A design method for a wave-dissipating bank in a pool with a combined porous plate and its wave-dissipating device

Abstract

The present invention relates to the technical field of wave dissipation devices, and discloses a design method for a wave dissipation bank in a pool with a combined perforated plate and its wave dissipation device, including the following steps: measuring the length, width, and water depth of the experimental pool, determining the maximum wavelength and wave steepness range generated by the wave maker, and determining the total length of the wave dissipation device according to the determined length of the inclined perforated plate section and the length of the vertical perforated plate section; arranging the first-layer inclined perforated plate, using a PVC perforated plate with a porosity, a pore diameter, a plate thickness, and an installation angle optimized through experiments within a certain range, with the rear end of the plate body flush with the free liquid surface and the front end immersed to a certain depth. The purpose of this design method for a wave dissipation bank in a pool with a combined perforated plate and its wave dissipation device is to solve the problems in the existing pool wave dissipation technology, such as the wave dissipation bank design being not compact enough, occupying a large amount of pool test length, and having poor absorption efficiency for non-linear large waves.

Description

Technical Field

[0001] The present invention relates to the technical field of wave-dissipating devices, and specifically to a design method for a wave-dissipating bank in a pool with a combined perforated plate and its wave-dissipating device. Background Technique

[0002] With the rapid development of the shipbuilding industry, a large number of physical experimental tests are required in this research field. Wave pools / tanks are essential devices for carrying out the above experiments. During the experiment, when waves are transmitted from the wave-making end of the pool to the end of the pool, wave reflection will occur, which will interfere with the experiment and affect the accuracy of the experiment. Therefore, it is particularly necessary to add a wave-dissipating device at the end of the pool. By adding a wave-dissipating device at the end of the pool, the reflected wave can be effectively reduced, so as to achieve the ability to simulate the open-sea flow field in a closed area and ensure the experimental effect.

[0003] In the existing wave-dissipating technology for pools, the design of the wave-dissipating bank is generally not compact enough, occupying a large amount of valuable pool test length, which limits the effective use space of the pool and affects the flexibility of scientific research and experiments. Secondly, the current design methods mainly focus on the wave-dissipating effect of linear small waves, and there is a lack of effective optimization means for the absorption efficiency of non-linear large waves. This results in a significant reduction in the effectiveness of existing wave-dissipating devices in the face of complex and variable wave conditions in practical applications. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the existing wave-dissipating technology for pools, such as the design of the wave-dissipating bank not being compact enough, occupying a large amount of pool test length, and poor absorption efficiency for non-linear large waves, and to propose a design method for a wave-dissipating bank in a pool with a combined perforated plate and its wave-dissipating device.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A design method for a wave-dissipating bank in a pool with a combined perforated plate includes the following steps:

[0007] S10. Measure the length , width , water depth of the experimental pool, determine the maximum wavelength generated by the wave maker and the wave steepness range, and determine the total length of the wave-dissipating device according to , where the length of the inclined perforated plate section is , and the length of the vertical perforated plate section is ;

[0008] S20. Arrange the first layer of inclined perforated plates, using PVC perforated plates with a porosity , pore diameter , plate thickness , and installation angle It is determined through experimental optimization within the range that the rear end of the plate body is flush with the free liquid surface, and the immersion depth of the front end is ; ;

[0009] S30. Arrange multiple layers of inclined perforated plates, set n candidate values for porosity and n candidate values for plate spacing, conduct combined tests, where n > 2, evaluate the reflection coefficient, and determine the optimal combination of porosity and plate spacing through iterative optimization;

[0010] S40. Arrange vertical perforated plates, with the porosity arranged in decreasing order. The porosity of the first layer is 5, and the porosity of the last layer is , and the porosity of the intermediate layers decreases linearly , where is the total number of layers, the plate spacing is , and the total length is ;

[0011] S50. Optimize the inclination angle of the inclined plate and the porosity sequence of the vertical plate through STARCCM+ numerical simulation to reduce the number of physical experiments. The optimization goal is to reduce the number of ;

[0012] S60. Arrange two wave gauges at a distance of , from the wave-making plate of the wave maker to record the wave surface time history . Use the GODA two-point method to solve the incident wave amplitude and the reflected wave amplitude . The formula is

[0013]

[0014] where is the distance between the two wave gauges, is the phase difference between the wave surface time histories recorded by the two wave gauges, is the wave number, where is the wavelength;

[0015] S70. After obtaining the incident wave amplitude and the reflected wave amplitude, for the non-linear characteristics of the wave, it is necessary to correct the ratio between the incident wave amplitude and the reflected wave amplitude, and introduce a correction factor for the non-linear wave. The wave steepness is defined as the ratio of the wave height to the wavelength, and calculate the final reflection coefficient ;

[0016] S80. Establish a VOF two-phase flow model through STARCCM+, adopt the k-ω SST turbulence model, and the grid size is to verify the wave dissipation effect, verify the ratio between the incident wave amplitude and the reflected wave amplitude, and conduct optimization and improvement.

[0017] Based on the above technical solutions, the present invention can be further improved as follows.

[0018] Furthermore, the distance between the installation position of the wave-dissipating device in step S10 and the wave-making board is set to .

[0019] Furthermore, the installation angle of the inclined perforated plate in step S20 The optimization process is through experimental testing, with a test step of 2°, gradually adjust and measure the reflection coefficient, and finally select the value with the lowest reflection coefficient as the optimal installation angle.

[0020] Furthermore, the phase difference in step S60 is calculated by Fourier analysis and satisfies the dispersion relation , where is the circular frequency, is the acceleration due to gravity, is the wave number, is the water depth.

[0021] A wave-dissipating device in a pool with a combined perforated plate, the wave-dissipating device comprising:

[0022] The first side plates, two in number and arranged in parallel to each other;

[0023] The inclined perforated plates, arranged between the two first side plates, and several in number;

[0024] The second side plates, fixedly installed at the side ends of the first side plates, and the number and distribution positions thereof are adapted to those of the first side plates;

[0025] The vertical perforated plates, arranged between the two second side plates, and perpendicular to the second side plates.

[0026] Furthermore, a plurality of slots are provided on the opposite side surfaces of the two first side plates, and the number of the slots is divided into two equal groups and respectively arranged on the surfaces of the two first side plates, and the inclined perforated plates are connected between the two first side plates by interference fit through the slots.

[0027] Furthermore, the slots are inclined with respect to the horizontal plane, and the inclination angle between the slots and the horizontal plane is between 10° and 20°.

[0028] Furthermore, a plurality of vertically arranged grooves are equally spaced on the opposite side surfaces of the two second side plates, and the vertical perforated plates are connected between the two second side plates by interference fit through the vertically arranged grooves, and the number of the second side plates is several.

[0029] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0030] In view of the problems that the wave-dissipating bank design is not compact enough and occupies a large amount of the test length of the water tank, the total length of the wave-dissipating device is determined by measuring the size of the experimental water tank and the maximum wavelength and wave steepness range generated by the wave maker. This design minimizes the floor area of the wave-dissipating device while ensuring the wave-dissipating effect, thereby increasing the effective test length of the water tank and enhancing the flexibility of scientific research and experiments. Secondly, in view of the problem that the prior art mainly focuses on the wave-dissipating effect of linear small waves and has poor absorption efficiency for non-linear large waves, the present invention adopts a multi-layer combined perforated plate structure, and designs and optimizes parameters such as the porosity, pore diameter, plate thickness, installation angle, and plate spacing of each layer of perforated plate. By adjusting the porosity increasing sequence and plate spacing of the inclined perforated plates, effective wave dissipation for waves of different wavelengths and wave heights, especially non-linear large waves, is achieved. This not only improves the adaptability of the wave-dissipating device to complex wave conditions but also significantly enhances the wave-dissipating efficiency. The inclination angle of the inclined plate and the porosity sequence of the vertical plate are also optimized by the STAR-CCM+ numerical simulation technology, greatly reducing the number of physical experiments, thereby reducing the R & D cost and cycle. At the same time, the GODA two-point method is used to solve the incident wave amplitude and the reflected wave amplitude , and a correction factor is introduced to correct the non-linear wave, making the calculation of the reflection coefficient more accurate and reliable. Finally, a VOF two-phase flow model is established by STAR-CCM+ and the k-ω SST turbulence model is used for numerical simulation, with the grid size refined to , further verifying the actual effect of the wave-dissipating device. It not only solves the problems of design compactness and wave-dissipating efficiency in the prior art but also improves the design efficiency and accuracy by introducing numerical simulation technology, providing a more efficient, reliable, and flexible test environment for physical experiments and scientific research in the ship industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is a schematic structural diagram of a wave-dissipating device in a water tank with a combined perforated plate according to the present invention.

[0032] In the figure: 1, the first side plate; 2, the inclined perforated plate; 3, the second side plate; 4, the vertical perforated plate; 5, the slot; 6, the vertical placement groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts in the embodiments of the present invention belong to the scope of protection of the present invention.

[0034] A method for designing a wave-dissipating bank in a pool with a combined porous plate according to the present invention includes the following steps:

[0035] S10. Measure the length , width , and water depth of the experimental pool, determine the maximum wavelength generated by the wave maker and the range of wave steepness (wave steepness = wave height / wavelength), and determine the total length of the wave-dissipating device according to , where the length of the inclined porous plate section is , and the length of the vertical porous plate section is . In S10, by understanding the basic dimensions and wave characteristics of the pool, a basis is provided for subsequent design to ensure that the total length of the wave-dissipating device matches the pool size and wave characteristics, improving the wave-dissipating effect;

[0036] S20. Arrange the first-layer inclined porous plate, using a PVC porous plate with a porosity , pore diameter , plate thickness , and the installation angle is determined through experiments and optimized within the range of . The rear end of the plate body is flush with the free liquid surface, and the immersion depth of the front end is . In S20, the wave energy is initially dissipated by the inclined porous plate. The inclined porous plate can guide the wave flow direction and dissipate part of the wave energy through the pores, reducing wave reflection;

[0037] S30. Arrange multiple layers of inclined porous plates, set n candidate values for porosity and n candidate values for plate spacing, conduct combined tests, where n > 2, evaluate the reflection coefficient, and determine the optimal combination of porosity and plate spacing through iterative optimization. For example: There are 25 working conditions to be tested for the combination of 5 porosities and 5 plate spacings. Test the results under different schemes, and finally obtain the optimal combination of porosity and plate spacing with the best wave-dissipating effect. In S30, through the combination of multiple layers of inclined porous plates, the wave energy is further dissipated. Through iterative optimization, the optimal combination of porosity and plate spacing is determined, enabling the multiple layers of inclined porous plates to more effectively dissipate the wave energy and reduce the reflection coefficient;

[0038] S40. Arrange the vertical porous plates, with the porosity arranged in a decreasing order. The first layer , the last layer , the middle layer decreases linearly , where is the total number of layers, and the plate spacing , the total length , where in S40, the remaining wave energy is further dissipated through a vertical perforated plate. The vertical perforated plate is arranged with a decreasing porosity, which can better adapt to waves of different wave heights, further reduce the reflection coefficient, and improve the wave dissipation effect;

[0039] S50. Optimize the inclination angle of the inclined plate through STARCCM+ numerical simulation and the porosity sequence of the vertical plate to reduce the number of physical experiments. The optimization goal is to reduce the number of times , and at the same time, the STARCCM+ software is used for numerical simulation to optimize the inclination angle of the inclined perforated plate and the porosity sequence of the vertical perforated plate. According to the size of the experimental pool and the parameters of the perforated plate, a corresponding numerical model is established. By simulating the influence of inclined perforated plates at different angles on waves, at the same time, the dissipation effect of vertical perforated plates with different porosity sequences on waves is simulated. By comparing various combinations, the optimal porosity sequence is determined, that is, arranged from large to small porosity, to minimize wave reflection and re-radiation of energy. Among them, in S50, through numerical simulation technology, the installation angle of the inclined perforated plate and the porosity sequence of the vertical perforated plate are further optimized, reducing the number of physical experiments, shortening the experimental period, and at the same time improving the accuracy and reliability of the design;

[0040] S60. Arrange two wave gauges at the wave-making plate of the wave maker , to record the wave surface time history , and use the GODA two-point method to solve the incident wave amplitude and the reflected wave amplitude , and the formula is

[0041]

[0042] where is the distance between the two wave gauges, is the phase difference between the wave surface time histories recorded by the two wave gauges, is the wave number, where is the wavelength; in the experimental pool, according to the maximum wavelength of the waves generated by the wave-making plate, two wave gauges are arranged at positions and from the wave-making plate respectively. These two wave gauges record the wave surface time histories and , through these two time-course data, the GODA two-point method can be used to calculate the incident wave amplitude and the reflected wave amplitude ;

[0043] Specifically, the GODA two-point method measures the wave surface heights at two different positions and calculates the phase difference and wave number difference between them to solve for the amplitudes of the incident wave and the reflected wave. This method has high precision and reliability and can accurately reflect the propagation and reflection of waves in front of the wave-dissipating bank. Among them, in S60, by measuring and analyzing the wave data, the incident wave amplitude and the reflected wave amplitude are calculated, providing important parameters for evaluating the wave-dissipating effect and also contributing to the correction of nonlinear waves in subsequent steps. Nonlinear waves refer to the wave forms corresponding to a series of nonlinear effects generated when the wave shape changes due to the interaction with the experimental pool during the wave propagation process;

[0044] S70. After obtaining the incident wave amplitude and the reflected wave amplitude, for the nonlinear characteristics of the waves, the ratio between the incident wave amplitude and the reflected wave amplitude needs to be corrected, and a correction factor is introduced for the nonlinear wave. Among them, the wave steepness is defined as the ratio of the wave height to the wavelength, and the final reflection coefficient is calculated. For the nonlinear wave, a correction factor is introduced to calculate the reflection coefficient more accurately. The correction factor is a function of the wave steepness , and its expression is . Among them, the wave steepness is the ratio of the wave amplitude to the wavelength, which reflects the nonlinear degree of the wave. When calculating the reflection coefficient C_r, first use the GODA two-point method to obtain the incident wave amplitude and the reflected wave amplitude , and then substitute these two values into the corrected reflection coefficient formula , by this method, more accurate reflection coefficient values can be obtained, thereby better evaluating the wave dissipation effect of the wave-dissipating breakwater. Among them, in S70, the influence of nonlinear waves is considered to correct the reflection coefficient, improving the calculation accuracy of the reflection coefficient and making the evaluation of the wave dissipation effect more reliable. The reflection coefficient is the ratio of the incident wave amplitude to the reflected wave amplitude. It should also be noted that only by first obtaining accurate incident wave amplitude and reflected wave amplitude through measurement and analysis can the influence of nonlinear waves be further considered to correct the reflection coefficient. In S70, the calculation accuracy of the reflection coefficient is improved, providing a more reliable data basis for the numerical simulation in S80. The nonlinear wave does not directly refer to parameters such as the incident wave amplitude, reflected wave amplitude, and the phase and frequency of the wave, but refers to the wave form that changes due to the interaction with the experimental pool during the wave propagation process, and then a series of nonlinear effects occur. The characteristics of the nonlinear wave lie in the irregularity of its waveform, the asymmetry of its wave height, and the interaction between waves, etc. These are all caused by the influence of various nonlinear factors during the wave propagation process;

[0045] S80. Establish a VOF two-phase flow model through STARCCM+, and adopt the k-ω SST turbulence model. The grid size , verify the ratio between the incident wave amplitude and the reflected wave amplitude for optimization and improvement. To verify the wave dissipation effect of the wave-dissipating breakwater, a VOF two-phase flow model is established again using the STARCCM+ software. In this model, the k-ω SST turbulence model is adopted to describe the turbulence characteristics of the wave. At the same time, to ensure the accuracy of the simulation, a fine grid with a grid size less than or equal to 0.01λ_max is set. By simulating the propagation and reflection process of the wave in front of the wave-dissipating breakwater, the wave height distribution and energy dissipation situation of the wave behind the wave-dissipating breakwater can be obtained. Comparing and analyzing these simulation results with the experimental results can verify whether the wave dissipation effect of the wave-dissipating breakwater meets the design requirements. Among them, in S80, through numerical simulation technology, a VOF two-phase flow model is established to verify the wave dissipation effect, visually display the wave dissipation process, evaluate the wave dissipation effect, and provide a basis for subsequent optimization and improvement. S80 is the process of verifying and applying the corrected reflection coefficient in S70. By establishing a VOF two-phase flow model, the wave dissipation process can be visually displayed and the wave dissipation effect can be evaluated, thereby verifying the effectiveness of the correction factor introduced in S70. The correction result of S70 needs to be verified and applied through S80 to guide the subsequent optimization and improvement work. In summary, first obtain the basic wave data through S60, then consider the nonlinear characteristics for correction through S70, and finally conduct numerical simulation verification and application through S80. This process not only ensures the accuracy of the data but also improves the reliability and practicality of the research.

[0046] Embodiment

[0047] Physical experiment pool:

[0048] Dimensions: 6 meters in length, 0.35 meters in width, and 1.01 meters in height, providing a stable wave environment for experiments.

[0049] Water depth: 0.735 meters, ensuring that the waves have sufficient depth during propagation to exhibit their dynamic characteristics.

[0050] Wave generation range: Wavelength from 0.5 to 2 meters, wave amplitude from 0 to 50 millimeters, covering a wide range of sea wave conditions and facilitating the testing of the performance of the wave-dissipating shore.

[0051] Parameters of the perforated plate:

[0052] Dimensions: 450 millimeters in length, 336 millimeters in width, and 5 millimeters in thickness, ensuring that the perforated plate has sufficient strength and stability.

[0053] Porosity and pore size: According to the experimental requirements, five different perforated plates with different porosities and pore sizes were designed as shown in Table 1 to test their wave energy dissipation effects.

[0054] Table 1 Parameters of the perforated plate

[0055]

[0056] Parameters of the side plates:

[0057] Inclined side plate: 850 millimeters in length, 400 millimeters in width, and 1 centimeter in thickness, designed with inclined convex grooves and an inclination angle of 12°, used to fix the inclined perforated plate and guide the waves.

[0058] Vertical side plate: 765 millimeters in length, 396.4 millimeters in width, and 1 centimeter in thickness, designed with transverse and longitudinal convex grooves, used to fix the vertical perforated plate.

[0059] Design and implementation steps

[0060] Arrangement of the inclined perforated plates:

[0061] The first layer of perforated plate (porosity 0.1) is placed near the free liquid surface, and the front immersion depth is 0.0735 meters to absorb wave energy to the greatest extent.

[0062] Through experimental tests, a perforated plate with a porosity of 0.3 was selected as the second layer and placed 1.5 centimeters away from the first layer of perforated plate to further optimize the wave-dissipating effect.

[0063] The third layer of perforated plate selected a porosity of 0.1 and was placed 5.5 centimeters away from the first layer of perforated plate to further dissipate wave energy.

[0064] Subsequently, multiple layers of inclined perforated plates were added, with the porosity of each layer decreasing successively (two pieces each with porosities of 0.5, 0.4, 0.3, and 0.2), and the plate spacing was 1.5 cm for all layers until the wave-dissipating effect reached the best.

[0065] Arrangement of vertical perforated plates:

[0066] The porosity of the vertical perforated plates is arranged from large to small (ranging from 0.5 to 0.2, with a linear decrease in the intermediate layers), and both the plate spacing and the total length are optimized according to the wave conditions to ensure that the waves can dissipate energy sufficiently when passing through.

[0067] The upper edge of the vertical perforated plate is fixed at 65 mm from the vertical side plate to ensure that the waves can smoothly contact and pass through the perforated plate during propagation.

[0068] Assembly and testing:

[0069] The inclined perforated plates are assembled with the inclined side plates respectively, and the vertical perforated plates are assembled with the vertical side plates respectively, ensuring the structural stability and easy adjustment.

[0070] The assembled wave-dissipating bank is placed in the physical experiment water tank for wave simulation experiments to test its wave-dissipating performance.

[0071] Experimental results and analysis

[0072] Reflection coefficient:

[0073] Reflection coefficient tests were carried out for waves with different wavelengths and wave steepnesses as shown in Table 2. The experimental results show that under the conditions of wave steepnesses of 3% and 9%, the reflection coefficients of each wavelength are relatively low, indicating a significant wave-dissipating effect.

[0074] Especially under the condition of large wave steepness (wave steepness of 9%), the average reflection coefficient is only below 7%, and the corresponding energy absorption efficiency is as high as over 99.28%, fully proving the effectiveness of the design of this wave-dissipating bank.

[0075] Table 2 Wave-dissipating efficiency at different wavelengths

[0076]

[0077] Wave-dissipating principle:

[0078] When the wave is transmitted to the inclined perforated plate, it changes the propagation path and speed of the wave, and consumes the energy of the wave. Considering the water depth and pressure factors, it can be known that when the wave passes through the inclined perforated plate, due to the pores distributed on the perforated plate and the pressure difference between the upper and lower parts of the perforated plate, the wave is deformed and broken, the pressure is reduced, resulting in the loss of wave energy, so as to achieve the purpose of wave dissipation. Since the inclined perforated plate cannot completely consume the wave energy, the broken wave will continue to be transmitted backward to the vertical perforated plate. The porosity of the vertical perforated plate is arranged from large to small. The vertical perforated plate with a large porosity can reduce the wave reflection caused by the direct collision of the wave and allow the wave to pass through. The vertical perforated plate with a small porosity further dissipates the wave energy through the interaction between the wave and the pores to achieve further wave dissipation, and the wave dissipation effect of the nonlinear wave is improved under the interaction of the large wave steepness wave and multiple vertical perforated plates.

[0079] In a preferred embodiment of the present invention, it can be further configured that: the distance between the installation position of the wave dissipation device and the wave-making plate in step S10 is set to , by installing the wave dissipation device at a specified position, it can ensure that the wave has experienced sufficient propagation distance before reaching the wave dissipation device, thus realizing the full development of the wave. The wave may encounter boundaries or obstacles during propagation and generate reflections. Setting the wave dissipation device at a specified position can effectively reduce the interference caused by wave reflection to the wave-making plate and the experimental area, and ensure the accuracy and stability of the experimental results.

[0080] In a preferred embodiment of the present invention, it can be further configured that: the installation angle of the inclined perforated plate in step S20 is optimized through experimental tests, with a test step of 2° , gradually adjust and measure the reflection coefficient, and finally select the value with the lowest reflection coefficient as the optimal installation angle. By precisely adjusting the installation angle of the inclined perforated plate, the wave reflection coefficient is effectively reduced. Experimental tests show that when the value is optimized to the lowest reflection coefficient, the reflection interference encountered by the wave during propagation is significantly reduced. This improvement not only improves the stability of the experimental environment, makes the wave form closer to the natural state, thus enhancing the accuracy and credibility of the experimental results, but also, reducing wave reflection helps to protect the experimental equipment from unnecessary impacts and damages, and extends the service life of the equipment.

[0081] In a preferred embodiment of the present invention, it can be further configured that: the phase difference in step S60 is calculated by Fourier analysis and satisfies the dispersion relation , where is the circular frequency, is the acceleration of gravity, is the wave number, is the water depth. The dispersion relation describes the propagation characteristics of waves at different frequencies and wavelengths. In this formula, and are nonlinearly related through and When the water depth is much greater than the wavelength (i.e., the deep - water case), tends to 1, and the formula simplifies to , which is the dispersion relation of deep - water waves. When the water depth is comparable to or smaller than the wavelength (i.e., the shallow - water case), the value of and significantly affects the relationship between

[0082] A wave - dissipating device in a pool with a combined porous plate, the wave - dissipating device includes:

[0083] The first side plates 1, the number of which is two and are arranged in parallel to each other;

[0084] The inclined porous plates 2, which are arranged between the two first side plates 1, and the number of which is several;

[0085] The second side plates 3, which are fixedly installed at the side ends of the first side plates 1, and the number and distribution positions of which are adapted to the first side plates 1;

[0086] The vertical porous plates 4, which are arranged between the two second side plates 3 and are perpendicular to the second side plates 3.

[0087] The wave - dissipating device includes two parallel first side plates 1, which provide a stable support frame for the whole device. Several inclined porous plates 2 are arranged between the first side plates 1. These inclined porous plates 2 change the propagation path and speed of the waves, and utilize the pore and the pressure difference between the upper and lower parts to deform and break the waves when they come into contact, thereby effectively consuming the wave energy. The inclination angle and porosity of the inclined porous plates 2 are designed through careful calculation and optimization to ensure the best wave - dissipating effect.

[0088] In addition, the wave dissipating device further includes a second side plate 3 fixedly installed at the side end of the first side plate 1. The number and distribution positions of the second side plates 3 are adapted to those of the first side plate 1, and they together form the side walls of the device, providing support for the installation of the vertical perforated plate 4. Between the two second side plates 3, a vertical perforated plate 4 perpendicular to the second side plates 3 is provided. The vertical perforated plate 4 further dissipates wave energy. Through the interaction between the pores and the waves, the wave dissipating effect of the nonlinear waves is enhanced. The porosity and pore size of the vertical perforated plate 4 are also optimized to ensure that the waves can fully dissipate energy when passing through it.

[0089] In a preferred embodiment of the present invention, it can be further configured as follows: as Figure 1 shown; slots 5 are formed on the opposite side surfaces of the two first side plates 1. The number of the slots 5 is set to be several and equally divided into two groups, which are respectively arranged on the surfaces of the two first side plates 1. The inclined perforated plate 2 is connected to the two first side plates 1 by interference fit through the slots 5. The inclined perforated plate 2 no longer relies on the traditional bolt connection or welding method, but realizes the interference connection with the two first side plates 1 through the slots 5. This interference connection method not only simplifies the installation steps and improves the installation efficiency, but also ensures the close fit between the inclined perforated plate 2 and the first side plate 1, effectively preventing loosening or falling off under the impact of waves. During the working process, the waves first contact the inclined perforated plate 2. Since the inclined perforated plate 2 is tightly connected to the first side plate 1 through the slots 5, when the waves hit the inclined perforated plate 2, the wave dissipating characteristics of the porous structure can be fully utilized, and the waves will deform, break and dissipate energy. At the same time, the design of the slots 5 also enhances the stability of the inclined perforated plate 2 under the impact of waves, enabling it to better play the role of wave dissipation.

[0090] In a preferred embodiment of the present invention, it can be further configured as follows: as Figure 1 shown; the slots 5 are inclined with respect to the horizontal plane, and the inclination angle between the slots 5 and the horizontal plane is between 10° and 20°. The design of the inclination angle between 10° and 20° can ensure that the waves receive sufficient resistance when passing through the wave dissipating device, while avoiding the situation that the waves directly cross the inclined perforated plate 2 due to too large an inclination angle and cannot effectively dissipate waves. Therefore, this inclined setting not only improves the wave dissipation efficiency, but also ensures the stability and reliability of the wave dissipating device under various wave conditions.

[0091] In a preferred embodiment of the present invention, it can be further configured as follows: as Figure 1As shown; on the opposite side surfaces of two second side plates 3, a number of vertically arranged slots 6 are equidistantly opened. Among them, the vertical porous plate 4 is press-fitted between the two second side plates 3 through the vertically arranged slots 6. The number of the second side plates 3 is set to be several. Through the press-fitting connection of the vertically arranged slots 6, the vertical porous plate 4 can be stably and tightly installed between the two second side plates 3. This press-fitting connection method not only simplifies the installation steps and improves the installation efficiency, but also ensures the stability of the vertical porous plate 4 under the impact of waves, preventing the reduction of the wave dissipation effect caused by loosening or falling off. The number of the second side plates 3 is set to be several. This design enables the wave dissipation device to be expanded or reduced according to actual needs, so as to adapt to different water environments and wave dissipation requirements. At the same time, the equidistantly opened vertically arranged slots 6 ensure the uniform distribution of the vertical porous plate 4 between the second side plates 3. This not only improves the overall stability of the wave dissipation device, but also enables the waves to receive a more uniform wave dissipation effect when passing through the wave dissipation device. During the working process, the waves first contact the vertical porous plate 4. Since the vertical porous plate 4 is tightly connected to the second side plates 3 through the vertically arranged slots 6, when the waves impact the vertical porous plate 4, the wave dissipation characteristics of the porous structure can be fully utilized, and the waves will deform, break, and dissipate energy. At the same time, the design of the vertically arranged slots 6 also enhances the stability of the vertical porous plate 4 under the impact of waves, enabling it to better play the role of wave dissipation.

[0092] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0093] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for designing a wave-breaking bank in a pool with a combined porous plate, characterized in that: The following steps are involved: S10. Measure the length of the experimental pool ,Width , water depth , determine the maximum wavelength generated by the wave machine and wave steepness range, and according to Determine the total length of the wave-breaking device , where the length of the inclined porous plate section is , the length of the vertical porous plate section is ; S20, arrange the first floor inclined porous plate, using porosity PVC porous plate, pore size , plate thickness , installation angle exist The range is determined by experimental optimization, the rear end of the plate is flush with the free liquid surface, and the front end is immersed in the depth ; S30, arranging multiple layers of inclined porous plates, setting n kinds of porosity and n kinds of plate spacing candidate values, performing combination tests, where n>2, evaluating the reflection coefficient, and determining the best porosity and plate spacing combination through iterative optimization; S40, vertical perforated plates are arranged in descending order of porosity.

5. Last layer , the middle layer decreases linearly ,in is the total number of layers, the board spacing , total length ; S50, Optimization of tilted plate angles through STARCCM+ numerical simulation With vertical plate porosity sequence, the number of physical experiments can be reduced, and the experimental cycle can be reduced ; S60, at the wave-making plate of the wave-making machine , Two wave height meters are arranged at each location to record the wave surface time course. , using the GODA two-point method to solve the incident amplitude and reflected amplitude , the formula is in is the distance between the two wave height meters, is the phase difference between the wave surface time histories recorded by the two wave height meters, is the wave number, where is the wavelength; S70. After obtaining the incident wave amplitude and the reflected wave amplitude, the ratio between the incident wave amplitude and the reflected wave amplitude needs to be corrected according to the nonlinear characteristics of the wave, and a correction factor is introduced for the nonlinear wave. , where the wave steepness Defined as the ratio of wave height to wavelength, the final reflection coefficient is calculated ; S80, establish VOF two-phase flow model through STARCCM+, use k-ωSST model turbulence model, grid size , the ratio between the incident amplitude and the reflected amplitude is verified for optimization and improvement.

2. The method for designing a wave-breaking bank in a pool with a combined porous plate according to claim 1, characterized in that: The distance between the installation position of the wave-breaking device and the wave-making plate in step S10 is set to .

3. The method for designing a wave-breaking bank in a pool with a combined porous plate according to claim 1, characterized in that: The inclined multi-well plate installation angle in step S20 The optimization process is tested experimentally with a test step length of 2°. , gradually adjust and measure the reflection coefficient, and finally select the one with the lowest reflection coefficient value as the optimal installation angle.

4. The method for designing a wave-breaking bank in a pool with a combined porous plate according to claim 1, characterized in that: The phase difference in step S60 Calculated by Fourier analysis and satisfies the dispersion relation ,in is the circular frequency, is the acceleration due to gravity, is the wave number, For water depth.

5. A wave-breaking device designed according to the method for designing a wave-breaking bank in a pool with a combined porous plate according to any one of claims 1 to 4, characterized in that: The wave-breaking device comprises: Two first side plates (1) are arranged parallel to each other; An inclined porous plate (2) is arranged between the two first side plates (1), and a plurality of inclined porous plates are provided; The second side panels (3) are fixedly mounted on the side ends of the first side panels (1), and the number and distribution positions of the second side panels (3) are compatible with those of the first side panels (1); The vertical porous plate (4) is arranged between the two second side plates (3), and is arranged perpendicular to the second side plates (3).

6. A wave-breaking device in a pool with a combined porous plate according to claim 5, characterized in that: Slots (5) are provided on surfaces of opposite sides of the two first side plates (1), wherein the number of the slots (5) is set to be equal and divided into two groups, which are respectively arranged on the surfaces of the two first side plates (1); the inclined porous plate (2) is interference-connected between the two first side plates (1) via the slots (5).

7. A wave-breaking device in a pool with a combined porous plate according to claim 6, characterized in that: The slot (5) is arranged at an inclination with respect to the horizontal plane, wherein the inclination angle between the slot (5) and the horizontal plane is between 10° and 20°.

8. The wave-breaking device in a pool with a combined porous plate according to claim 5, characterized in that: A plurality of vertical placement grooves (6) are provided at equal intervals on the surfaces of one side opposite to the two second side plates (3), wherein the vertical porous plate (4) is interference-connected between the two second side plates (3) via the vertical placement grooves (6), wherein the number of the second side plates (3) is set to be a plurality.

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