Design method for optimizing waterscape in landscape project based on CFD

Abstract

The invention relates to the technical field of waterscape design, in particular to a design method for optimizing waterscape in a landscape project based on CFD (computational fluid dynamics), which comprises the following steps: acquiring waterscape coverage area and terrain information, site climate and season information, biological type information and social culture background information, and determining the trend and setting of a waterway; constructing a model based on the trend and scenery of the water channel, and exporting a model file; decomposing a calculation area of the water channel into discrete grids based on the model file, and adopting refined grids at a large gradient variable position; specifying a boundary condition based on the discrete grid, and solving an equation at the discrete grid; the method comprises the following steps: simulating a water flow form, observing the water flow form, adjusting a model file and solving an equation again through computational fluid dynamics (CFD) simulation, and when the simulated water flow form, water channel trend and setting meet requirements, exporting a model finalizing file and designing a drawing. The invention aims to accurately grasp the water flow form of the waterscape and meet the design requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of waterscape design, and in particular to a design method for optimizing waterscape in a landscape project based on CFD. Background Art

[0002] As an active factor in urban landscape construction, waterscape plays an important role. Waterscape is the product of the combination of engineering technology and artistic design. Modern landscape design concepts and their design and technical methods have brought unprecedented changes to the development of waterscape. The most important manifestation is the development of design concepts, which are currently mostly in an extensive development state. At the same time, waterscape design has always remained at the subjective level of perception, emphasizing inspirational design methods, and favoring art over science.

[0003] In the related technology, in the design of waterscape, the user's needs and intentions are the core, and the waterscape is based on the waterway layout and the landscape surrounding the waterway. The user's design needs are met through these subjects. As for the speed of water flow, the position and state of water splashes, the corresponding drop and the structure inside the waterway are designed directly according to experience when designing the waterway. This results in a beautiful shape of the waterway, but after actual completion, there are problems such as water flow accidentally splashing out of the waterway and the state of water splashes being difficult to meet the needs at the designated location. Summary of the invention

[0004] The main purpose of the present invention is to provide a design method for optimizing waterscape in landscape projects based on CFD, aiming to accurately grasp the water flow morphology of the waterscape and meet the design requirements.

[0005] To achieve the above object, the present invention proposes a design method for optimizing waterscape in landscape projects based on CFD, comprising the following steps:

[0006] S100, obtaining waterscape coverage area and terrain information, site climate and season information, biological type information, and social and cultural background information, and determining the trend and layout of the waterway based on the above information;

[0007] S200, build an initial model based on the trend and layout of the waterway, back up and save the initial model, and export the model file;

[0008] S300, decomposes the computational domain of the waterway into discrete grids based on the model file, uses fine grids at locations with large gradient variables, and uses coarse grids for the rest of the grids;

[0009] S400, specifying an inlet boundary condition, an outlet boundary condition, a solid wall boundary condition, a symmetric boundary condition, and a periodic boundary condition based on a discrete grid, and solving equations at the discrete grid;

[0010] S500 simulates water flow patterns through computational fluid dynamics (CFD) simulation, observes water flow patterns, adjusts model files, and re-solves equations. When the simulated water flow patterns, waterway trends, and scenery meet the requirements, the model finalization file is exported and designed into drawings.

[0011] In one embodiment of the present application, after step S100, the following steps are further included:

[0012] S101, based on the user's design requirements, the flow area of ​​the waterway and the scenery are divided into different design subjects;

[0013] S102, based on different design subjects, uses the changes in water potential and water volume in the waterway as the basis for switching themes.

[0014] In an embodiment of the present application, after step S200, the method further includes:

[0015] S201, while backing up and saving the model file, the specific bending angle, number of bends, slope, and structural features of the waterway in the model file are synchronously filled in a table and stored together with the model file.

[0016] In an embodiment of the present application, after step S300, the method further includes:

[0017] S301, determining the bend position of the waterway, the slope change position, the obstacle position on the bottom of the waterway, and the obstacle position on the side of the waterway based on the model file, and decomposing them using a refined grid;

[0018] S302, based on the model file, determine the area of ​​the waterway where the slope is constant, there are no obstacles, and there are no bends, and decompose it using a coarse grid.

[0019] In an embodiment of the present application, after step S400, the method further includes:

[0020] S410, the solution equation at the discrete grid is based on the NS Navier-Stokes equation, by setting the fluid in the waterscape as an incompressible Newtonian fluid, assuming μ is the viscosity of the fluid, simplifying the NS equation, and obtaining the vector formula of the simplified equation according to inertial force = volume force + pressure difference force + viscosity force Among them, u, v, w are the velocities in the three directions of xyz, and f x f y f z is the physical force in the three directions of x, y and z, p xx p yy p zz τ xy τ xz τ yz is the stress received by the fluid element in all directions.

[0021] In an embodiment of the present application, after step S410, the following steps are further included:

[0022] S420, the vector formula is solved by the method, and the kernel function is used to solve the unknown velocity, pressure, and density in the NS equation, and the approximate expression is obtained as Where W is the kernel function, m j is the particle mass, ρ j is the particle density, h is the smooth length of the kernel function, is the distance between particles i and j, A j is the function value at particle j.

[0023] In one embodiment of the present application, after step S420, the following steps are further included:

[0024] S421, using kernel function discretization to simplify the NS equations of incompressible Newtonian fluid, and obtaining the NS equations after kernel function discretization;

[0025] S422, based on the simplified NS equation, uses the kernel function To express;

[0026] S423, based on the simplified NS equation, uses the kernel function for pressure To express;

[0027] S424, based on the simplified NS equation, uses the kernel function To express.

[0028] In an embodiment of the present application, after step S500, the following steps are further included:

[0029] S501, based on the NS equation, the particle method of LS-DYNA is used to calculate and generate water flow effects;

[0030] S502, scoring the water flow special effects based on user needs and the scenery on both sides of the waterway, and synchronously saving the water flow state and the model file;

[0031] S503, when the score is not enough, readjust the model file and generate a new water flow state for re-scoring;

[0032] S504, when the score is sufficient, export the model finalization file and design it into construction drawings.

[0033] To achieve the above object, the present invention proposes a design system for optimizing waterscape in landscape projects based on CFD, including the above-mentioned design method for optimizing waterscape in landscape projects based on CFD. The design system for optimizing waterscape in landscape projects based on CFD includes:

[0034] In one embodiment of the present application, the design system for optimizing waterscape in landscape projects based on CFD is applied to the design method for optimizing waterscape in landscape projects based on CFD, and the system includes:

[0035] A data collection module, which is used to back up and save the model file, and to attach specific bending angles, number of bends, slope, and structural features of the waterway to the file;

[0036] A data supplement module, wherein the data supplement module is used to save corresponding water flow effects by comparing with the model file;

[0037] A feature extraction module, wherein the feature extraction module obtains the position information of the water splash relative to the water body, the height information of the water splash, and the water flow intensity information according to the water flow special effect, extracts the feature information and feature keywords, and saves them in the corresponding model file;

[0038] The model adjustment module is used to pre-input water flow feature keywords when constructing / adjusting the model, and compare them with the feature information and feature keywords stored in the system to export the model file with higher similarity and its corresponding parameters.

[0039] The technical solution of the present invention adopts the method of collecting environmental factors of the waterscape step area before constructing the design drawings, and first customizes the waterscape as a design subject in combination with the needs of the user, and confirms the trend of the waterway and the scenery on both sides of the waterway. After the preliminary design is completed, the brave modeling software models the initial design and exports the model file. At the same time, the model file together with its features needs to be backed up and saved for optimizing the design system, improving the subsequent construction and optimization efficiency of the waterscape, and can also be used for review and summary after the design is completed to improve the design effect. The calculation area of ​​the model file is decomposed. In order to improve the calculation accuracy and reduce the calculation burden, the large gradient variable position of the waterway in the model file is refined. The coarse grid is used for the rest. After the grid division is completed, the boundary conditions of the grid are specified. The inlet boundary condition is to specify where the fluid enters the calculation area, usually including the velocity, pressure, temperature, etc. of the fluid; the outlet boundary condition is to define which parts of the calculation area the fluid leaves, usually specifying the pressure, velocity and other parameters at the outlet; the solid wall boundary condition is used to describe the interaction between the fluid and the surface of the solid object. The symmetric boundary condition is to assume that the physical quantities of the fluid in a specific direction are symmetrical on the symmetry plane, thereby simplifying the calculation area and reducing the amount of space that needs to be modeled. The periodic boundary condition is used to simulate periodic repeated flow phenomena, such as periodic flow in a pipe, where the flow at one port is the same as the flow at another port. Through the above boundary conditions, the data required for simulating the water flow morphology is calculated and the amount of calculation is simplified. After the above data calculation is completed, the water flow morphology is simulated based on computational fluid dynamics (CFD). If the water flow morphology meets the design requirements, it can be recorded as a pending model, and the model file can be adjusted according to the requirements, and the final water flow morphology simulation is generated according to the above steps. The design that does not meet the requirements will not be recorded as a pending model. The pending model will be compared and screened, and the final version will be confirmed. The model finalization file can be directly exported and designed into a drawing. The waterscape model is used to guide manufacturers in production and on-site real-time. Through the above methods, the water flow morphology of the waterscape can be accurately grasped, the design efficiency can be improved, and the design requirements can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0041] Figure 1 A flow chart of a design method for optimizing waterscape in a landscape project based on CFD according to the present invention;

[0042] Figure 2 A schematic diagram of the W kernel function of the design method for optimizing waterscape in landscape projects based on CFD according to the present invention;

[0043] Figure 3 A preliminary design flow chart of a design method for optimizing waterscape in landscape projects based on CFD according to the present invention;

[0044] Figure 4 A storage flow chart of a design method for optimizing waterscape in a landscape project based on CFD according to the present invention;

[0045] Figure 5 It is a decomposition flow chart of the design method for optimizing waterscape in landscape projects based on CFD of the present invention;

[0046] Figure 6 The finalized flow chart of the design method for optimizing waterscape in landscape projects based on CFD of the present invention;

[0047] Figure 7 It is a structural schematic diagram of a design system for optimizing waterscape in landscape projects based on CFD according to the present invention.

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] To solve the problems in the background technology, such as Figures 1 to 6 As shown, the present invention proposes a design method for optimizing waterscape in landscape projects based on CFD, comprising the following steps:

[0051] S100, obtaining waterscape coverage area and terrain information, site climate and season information, biological type information, and social and cultural background information, and determining the trend and layout of the waterway based on the above information;

[0052] S200, build an initial model based on the trend and layout of the waterway, back up and save the initial model, and export the model file;

[0053] S300, decomposes the computational domain of the waterway into discrete grids based on the model file, uses fine grids at locations with large gradient variables, and uses coarse grids for the rest of the grids;

[0054] S400, specifying an inlet boundary condition, an outlet boundary condition, a solid wall boundary condition, a symmetric boundary condition, and a periodic boundary condition based on a discrete grid, and solving equations at the discrete grid;

[0055] S500 simulates water flow patterns through computational fluid dynamics (CFD) simulation, observes water flow patterns, adjusts model files, and re-solves equations. When the simulated water flow patterns, waterway trends, and scenery meet the requirements, the model finalization file is exported and designed into drawings.

[0056] Understandably, before constructing the design drawings, it is preferred to collect environmental factors of the waterscape step area, and first customize the waterscape as a design subject in combination with the user's needs, and confirm the trend of the waterway and the scenery on both sides of the waterway. After the preliminary design is completed, the brave modeling software models the initial design and exports the model file. At the same time, the model file and its features need to be backed up and saved to optimize the design system and improve the subsequent construction and optimization efficiency of the waterscape. It can also be used for review and summary after the design is completed to improve the design effect. The calculation area of ​​the model file is decomposed. In order to improve the calculation accuracy and reduce the calculation burden, a refined grid is used for the large gradient variable position of the waterway in the model file, and a coarse grid is used for the rest. After the meshing is completed, the boundary conditions of the mesh are specified. The inlet boundary condition specifies where the fluid enters the calculation area, usually including the velocity, pressure, temperature, etc. of the fluid; the outlet boundary condition defines which parts of the calculation area the fluid leaves, usually specifying parameters such as pressure and velocity at the outlet; the solid wall boundary condition is used to describe the interaction between the fluid and the surface of the solid object. This Including how the velocity, pressure and temperature of the fluid are affected by the wall; the symmetric boundary condition assumes that the physical quantities in a specific direction of the fluid are symmetrical on the symmetry plane, thereby simplifying the calculation area and reducing the amount of space that needs to be modeled; periodic boundary conditions are used to simulate periodically repeated flow phenomena, such as periodic flow in a pipe, where the flow at one port is the same as the flow at another port. Through the above boundary conditions, the data required to simulate the water flow morphology is calculated and the amount of calculation is simplified. After the above data calculation is completed, the water flow morphology is simulated based on computational fluid dynamics (CFD). If the water flow morphology meets the design requirements, it can be recorded as a pending model, and the model file can be adjusted according to the requirements, and the final water flow morphology simulation is generated again according to the above steps. The design that does not meet the requirements will not be recorded as a pending model. The pending model will be compared and screened, and the final version will be confirmed. The model finalization file can be directly exported and designed into a drawing. The waterscape model is used to guide manufacturers in production and on-site real-time. Through the above methods, the water flow morphology of the waterscape can be accurately grasped, the design efficiency can be improved, and the design requirements can be met.

[0057] S101, based on the user's design requirements, the area through which the waterway flows and the scenery are divided into different design subjects.

[0058] Understandably, in addition to designing the waterscape as a whole with the same set of design concepts, multiple design concepts can be adopted in the process of designing a waterscape according to customer needs. For example, spring, summer, autumn and winter can be described by using different characteristics such as different intensities of water flow and width of waterways, and combined with the scenery beside the waterways to divide it into multiple different design entities.

[0059] S102, based on different design subjects, uses the changes in water potential and water volume in the waterway as the basis for switching themes.

[0060] It is understandable that different design subjects need to have different scenery and expressions. When switching subjects, in order to give users a better experience, different design subjects can change the inclination slope and width of the waterway when switching, so that the water potential and water volume change, bringing users a better experience.

[0061] S201, while backing up and saving the model file, the specific bending angle, number of bends, slope, and structural features of the waterway in the model file are synchronously filled in a table and stored together with the model file.

[0062] Understandably, after the preliminary design / modification of the model file is completed, the model file needs to be backed up and saved again. Similarly, in addition to the model file, the specific bending angle, number of bends, slope, waterway structure and other features of the waterway also need to be described in text and saved together with the specific parameters and the model file. The purpose of this is to have a reference file when designing / modifying the model next time. The features can be used as keywords. When the next design idea is obtained, the keywords can be selected and sorted out, and the previous designs can be retrieved by keyword. The general design can be referred to to view the water flow simulation effect of the waterscape, which can play an auxiliary optimization role for the subsequent design.

[0063] S301, based on the model file, determine the bend position of the waterway, the slope change position, the obstacle position of the waterway bottom, and the obstacle position of the waterway side, and decompose them using a refined grid.

[0064] Understandably, after the model file is confirmed, the 3D model of the waterscape can be constructed through 3D modeling software such as Rhino and SketchUp, and they can be exported. In order to simulate the water flow state under the waterscape, the waterway needs to be split and calculated, and the bending position of the waterway, the slope change position, the obstacle position on the bottom of the waterway, the obstacle position on the side of the waterway, etc. are all positions where the water flow will violently collide with the waterway to produce turns and splashes. The data in this area changes violently, and a refined network needs to be used for detailed calculations to avoid distortion in the simulation.

[0065] S302, based on the model file, determine the area of ​​the waterway where the slope is constant, there are no obstacles, and there are no bends, and decompose it using a coarse grid.

[0066] It can be understood that in areas where the waterway slope is constant, there are no obstacles or bends, and other similar locations, the water flow can evenly contact the side walls and bottom of the waterway when moving, and will not produce excessive changes. There is no need to use a refined grid. Using a coarse grid can save calculation amount, improve the calculation speed, and will not distort the model.

[0067] S410, solve the equations at the discrete grid, based on the NS Navier-Stokes equations, by setting the fluid in the waterscape as an incompressible Newtonian fluid, assuming μ is the viscosity of the fluid, simplifying the NS equations, and according to inertia force = volume force + pressure difference force + viscosity force, the vector formula of the simplified equation is obtained Among them, u, v, w are the velocities in the three directions of xyz, and f x f y f z is the physical force in the three directions of x, y and z, p xx p yy p zz τ xy τ xz τ yz is the stress received by the fluid element in all directions.

[0068] It can be understood that in this design method, in order to simulate the water flow more realistically and reasonably, the core of the method adopts the NS Navier-Stokes equations.

[0069]

[0070] This equation can set the fluid as an incompressible Newtonian fluid, μ is the viscosity of the fluid, and the above NS equation can be simplified to

[0071]

[0072] According to inertial force = volume force + pressure difference force + viscous force, we can get the vector form of the simplified equation:

[0073] S420, the vector formula is solved by the method, and the kernel function is used to solve the unknown velocity, pressure, and density in the NS equation, and the approximate expression is obtained as Where W is the kernel function, m j is the particle mass, ρ j is the particle density, h is the smooth length of the kernel function, is the distance between particles i and j, A j is the function value at particle j.

[0074] It can be understood that the smooth particle method is used to solve the above equations, and the NS equations are discretized using kernel functions. According to the kernel function theory, any function such as the unknown quantity (speed, pressure, density, etc.) A(r) in the NS equation can be approximately expressed as The function value of function A(r) at any particle is equal to the weighted sum of the function value at all particles around the particle (the spherical area with a radius of h) and the kernel function value. Figure 2 As shown, the total number of particles in the circular area covered by the kernel function at particle i is N, and the function value A(ri) at particle i is equal to the weighted sum of the function values ​​at these N particles and the kernel function value.

[0075]

[0076] The kernel function W is bell-shaped and is solved using a two-dimensional normal distribution probability density function. The selected kernel function is bell-shaped and satisfies the following conditions: first, when h in the kernel function approaches 0, the kernel function approaches the Dirac function; second, the kernel function satisfies orthogonality

[0077]

[0078] Various derivatives of the kernel function of function A(r) after discretization

[0079]

[0080] The NS equations of incompressible Newtonian fluid are simplified by using kernel function discretization, and the NS equations after kernel function discretization are obtained.

[0081]

[0082] S421, using kernel function discretization to simplify the NS equations of incompressible Newtonian fluid, and obtaining the NS equations after kernel function discretization;

[0083] S422, based on the simplified NS equation, uses the kernel function To express;

[0084] S423, based on the simplified NS equation, uses the kernel function for pressure To express;

[0085] S424, based on the simplified NS equation, uses the kernel function To express.

[0086] It can be understood that after the above calculations, each unknown quantity in the NS equation can select a corresponding kernel function. Through these kernel functions, the solution domain is discretized into a large number of particles, and the density of each particle is updated according to the first kernel function discrete equation, and the pressure of each particle is updated according to the state equation. Then, each external force in the second kernel function discrete equation is calculated, and finally the velocity is updated, and then the displacement is updated. At the same time, it is necessary to process the particles that touch the boundary to prevent the particles from penetrating the boundary and directly change the velocity direction of the particles that touch the boundary. This process continues to advance to obtain the particle distribution at each moment.

[0087] S501, based on the NS equation, uses the LS-DYNA particle method to perform calculations and generate water flow effects.

[0088] It can be understood that after obtaining the above results, the particle method of LS-DYNA can be used to calculate and build an accurate water flow simulation model in combination with particle distribution.

[0089] S502, based on user needs and the scenery on both sides of the waterway, the water flow special effects are scored, and the water flow status and model file are saved synchronously.

[0090] Understandably, once the construction of a waterscape project begins, its modification and reconstruction will be very time-consuming and labor-intensive. Therefore, in order to ensure that there are no mistakes in the design, it is necessary to design multiple sets of waterscape model files, and each set needs to be saved and water flow special effects generated. After each special effect is generated, it can be saved synchronously with the model file, and manual judgment can be made to detect whether the waterway, water flow, and waterscape are harmonious and natural, whether the waterscape meets the design requirements, and score them.

[0091] S503, when the score is not enough, readjust the model file and generate a new water flow state for re-scoring.

[0092] Understandably, when the score is too low, it means that the design plan is unreasonable and cannot be used. It also needs to be saved and recorded in the database so that it can be used to avoid pitfalls and improve design effects in the future.

[0093] S504, when the score is sufficient, export the model finalization file and design it into construction drawings.

[0094] Understandably, when the score is sufficient, it can be left as a pending project. After obtaining multiple reasonable models, it can be screened again so that the design can meet the needs of multiple parties. After it is fully finalized, the final CAD file can be exported and the drawing design can be completed. The waterscape model in the drawing can guide the manufacturer to produce and facilitate subsequent on-site construction.

[0095] Reference Figure 7As shown, the present invention further proposes a design system for optimizing waterscape in landscape projects based on CFD, and the design system for optimizing waterscape in landscape projects based on CFD includes the above-mentioned design method for optimizing waterscape in landscape projects based on CFD. The specific structure of the design method for optimizing waterscape in landscape projects based on CFD refers to the above-mentioned embodiment. Since the design system for optimizing waterscape in landscape projects based on CFD adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0096] The design system for optimizing waterscape in landscape projects based on CFD proposed by the present invention comprises a data collection module, a data supplement module, a feature extraction module and a model adjustment module. The data collection module is used to back up and save the model file, and to attach specific bending angles, bending numbers, slopes and structural features of the waterway to the file; the data supplement module is used to save the corresponding water flow special effects by comparing with the model file; the feature extraction module obtains the position information of the water splash relative to the water body, the water splash height information and the water flow intensity information according to the water flow special effects, extracts the feature information and feature keywords, and saves them in the corresponding model file; the model adjustment module is used to pre-input the water flow feature keywords when constructing / adjusting the model, and compares them with the feature information and feature keywords saved in the system, and derives the model file and its corresponding parameters with high similarity.

[0097] Understandably, the existence of this design system is to improve design efficiency and quality. By retaining the corresponding design ideas, technical indicators, and descriptions and pictures of the completed effects during each design / modification, before designing the waterscape, the design theme and design keywords can be predetermined based on user needs and design concepts. By performing relevance screening on keywords and themes in the database, similar results can be obtained. By checking the status of the waterscape and the form of the waterway, reference ideas can be provided for subsequent designs, which can reduce detours encountered during design and improve design efficiency and effects. Through the above methods and systems, the water flow form of the waterscape can be accurately grasped to meet design needs.

[0098] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0099] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A design method for optimizing waterscape in landscape projects based on CFD, characterized in that: The following steps are involved: S100, obtaining waterscape coverage area and terrain information, site climate and season information, biological type information, and social and cultural background information, and determining the trend and layout of the waterway based on the above information; S200, build an initial model based on the trend and layout of the waterway, back up and save the initial model, and export the model file; S300, decomposes the computational domain of the waterway into discrete grids based on the model file, uses fine grids at locations with large gradient variables, and uses coarse grids for the rest of the grids; S400, specifying an inlet boundary condition, an outlet boundary condition, a solid wall boundary condition, a symmetric boundary condition, and a periodic boundary condition based on a discrete grid, and solving equations at the discrete grid; S500 simulates water flow patterns through computational fluid dynamics (CFD) simulation, observes water flow patterns, adjusts model files, and re-solves equations. When the simulated water flow patterns, waterway trends, and scenery meet the requirements, the model finalization file is exported and designed into drawings.

2. A design method for optimizing waterscape in landscape projects based on CFD according to claim 1, characterized in that: After step S100, the method further includes: S101, based on the user's design requirements, the flow area of ​​the waterway and the scenery are divided into different design subjects; S102, based on different design subjects, uses the changes in water potential and water volume in the waterway as the basis for switching themes.

3. A design method for optimizing waterscape in landscape projects based on CFD according to claim 2, characterized in that: After step S200, the method further includes: S201, while backing up and saving the model file, the specific bending angle, number of bends, slope, and structural features of the waterway in the model file are synchronously filled in a table and stored together with the model file.

4. The design method for optimizing waterscape in landscape projects based on CFD according to claim 3 is characterized in that: After step S300, the method further includes: S301, determining the bend position of the waterway, the slope change position, the obstacle position on the bottom of the waterway, and the obstacle position on the side of the waterway based on the model file, and decomposing them using a refined grid; S302, based on the model file, determine the area of ​​the waterway where the slope is constant, there are no obstacles, and there are no bends, and decompose it using a coarse grid.

5. The design method for optimizing waterscape in landscape projects based on CFD according to claim 4 is characterized in that: After step S400, the method further includes: S410, the solution equation at the discrete grid is based on the NS Navier-Stokes equation, by setting the fluid in the waterscape as an incompressible Newtonian fluid, assuming μ is the viscosity of the fluid, simplifying the NS equation, and obtaining the vector formula of the simplified equation according to inertial force = volume force + pressure difference force + viscosity force Among them, u, v, w are the velocities in the three directions of xyz, and f x f y f z is the physical force in the three directions of x, y and z, p xx p yy p zz τ xy τ xz τ yz is the stress received by the fluid element in all directions.

6. The design method for optimizing waterscape in landscape projects based on CFD according to claim 5 is characterized in that: After step S410, the method further includes: S420, the vector formula is solved by the method, and the kernel function is used to solve the unknown velocity, pressure, and density in the NS equation, and the approximate expression is obtained as Where W is the kernel function, m j is the particle mass, ρ j is the particle density, h is the smooth length of the kernel function, is the distance between particles i and j, A j is the function value at particle j.

7. A design method for optimizing waterscape in landscape projects based on CFD according to claim 6, characterized in that: After step S420, the method further includes: S421, using kernel function discretization to simplify the NS equations of incompressible Newtonian fluid, and obtaining the NS equations after kernel function discretization; S422, based on the simplified NS equation, uses the kernel function To express; S423, based on the simplified NS equation, uses the kernel function for pressure To express; S424, based on the simplified NS equation, uses the kernel function To express.

8. The design method for optimizing waterscape in landscape projects based on CFD according to claim 7, characterized in that: After step S500, the method further includes: S501, based on the NS equation, the particle method of LS-DYNA is used to calculate and generate water flow effects; S502, scoring the water flow special effects based on user needs and the scenery on both sides of the waterway, and synchronously saving the water flow state and the model file; S503, when the score is not enough, readjust the model file and generate a new water flow state for re-scoring; S504, when the score is sufficient, export the model finalization file and design it into construction drawings.

9. A design system for optimizing waterscape in landscape projects based on CFD, comprising a design method for optimizing waterscape in landscape projects based on CFD as claimed in any one of claims 1 to 8, characterized in that: The design system for optimizing waterscape in landscape projects based on CFD includes: A data collection module, which is used to back up and save the model file, and to attach specific bending angles, number of bends, slope, and structural features of the waterway to the file; A data supplement module, wherein the data supplement module is used to save corresponding water flow effects by comparing with the model file; A feature extraction module, wherein the feature extraction module obtains the position information of the water splash relative to the water body, the height information of the water splash, and the water flow intensity information according to the water flow special effect, extracts the feature information and feature keywords, and saves them in the corresponding model file; The model adjustment module is used to pre-input water flow feature keywords when constructing / adjusting the model, and compare them with the feature information and feature keywords stored in the system to export the model file with higher similarity and its corresponding parameters.

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