CN113742820B - Numerical simulation method for analyzing energy dissipation effect of flood diversion tunnel outlet stilling pool - Google Patents
Numerical simulation method for analyzing energy dissipation effect of flood diversion tunnel outlet stilling pool Download PDFInfo
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Abstract
The invention discloses a numerical simulation method for analyzing the energy dissipation effect of a flood diversion tunnel outlet stilling pool, which comprises the steps of firstly collecting building design data of the flood diversion tunnel outlet section, stilling pool, guard, sea water and the like, establishing a two-dimensional mathematical model of the stilling pool and a downstream local river by mike21 software according to the collected relevant design data of the flood diversion tunnel outlet section, stilling pool, guard, sea water and the like, wherein the model grid type adopts unstructured grids, and the grid size is subjected to regional encryption according to stilling Chi Tixing. The method has the advantages that the energy dissipation effect of the absorption basin under different body types is simulated and calculated by using the two-dimensional mathematical model of the absorption basin built by mike21 software, the modeling is simple, the calculation speed is high, the defects that the modeling and the modification of the traditional physical model test are time-consuming and labor-consuming, the data measurement accuracy is influenced by manual operation and a measuring instrument are avoided, the working efficiency of the model test is improved, the working cost is reduced, and the result can provide scientific basis for the optimization design of the absorption basin.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering flood discharge, and particularly relates to a numerical simulation method for analyzing energy dissipation effects of a flood diversion tunnel outlet stilling pool.
Background
Some cities are located in the surrounding backcross, in rainy season, flood and mountain floods are converged rapidly, after the mountain floods in the river basin flow through the downstream plain area, the mountain floods are converged with the flood in the plain area, the mountain floods are discharged into a main river channel or sea through a flood drainage river channel and a sluice gate, along with the continuous development of the cities, the requirements for flood control and flood drainage are also continuously increased, and a new urban flood control system needs to be constructed for guaranteeing urban flood control and flood drainage safety.
At present, a plurality of cities are constructed by flood diversion tunnels to relieve urban flood control and drainage pressure, and the head difference between the upstream and downstream of some flood diversion tunnels is large, the length of the tunnels is limited, so that the flood discharge water flow ratio is reduced greatly, the flow speed is high, the hydraulic condition is complex, and the energy dissipation and anti-flushing problem of the downstream outlet is outstanding. Due to geographical constraints, the downstream outlets mostly employ underflow energy dissipation. In order to design a stilling pool with reasonable body type and excellent stilling effect, the stilling pool is required to be matched with a model test for verification and optimization analysis. At present, a physical model test is utilized to judge the flow state and the energy dissipation effect of the water flow of the stilling basin relatively intuitively, but the physical model has a relatively long building period and needs to consume relatively high cost, and particularly when the body type is required to be modified, the problems of time and cost are particularly remarkable.
Disclosure of Invention
(1) Technical problem to be solved
Physical model tests are mostly adopted in the study of the energy dissipation effect of the absorption basin, and as the energy of water flow in the absorption basin area is large, the movement change of the water flow in the basin is severe, and the data measurement accuracy is greatly influenced by manual operation and a measuring instrument; on the other hand, the physical model test modification optimization process is time-consuming and labor-consuming, and the working cost is increased.
(2) Technical proposal
In order to solve the technical problems, the invention provides a numerical simulation method for analyzing the energy dissipation effect of a flood diversion tunnel outlet stilling pool, which comprises the following steps:
step 1: collecting design data of the planes and sections of buildings of an outlet section, a stilling pool, a guard, and a sea flood diversion tunnel, flood discharge data of the flood diversion tunnel and section type related data of a downstream river channel connecting section;
step 2: establishing a two-dimensional mathematical model according to the collected flood diversion tunnel outlet section, the stilling pool, the guard, the sea diffusion and the downstream river related design data, wherein the grid type required by model calculation adopts unstructured grids, and the grid size is subjected to regional encryption according to the stilling Chi Tixing;
step 3: according to design data such as a flood diversion tunnel outlet section, a stilling pool, a guard, a sea flood, a downstream river channel and the like, the grid file is subjected to high Cheng Fuzhi, and the method specifically comprises the following steps of:
(a) According to design data, dividing the building into a high area I, a high area II and a high area III according to whether the heights in a certain area are consistent;
(b) For the areas with equal elevation, selecting the areas in the grid file and assigning values according to the actual elevation values of the areas;
(c) For areas with different elevations, after assignment is carried out according to the slope segmentation, the elevation value of the area is subjected to interpolation processing by using software, and local adjustment and modification are carried out according to the interpolation result, so that the elevation value of the area finally meets the requirement;
(d) Finally, checking the elevation value of the whole model area to enable the elevation value to meet the requirement;
step 4: setting model parameters, simulating the effect of relief Chi Xiaoneng according to the maximum drainage flow of the flood diversion tunnel, and specifically comprising the following steps:
(a) The model roughness is set according to the actual roughness of the concrete lining, the upstream inlet is set as a flow inlet, the flow is Q, the downstream outlet is set as a flow outlet in a source mode, and the outflow flow is also Q;
(b) Measuring points are arranged on the central line of the stilling pool, and the intervals among the measuring points are as close as possible in order to accurately reflect the change condition of the water surface line;
(c) Extracting elevation data of the bottom plate of the stilling pool, wherein the extraction points are the measuring points;
(d) Uniformly drawing water surface line data of measuring points on the central line of the stilling pool and elevation data of the bottom plate of the stilling pool in an energy dissipation effect analysis chart;
(e) Extracting the reduced water depth h according to the energy dissipation effect analysis chart c0 And depth of water after jump h c1 Measuring the shrinkage water depth h according to the design plan of the stilling pool c0 Width of section B c0 And depth of water after jump h c1 Width of section B c1 Calculating to obtain the contracted water depth h c0 Average flow velocity v of water flow at section c0 ＝Q/(h c0 ×B c0 ) Depth of water after jump h c1 Average flow velocity v of water flow at section c1 ＝Q/(h c1 ×B c1 ) The method comprises the steps of carrying out a first treatment on the surface of the It can be known from the hydraulic formula:
(1) shrink depth h c0 Section energy:
(2) depth of water after jump h c1 Energy of section:
wherein, calculating the time order alpha 0 ＝α 1 Energy dissipation efficiency =1:
(3) Advantageous effects
The invention has the beneficial effects that: compared with the prior art, the method utilizes mike21 software to establish a two-dimensional mathematical model of the stilling pool, simulates and calculates the stilling effect under different stilling pool structures, has simple modeling and high calculation speed, avoids the defects that the traditional physical model test modeling modification is time-consuming and labor-consuming, the data measurement accuracy is influenced by manual operation and a measuring instrument, improves the working efficiency of the model test, reduces the working cost, and can provide scientific basis for the stilling pool optimization design.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
FIG. 1 is a plan view of an outlet stilling pool;
FIG. 2 is a grid partition diagram of a hydrodynamic mathematical model;
FIG. 3 is a graph of hydrodynamic mathematical model grid file elevation assignments;
FIG. 4 is a diagram showing the change of the water surface in the lower stilling pool calculated by numerical simulation;
FIG. 5 illustrates a diagram of the elevation change of the bottom plate of the stilling pool;
FIG. 6 is a diagram of analysis of the energy dissipation effect of the stilling pool.
Detailed Description
The technical solutions in the embodiments of the present invention will be further clearly and completely described in the following in conjunction with the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments.
Example 1
The embodiment provides a numerical simulation method for analyzing the energy dissipation effect of a flood diversion tunnel outlet stilling pool, and specifically illustrates a flood discharge energy dissipation model test of a flood diversion tunnel engineering of a three-stream water reservoir in coastal newcastle of Fuzhou, wherein the plane arrangement of the stilling pool is shown in fig. 1. The method comprises the following steps:
step 1: collecting design data of the plane and the section of a building of a flood diversion tunnel outlet section, a stilling pool, a guard, a sea flood, flood diversion tunnel flood discharge data and section type related data of a downstream river channel connecting section of a coastal new city of Fuzhou;
step 2: and establishing a grid file required by two-dimensional mathematical model calculation according to the collected flood diversion tunnel outlet section, the stilling pool, the guard, the sea diffusion and the downstream river channel related design data, wherein the grid type adopts unstructured grids, and the grid size is subjected to regional encryption according to stilling Chi Tixing. Specifically, the MIKE software is adopted to build a two-dimensional hydrodynamic mathematical model, so that the model calculation result is more reasonable and accurate, the model is divided by adopting unstructured grids in the hydrodynamic mathematical model, and the minimum grid dimension is 0.3m, as shown in fig. 2.
Step 3: according to design data such as a flood diversion tunnel outlet section, a stilling pool, a guard, a sea flood, a downstream river channel and the like, the grid file is subjected to high Cheng Fuzhi, and the method specifically comprises the following steps of:
(a) Dividing a high area I according to design data and whether the elevations in a certain area are consistent, wherein the elevation value of the high area I is 1.5m; a high area II with an elevation value of-3.0 m; and the height value of the high area III is 1.5m. A height-changing area I, the elevation value of which changes from 1.5m to-3.0 m; the height-changing area II is changed from-3.0 m to 1.5m and is basically a vertical plane;
(b) For areas with equal elevation, directly assigning values in the grid file according to the elevation values;
(c) For areas with different elevations, after assignment is carried out according to the slope segmentation, the elevation value of the area is subjected to interpolation processing by using software, and local adjustment and modification are carried out according to the interpolation result, so that the elevation value of the area finally meets the requirement;
(d) Finally, the elevation values of the entire model area are checked to meet the requirements, as shown in fig. 3.
Step 4: setting model parameters, simulating the effect of relief Chi Xiaoneng according to the maximum drainage flow of the flood diversion tunnel, and specifically comprising the following steps:
(a) The model roughness is set according to the actual roughness of the concrete lining, the upstream inlet is set as a flow inlet, the flow is Q, the downstream outlet is set as a flow outlet in a source mode, and the outflow flow is also Q; the parameters adopted in the hydrodynamic force numerical simulation calculation mainly comprise a river channel dry-wet boundary, a river channel roughness, a vortex viscosity coefficient, a time step and the like. In the simulation, the water depth threshold values of the completely wet unit and the completely dry unit are respectively 0.1m and 0.005m, namely, the unit with the water depth larger than 0.1 is the completely wet unit, the unit with the water depth smaller than 0.005m does not participate in calculation, and the unit with the water depth between the two units is the semi-wet unit. The river course roughness has very important function in numerical simulation, and the vortex viscosity coefficient value in the model is 0.28m 2 And/s, the time step is 0.01 s-30 s, and the roughness n of the concrete lining is 0.014. The upper boundary inlet flow is set to be 142m according to design requirements 3 And/s, the downstream flow rate was 142m 3 /s。
(b) After model calculation is completed, one measuring point is arranged every 0.5m on the center line of the stilling pool, and the water level value of the measuring point is extracted. The extracted water level is plotted in EXCEL as shown in fig. 4.
(c) Extracting elevation change data of the bottom plate of the absorption basin, keeping the extraction points consistent with the measurement points, and drawing the extraction points into excel, as shown in fig. 5;
(d) And uniformly drawing water surface line data of the measuring point on the central line of the stilling pool and elevation data of the bottom plate of the stilling pool in the energy dissipation effect analysis chart, as shown in fig. 6.
(e) Extracting the reduced water depth h according to the energy dissipation effect analysis chart c0 =1.28m, water depth after jump h c1 =7.09 m, and according to the design plan of the stilling pool, the shrinkage water depth h is measured c0 Width of section B c0 =8.74 m, water depth after jump h c1 Width of section B c1 =9.89 m, calculating the contracted water depth h c0 Average flow velocity v of water flow at section c0 ＝Q/(h c0 ×B c0 )＝142m 3 S/(1.28 m.times.8.74 m) =12.69 m/s, after-jump water depth h c1 Average flow rate of water flow at the section:
v c1 ＝Q/(h c1 ×B c1 )＝142m 3 s/(7.09 m×9.89 m) =2.03 m/s, according to the hydraulic formula:
(1) shrink depth h c0 Energy of section
(2) Depth of water after jump h c1 Energy of section of site
Wherein, calculating the time order alpha 0 ＝α 1 =1, energy dissipation efficiency
The foregoing examples have shown only the preferred embodiments of the invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that modifications, improvements and substitutions can be made by those skilled in the art without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (1)
1. A numerical simulation method for analyzing the energy dissipation effect of a flood diversion tunnel outlet stilling pool is characterized by comprising the following steps:
step 1: collecting design data of the planes and sections of buildings of an outlet section, a stilling pool, a guard, and a sea flood diversion tunnel, flood discharge data of the flood diversion tunnel and section type related data of a downstream river channel connecting section;
step 2: establishing a two-dimensional mathematical model according to the collected flood diversion tunnel outlet section, the stilling pool, the guard, the sea diffusion and the downstream river related design data, wherein the grid type required by model calculation adopts unstructured grids, and the grid size is subjected to regional encryption according to the stilling Chi Tixing;
step 3: according to the design data of the outlet section of the flood diversion tunnel, the stilling pool, the guard, the sea diffusion and the downstream river channel, the grid file is subjected to high Cheng Fuzhi, and the method specifically comprises the following steps of:
(a) According to design data, dividing the building into a high area I, a high area II and a high area III according to whether the heights in a certain area are consistent;
(b) For the areas with equal elevation, selecting the areas in the grid file and assigning values according to the actual elevation values of the areas;
(c) For areas with different elevations, after assignment is carried out according to the slope segmentation, the elevation value of the area is subjected to interpolation processing by using software, and local adjustment and modification are carried out according to the interpolation result, so that the elevation value of the area finally meets the requirement;
(d) Finally, checking the elevation value of the whole model area to enable the elevation value to meet the requirement;
step 4: setting model parameters, simulating the effect of relief Chi Xiaoneng according to the maximum drainage flow of the flood diversion tunnel, and specifically comprising the following steps:
(a) The model roughness is set according to the actual roughness of the concrete lining, the upstream inlet is set as a flow inlet, the flow is Q, the downstream outlet is set as a flow outlet in a source mode, and the outflow flow is also Q;
(b) Arranging measuring points on the central line of the stilling pool;
(c) Extracting elevation data of the bottom plate of the stilling pool, wherein the extraction points are the measuring points;
(d) Uniformly drawing water surface line data of measuring points on the central line of the stilling pool and elevation data of the bottom plate of the stilling pool in an energy dissipation effect analysis chart;
(e) Extracting the reduced water depth h according to the energy dissipation effect analysis chart c0 And depth of water after jump h c1 Measuring the shrinkage water depth h according to the design plan of the stilling pool c0 Width of section B c0 And depth of water after jump h c1 Width of section B c1 Calculating to obtain the contracted water depth h c0 Average flow velocity v of water flow at section c0 =Q/( h c0 ×B c0 ) Depth of water after jump h c1 Average flow velocity v of water flow at section c1 =Q/( h c1 ×B c1 ) The method comprises the steps of carrying out a first treatment on the surface of the It can be known from the hydraulic formula:
(1) shrink depth h c0 Section energy:；
(2) depth of water after jump h c1 Energy of section:；
wherein, the time order is calculatedEnergy dissipation efficiency: />。
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| CN108829986A (en) * | 2018-06-22 | 2018-11-16 | 中国水利水电科学研究院 | Method is determined based on the similar hydrological experiment model scale of energy process |
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| CN108256193A (en) * | 2018-01-10 | 2018-07-06 | 中国水利水电科学研究院 | A kind of river flood due to dam-break one, two-dimensional numerical model coupling analytical method |
| CN108829986A (en) * | 2018-06-22 | 2018-11-16 | 中国水利水电科学研究院 | Method is determined based on the similar hydrological experiment model scale of energy process |
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| 变水位条件下无压隧洞洞内消力池消能研究;罗毅和谭哲武;水电能源科学(第05期);93-96页 * |
| 库什塔依水电站导流兼泄洪洞底流消能设计的数值模拟;张岩;水力发电(第04期);73-75页 * |
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Address after: No.158, Dongda Road, Fuzhou, Fujian 350000 Applicant after: Fujian Water Resources and Hydropower Survey, design and Research Institute Co.,Ltd. Address before: 350000 No. 158, Dongda Road, Fuzhou, Fujian Applicant before: FUJIAN PROVINCIAL INVESTIGATION DESIGN & Research Institute OF WATER CONSERVANCY AND HYDROPOWER |
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| GR01 | Patent grant |