comprising the following steps: S1: establishing a toilet flushing simulation model; S2: determining material properties of the toilet flushing simulation model; S3: defining a water tank outlet valve body action according to a flushing working condition; S4: defining a flow inlet to generate a water tank water volume and a water seal water volume in an initial stage; S5: performing a pure water flow flushing simulation on the toilet flushing simulation model; S6-S8: respectively establishing a rigid Miso model, a flexible Miso model and a viscous Miso model, and respectively performing a fluid-solid coupling flushing simulation; S9: selecting a corresponding Miso model to perform a fluid-solid coupling simulation test, and outputting toilet structural parameters according to simulation results, so as to guide the structural design or optimization of the toilet; and the method can accelerate product development progress and reduce test costs.

Description

Technical Field

[0001] The invention relates to the field of fluid simulation, and in particular to a toilet flushing simulation method, system, storage medium and product. Background Art

[0002] As an important part of modern sanitary facilities, the performance of toilets is directly related to the user experience and sanitary conditions. Fluid mechanics performance plays a key role in determining the flushing effect, water-saving ability and waste discharge efficiency of toilets. At present, the design of toilets is mostly based on previous experience or experimental basis. Many large manufacturers have introduced computational fluid dynamics analysis to guide the design. The main analysis ideas and methods are to rely on Fluent for fluid scouring simulation. This method has a large amount of calculation and high requirements for mesh division, resulting in the existing scouring simulation focusing on pure fluid scouring simulation. However, in real life, excrement and water flow will produce complex interactions, and the scouring effect of excrement is a key factor in ultimately determining the performance of the toilet.

[0003] Existing toilet flushing simulations are mostly simulated using Fluent computational fluid dynamics software, which is mainly based on traditional grid methods for computational simulation, such as the finite volume method (FVM). Using this method to simulate fluids requires grid division of the fluid area, which has high grid quality requirements, many operating parameters, and a large amount of calculation.

[0004] Most existing methods only focus on the flushing effect of pure fluid, do not consider the effect of Miso and water flow, and do not model Miso. Therefore, the simulation effect of the flushing effect of the toilet is not accurate enough. Summary of the invention

[0005] The object of the present invention is to provide a toilet flushing simulation method, system, storage medium and product with better simulation effect.

[0006] In order to achieve the above object, the present invention adopts such technical solution:

[0007] A toilet flushing simulation method comprises the following steps performed in sequence:

[0008] S1: Obtain a three-dimensional model of the toilet, perform geometric processing on the three-dimensional model of the toilet, and establish a toilet flushing simulation model, which at least includes the outer contour of the toilet, the inner wall surface of the toilet bowl, the upper surface of the water tank, the bottom of the toilet bowl, and the inner wall surface of the pipe;

[0009] S2: Determine the material properties of the toilet flushing simulation model, including toilet material properties, fluid material properties, and Miso material properties;

[0010] S3: Define the action of the water tank outlet valve body according to the flushing working condition to ensure that the simulated working condition is similar to the actual condition;

[0011] S4: define the flow inlet and generate the water volume of the water tank and the water seal in the initial stage;

[0012] S5: Perform pure water flow flushing simulation on the toilet flushing simulation model to verify the reliability of the toilet flushing simulation model;

[0013] S6: According to the Miso material properties, a rigid Miso model is established to perform fluid-solid coupling scour simulation;

[0014] Define the rigid Miso model as a rigid body, define the rigid body density threshold, and import it into the toilet flushing simulation model. The initial position is defined as above the water seal and at the bottom of the basin.

[0015] The rigid Miso model is used to simulate the flushing condition of hard foreign bodies. When the generated rigid Miso model falls into the water, it squeezes out part of the water remaining in the original water seal. As the flushing begins, the rigid Miso model interacts with the water flow and is flushed to the sewage outlet under the action of the water flow. By increasing the number of rigid Miso models, the flushing capacity of the toilet is further tested.

[0016] S7: According to the Miso material properties, a flexible Miso model is established to perform fluid-solid coupling scour simulation;

[0017] In step S7, the flexible Miso model is defined as a flexible body, and the flexible Miso model is allowed to produce flexible deformation. At the same time, the force condition of the flexible Miso model is obtained to analyze the wear condition of the inner wall surface of the bidet or the inner wall surface of the pipe;

[0018] A Wall file is generated based on the flexible Miso model for coupling the multi-body system finite element method with the moving particle fluid analysis method. The flexible Miso model file is imported into the toilet fluid simulation model to build a collaborative simulation model between the two calculation methods. The position and velocity information is transmitted to the fluid through the Wall file, and the reaction force of the fluid is then transmitted back to the multi-body dynamics model for calculation.

[0019] After the generated flexible Miso model falls into the water, it interacts with the fluid and changes the flow field state. As the flushing begins, the force generated by the water flow increases, the flexible Miso model deforms, collides with the inner wall of the basin and the inner wall of the pipe, and is finally flushed out by the water flow.

[0020] S8: According to the Miso material properties, a viscous Miso model is established to perform fluid-solid coupling scour simulation;

[0021] In step S8, the crushing effect and the dispersion effect of the viscous Miso model are realized by a non-Newtonian fluid model, and the viscous Miso model is defined as a Bingham fluid, which is characterized by a slightly rigid high-viscosity fluid before the shear stress of the fluid reaches a specified value, and a viscoplastic fluid when the shear stress exceeds the specified value;

[0022] For a Bingham fluid, its apparent viscosity is:

[0023] ;

[0024] in, is the yield criterion for the Bingham fluid state and the rigid state, is the yield strength, is the average shear velocity, is the plastic viscosity, is the yield coefficient;

[0025] In the case of the low-viscosity viscous Miso model, the viscous Miso model does not adhere much to the inner wall of the basin or the flow channel wall. Under the action of the water flow, the viscous Miso model is quickly dispersed by the water flow. Since the viscous Miso model is dispersed by the water flow in the early stage of flushing, part of the viscous Miso model swirls at the bottom of the basin and is not carried out by the water flow.

[0026] In the high-viscosity viscous Miso model, the viscous Miso model initially falls and adheres to the bottom of the bidet. As the water in the water tank flows out, the water flow flushes the lower part of the viscous Miso model, but the upper part of the viscous Miso model is not completely flushed. After the flushing is completed, the upper part of the viscous Miso model still stays at the bottom of the bidet, and geometrically retains a cylindrical solid-like form.

[0027] S9: According to the applicable scenario of the designed toilet, select the corresponding Miso model to carry out fluid-solid coupling simulation test, and output the structural parameters of the toilet according to the simulation results to guide the structural design or optimization of the toilet.

[0028] Preferably, the MPS method is used to perform geometric processing on the three-dimensional model of the toilet. There is no need to mesh the three-dimensional model of the toilet. Only the outer contour of the toilet is retained, and the solid model is converted into a surface model. The upper surface of the water tank, the upper surface of the bowl and the lower surface of the sewage pipe are extracted to facilitate the subsequent establishment of the pressure boundary.

[0029] Preferably, in step S2, the material property of the toilet is set to ceramic texture, which is defined as a Polygon property, the Young's modulus is 100 GPa, the fluid is defined as a Fluid property, water at 20°C is used as the fluid, and the density is 1000 kg / m 3 , viscosity 1*10 -6m 2 / s, surface tension coefficient 0.072N / m, and the material properties of Miso, that is, the artificial specimen of bean paste, are set to be a cylinder with a length of 100mm and a diameter of 25mm, a weight of about 50g and a soft texture.

[0030] Preferably, in step S3, the action of the water tank outlet valve body is defined according to the single flushing water volume requirement. In order to ensure the stability of the solution process, the water valve is closed in the initial stage. After the fluid is generated and stabilized, the water valve is opened. After the water tank releases the amount of water required by the working condition, the water valve is retracted and the water discharge stops.

[0031] Preferably, in step S5, in order to verify the reliability of the toilet flushing simulation model, a pure water flushing simulation is first performed without introducing the Miso model, and the particle reference size is selected using the following formula (1): the diameter of the rough-selected particle is one-third of the minimum pipe diameter in the flow channel, and the particle distribution coefficient is calculated If it is satisfied, the particle reference size is selected appropriately; if it is not satisfied, the particle reference size is recalculated;

[0032] (1);

[0033] in, is the minimum diameter of the flow channel, To calculate the basin volume, is the number of cores of the computing device, is the coarse particle diameter, is the scaling factor, which is related to the fluid properties.

[0034] A toilet flushing simulation system comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, any one of the above methods is implemented.

[0035] A storage medium comprises a memory, wherein a computer program is stored in the memory, and when the computer program is executed by a processor, any of the above methods is implemented.

[0036] A toilet flushing simulation product includes a computer program, and when the computer program is executed by a processor, any of the above methods is implemented.

[0037] By adopting the aforementioned design scheme, the beneficial effects of the present invention are as follows: the present application can quickly establish a fluid simulation model for flushing a toilet, and by establishing different rigid Miso models, flexible Miso models, and viscous Miso models to match different simulation scenarios, it is possible to quickly verify the flushing capacity of the toilet under different working conditions. Based on the calculation results obtained by the simulation, it is possible to quickly iterate and optimize various structural parameters of the toilet, such as the arc angle and pipe diameter parameters of the jet flow channel, pelvic surface, and sewage flow channel, which has guiding significance for the design of the water seal height and the evaluation of the water consumption of the water tank. After multiple cycles of iterative optimization design, the optimal toilet structure that meets the design requirements can be obtained, which can speed up the product development progress and reduce the testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of the toilet flushing simulation method of the present invention;

[0039] Figure 2 A schematic diagram of a flow chart of establishing a toilet flushing simulation model according to the present invention;

[0040] Figure 3 It is a flow chart of the water outlet valve body action of the present invention;

[0041] Figure 4 It is a pure water flow flushing simulation flow chart of the present invention;

[0042] Figure 5 It is a flow chart of scour simulation of the rigid Miso model of the present invention;

[0043] Figure 6 It is a flow chart of the scouring simulation of the flexible Miso model of the present invention (the water flow is hidden and displayed);

[0044] Figure 7 It is a flow chart of erosion simulation of the viscous Miso model of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] A toilet flushing simulation method, such as Figure 1 As shown, the steps include the following steps performed in sequence:

[0047] S1: Obtain a three-dimensional model of the toilet and perform geometric processing on the three-dimensional model of the toilet, such as Figure 2As shown, a toilet flushing simulation model is established, which at least includes the outer contour of the toilet, the inner wall surface of the bowl, the upper surface of the water tank, the bottom of the bowl and the inner wall surface of the pipe; the pipe here refers to the sewage pipe of the toilet. In this implementation, the MPS method is used to perform geometric processing on the three-dimensional model of the toilet. There is no need to mesh the three-dimensional model of the toilet. Only the outer contour of the toilet is retained, and the solid model is converted into a surface model to facilitate the subsequent establishment of the pressure boundary.

[0048] In this embodiment, the forward model established by the design end can be used, or the existing product can be three-dimensionally reversely reconstructed to obtain the three-dimensional model of the toilet.

[0049] S2: Determine the material properties of the toilet flushing simulation model, including toilet material properties, fluid material properties and Miso material properties; in this application, Miso is an artificial specimen, and Miso is a sausage-shaped object made of bean paste.

[0050] The material properties of the toilet, fluid, and Miso can be obtained by conventional methods such as experimental measurement. In this embodiment, the material property of the toilet is set to ceramic texture, which is defined as a Polygon property, and the Young's modulus is 100GPa. The fluid is defined as a Fluid property, using water at 20°C as the fluid, and the density is 1000kg / m 3 , viscosity 1*10 -6 m 2 / s, surface tension coefficient 0.072N / m. For the material properties of Miso, i.e. the artificial specimen of bean paste, the shape characteristics are set to be a cylinder with a length of 100mm and a diameter of 25mm, a weight of about 50g and a soft texture.

[0051] S3: According to the scouring conditions, such as Figure 3 As shown, the action of the water tank outlet valve is defined to ensure that the simulated working condition is similar to the actual condition; in this embodiment, the action of the water tank outlet valve is defined according to the single flushing water volume requirement. In order to ensure the stability of the solution process, the water valve is closed in the initial stage, and after the fluid is generated and stabilized, the water valve is opened, and after the water tank releases the required amount of water under the working condition, the water valve is retracted and the water discharge stops.

[0052] S4: define the flow inlet and generate the water volume of the water tank and the water seal in the initial stage;

[0053] In this embodiment, a flow inlet is defined above the water tank and the basin, and the water volume of the water tank and the water volume of the water seal in the initial stage are generated according to the flushing requirements and the initial water seal conditions, and the liquid is left to stand for a period of time to stabilize. The flow inlet is defined here so that the water storage capacity of the water tank and the water storage capacity of the water seal of the basin can be defined during modeling, so as to accurately obtain the height of the water in the water tank and the water seal in the basin, which is conducive to the subsequent definition of air pressure.

[0054] S5: Perform pure water flow flushing simulation on the toilet flushing simulation model, such as Figure 4 As shown, the reliability of the verification model is verified;

[0055] In order to verify the reliability of the toilet flushing simulation model, pure water flushing simulation was first performed without introducing the Miso model. In traditional fluid simulation methods, the mesh quality has a significant impact on the simulation results. Similarly, the particle generation size and quality also have an important impact on the calculation results of the MPS method. The following formula (1) is used to select the particle base size: the rough particle diameter is one-third of the smallest pipe diameter in the flow channel, and the particle distribution coefficient is calculated If it is satisfied, the particle reference size is selected appropriately; if it is not satisfied, the particle reference size is recalculated;

[0056] (1);

[0057] in, is the minimum diameter of the flow channel, To calculate the basin volume, is the number of cores of the computing device, is the coarse particle diameter, is the scaling factor, which is related to the fluid properties;

[0058] S6: According to the Miso material properties, a rigid Miso model is established to perform fluid-solid coupling erosion simulation, such as Figure 5 As shown;

[0059] In this embodiment, the Miso is set to be a cylinder with a length of 100 mm and a diameter of 25 mm, a weight of 50 g, a soft texture, and a density greater than water. A rigid Miso model is established and introduced into the toilet flushing simulation model. In order to make Miso act as a rigid body with the fluid, the rigid Miso model is defined as a rigid body, and a rigid body density threshold is defined. In this embodiment, its density is defined as 1150 kg / m 3 ,If necessary, the comparative heat and thermal conductivity can also be set according to actual needs.,The initial position is defined as above the water seal and at the bottom of the basin.

[0060] The generated rigid Miso falls into the water, squeezing out part of the water retained in the original water seal. As the flushing begins, the rigid Miso model interacts with the water flow and is flushed to the sewage outlet under the action of the water flow. The rigid Miso can be used to simulate relatively severe flushing conditions and has a better simulation effect on the flushing of hard foreign objects. By increasing the number of rigid Miso, the flushing capacity of the toilet can be further tested.

[0061] S7: According to the Miso material properties, a flexible Miso model is established to perform fluid-solid coupling scour simulation, such as Figure 6 As shown (in order to clearly show the stress cloud diagram, the water flow is hidden);

[0062] In order to further simulate the actual use scenario of the toilet, the flexible Miso model is defined as a flexible body, allowing the flexible Miso model to produce flexible deformation. At the same time, the force condition of the flexible Miso model is obtained to analyze the wear of the inner wall of the basin or the inner wall of the pipe.

[0063] To this end, in the multi-body dynamics software, the flexible Miso model is meshed and given material properties to make it flexible, and the coupling analysis of the fluid and the flexible body is performed to simulate the large deformation process of the flexible Miso model, so that the result is closer to the actual situation. In this embodiment, the material properties of the flexible Miso model are set to a density of 1150 kg / m 3 , Young's modulus 2.35MPa, Poisson's ratio 0.475, if necessary, the specific heat and thermal conductivity can also be set according to actual needs. Furthermore, the flexible Miso can be allowed to produce plastic deformation, the material properties of the Miso model can be defined as plastic material, and the stress-strain curve parameters of the plastic stage can be assigned.

[0064] Based on the flexible Miso model, a Wall file is generated for coupling the multi-body system finite element method and the moving particle fluid analysis method. The flexible Miso model file is imported into the toilet fluid simulation model to build a collaborative simulation model between the two calculation methods. The position and velocity information is transmitted to the fluid through the Wall file, and the reaction force of the fluid is then transmitted back to the multi-body dynamics model for calculation.

[0065] After the generated flexible Miso model falls into the water, it interacts with the fluid and changes the flow field state. As the flushing begins, the force generated by the water flow increases, the flexible Miso model deforms, and collides with the inner wall of the bidet and the inner wall of the pipe, and is finally flushed out by the water flow. The flexible Miso model can be used to simulate the flushing conditions in life scenes more realistically, which helps to verify the maximum flushing capacity of the toilet. In addition, the simulation of the flexible Miso model will lay the foundation for the subsequent realization of the rigid-flexible fluid-solid coupling analysis of the three media of paper towels, Miso, and fluid.

[0066] S8: According to the Miso material properties, a viscous Miso model (non-Newtonian fluid model) is established to perform fluid-solid coupling scour simulation, such as Figure 7 As shown;

[0067] The non-Newtonian fluid model is used to realize the crushing and dispersion effects of the viscous Miso model. The viscous Miso model is defined as a Bingham fluid, which means that before the shear stress of the fluid reaches a specified value, the fluid is a slightly rigid high-viscosity fluid. When the shear stress exceeds the specified value, it behaves as a viscoplastic fluid with properties similar to those of toothpaste.

[0068] For a Bingham fluid, its apparent viscosity is:

[0069] ;

[0070] in, is the yield criterion for the Bingham fluid state and the rigid state, is the yield strength, is the average shear velocity, is the plastic viscosity, is the yield coefficient.

[0071] In this embodiment, the low viscosity Miso model is a viscous model with a kinematic viscosity of less than 0.1 m 2 / s viscous Miso model, high viscosity viscous Miso model is kinematic viscosity greater than 0.1 m 2 / s and less than 1 m 2 / s's sticky miso model.

[0072] When a low-viscosity viscous Miso model is required, the viscous Miso model with parameters shown in Table 1 may be selected.

[0073] Table 1 Parameters of the viscous Miso model

[0074]

[0075] In the case of a low-viscosity viscous Miso model, the viscous Miso model does not adhere much to the inner wall of the bidet or the inner wall of the flow channel. Under the action of the water flow, the viscous Miso model is quickly dispersed by the water flow. Since the viscous Miso model is dispersed by the water flow at the beginning of the flushing, part of the viscous Miso model swirls at the bottom of the bidet and is not carried out by the water flow.

[0076] When a high viscosity viscous Miso model is required, the viscous Miso model with parameters shown in Table 2 may be selected.

[0077] Table 2 Parameters of the viscous Miso model

[0078]

[0079] In the high-viscosity viscous Miso model, the viscous Miso model initially falls and adheres to the bottom of the bidet. As the water in the water tank flows out, the water flow flushes the lower part of the viscous Miso model, but due to the use of a high-viscosity material model, the upper part of the viscous Miso model is not completely flushed. It can be seen that after the flushing is completed, the upper part of the viscous Miso model still remains at the bottom of the bidet, and geometrically retains a cylindrical solid-like form.

[0080] The viscous Miso model can realistically simulate the properties of human excrement. By adjusting the kinematic viscosity, yield strength, and plastic viscosity of the viscous Miso model and matching the yield strength parameters, it can further simulate various types of waste. In addition, the viscosity of the viscous Miso model can be set to a larger value to simulate a more severe flushing condition and obtain the ultimate flushing capacity of the toilet.

[0081] S9: According to the applicable scenario of the designed toilet, select the corresponding Miso model to carry out fluid-solid coupling simulation test, and output the structural parameters of the toilet according to the simulation results to guide the structural design or optimization of the toilet.

[0082] When necessary, multiple rounds of optimization and analysis can be performed to gradually achieve the ultimate high-efficiency flushing goal, such as the optimal sewage discharge effect under the same drainage volume, the optimal water consumption under the same sewage discharge effect, etc. When the verification results meet the requirements, the optimal toilet structure parameters are output.

[0083] This embodiment also provides a system for implementing the above method.

[0084] A toilet flushing simulation system comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, any one of the above methods is implemented.

[0085] This embodiment also provides a storage medium storing a computer program capable of implementing the above method.

[0086] A storage medium comprises a memory, wherein a computer program is stored in the memory, and when the computer program is executed by a processor, any of the above methods is implemented.

[0087] This embodiment also provides a product capable of implementing the above method.

[0088] A toilet flushing simulation product includes a computer program, and when the computer program is executed by a processor, any of the above methods is implemented.

[0089] In summary, the present application can quickly establish a fluid simulation model for toilet flushing. By establishing different rigid Miso models, flexible Miso models, and viscous Miso models to match different simulation scenarios, it is possible to quickly verify the flushing capacity of the toilet under different working conditions. Based on the calculation results obtained by simulation, the various structural parameters of the toilet, such as the arc angle and pipe diameter parameters of the jet flow channel, pelvic surface, and sewage flow channel, can be quickly iterated and optimized, which has guiding significance for the water seal height design and the water tank water consumption evaluation. After multiple cycles of iterative optimization design, the optimal toilet structure that meets the design requirements can be obtained, which can speed up the product development progress and reduce the testing cost.

[0090] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A toilet flushing simulation method, characterized in that: The steps include the following steps: S1: Obtain a three-dimensional model of the toilet, perform geometric processing on the three-dimensional model of the toilet, and establish a toilet flushing simulation model, which at least includes the outer contour of the toilet, the inner wall surface of the toilet bowl, the upper surface of the water tank, the bottom of the toilet bowl, and the inner wall surface of the pipe; S2: Determine the material properties of the toilet flushing simulation model, including toilet material properties, fluid material properties, and Miso material properties; S3: Define the action of the water tank outlet valve body according to the flushing condition to ensure that the simulated condition is similar to the actual condition; S4: define the flow inlet and generate the water volume of the water tank and the water seal volume in the initial stage; S5: Perform pure water flow flushing simulation on the toilet flushing simulation model to verify the reliability of the toilet flushing simulation model; S6: According to the Miso material properties, a rigid Miso model is established to perform fluid-solid coupling scour simulation; Define the rigid Miso model as a rigid body, define the rigid body density threshold, and import it into the toilet flushing simulation model. The initial position is defined as above the water seal and at the bottom of the basin. The rigid Miso model is used to simulate the flushing condition of hard foreign bodies. When the generated rigid Miso model falls into the water, it squeezes out part of the water remaining in the original water seal. As the flushing begins, the rigid Miso model interacts with the water flow and is flushed to the sewage outlet under the action of the water flow. By increasing the number of rigid Miso models, the flushing capacity of the toilet is further tested. S7: According to the Miso material properties, a flexible Miso model is established to perform fluid-solid coupling scour simulation; In step S7, the flexible Miso model is defined as a flexible body, allowing the flexible Miso model to produce flexible deformation, and at the same time, the force condition of the flexible Miso model is obtained to analyze the wear condition of the inner wall surface of the bidet or the inner wall surface of the pipe; A Wall file is generated based on the flexible Miso model for coupling the multi-body system finite element method with the moving particle fluid analysis method. The flexible Miso model file is imported into the toilet fluid simulation model to build a collaborative simulation model between the two calculation methods. The position and velocity information is transmitted to the fluid through the Wall file, and the reaction force of the fluid is then transmitted back to the multi-body dynamics model for calculation. After the generated flexible Miso model falls into the water, it interacts with the fluid and changes the flow field state. As the flushing begins, the force generated by the water flow increases, the flexible Miso model deforms, collides with the inner wall of the basin and the inner wall of the pipe, and is finally flushed out by the water flow. S8: According to the Miso material properties, a viscous Miso model is established to perform fluid-solid coupling scour simulation; In step S8, the crushing effect and the dispersion effect of the viscous Miso model are realized by a non-Newtonian fluid model, and the viscous Miso model is defined as a Bingham fluid, which is characterized by a slightly rigid high-viscosity fluid before the shear stress of the fluid reaches a specified value, and a viscoplastic fluid when the shear stress exceeds the specified value; For a Bingham fluid, its apparent viscosity is: ； in, is the yield criterion for the Bingham fluid state and the rigid state, is the yield strength, is the average shear velocity, is the plastic viscosity, is the yield coefficient; In the case of the low-viscosity viscous Miso model, the viscous Miso model does not adhere much to the inner wall of the basin or the flow channel wall. Under the action of the water flow, the viscous Miso model is quickly dispersed by the water flow. Since the viscous Miso model is dispersed by the water flow in the early stage of flushing, part of the viscous Miso model swirls at the bottom of the basin and is not carried out by the water flow. In the high-viscosity viscous Miso model, the viscous Miso model initially falls and adheres to the bottom of the bidet. As the water in the water tank flows out, the water flow flushes the lower part of the viscous Miso model, but the upper part of the viscous Miso model is not completely flushed. After the flushing is completed, the upper part of the viscous Miso model still stays at the bottom of the bidet, and geometrically retains a cylindrical solid-like form. S9: According to the applicable scenario of the designed toilet, select the corresponding Miso model to carry out fluid-solid coupling simulation test, and output the structural parameters of the toilet according to the simulation results to guide the structural design or optimization of the toilet.

2. A toilet flushing simulation method according to claim 1, characterized in that: The MPS method is used to perform geometric processing on the three-dimensional model of the toilet. There is no need to mesh the three-dimensional model of the toilet, and only the outer contour of the toilet is retained.

3. A toilet flushing simulation method as claimed in claim 1, characterized in that: In step S2, the material property of the toilet is set to ceramic texture, which is defined as a Polygon property, with a Young's modulus of 100 GPa, and the fluid is defined as a Fluid property. Water at 20°C is used as the fluid, with a density of 1000 kg / m 3 , viscosity 1*10 -6 m 2 / s, surface tension coefficient 0.072N / m, and the material properties of Miso, that is, the artificial specimen of bean paste, are set to be a cylinder with a length of 100mm and a diameter of 25mm, a weight of about 50g and a soft texture.

4. A toilet flushing simulation method according to claim 1, characterized in that: In step S3, the action of the water tank outlet valve is defined according to the single flushing water volume requirement. In order to ensure the stability of the solution process, the water valve is closed in the initial stage. After the fluid is generated and stabilized, the water valve is opened. After the water tank releases the required amount of water, the water valve is retracted and the water discharge stops.

5. A toilet flushing simulation method as claimed in claim 1, characterized in that: In step S5, in order to verify the reliability of the toilet flushing simulation model, a pure water flushing simulation is first performed without introducing the Miso model, and the particle reference size is selected using the following formula (1): the particle diameter is roughly selected to be one-third of the minimum pipe diameter in the flow channel, and the particle distribution coefficient is calculated. If it is satisfied, the particle reference size is selected appropriately; if it is not satisfied, the particle reference size is recalculated; （1）； in, is the minimum diameter of the flow channel, To calculate the basin volume, is the number of cores of the computing device, is the coarse particle diameter, is the scaling factor, which is related to the fluid properties.

6. A toilet flushing simulation system, comprising a memory and a processor, wherein a computer program is stored in the memory, characterized in that: When the computer program is executed by the processor, the method according to any one of claims 1 to 5 is implemented.

7. A storage medium, comprising a memory, wherein a computer program is stored in the memory, wherein: When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

8. A toilet flushing simulation product, comprising a computer program, characterized in that: When the computer program is executed by a processor, the method described in any one of claims 1 to 5 is implemented.

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