CN111241760A - Upscale calculation method for urban pollutant diffusion - Google Patents
Upscale calculation method for urban pollutant diffusion Download PDFInfo
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Abstract
The invention discloses a upscaling calculation method for urban pollutant diffusion, which comprises the following steps: s1, selecting one cell A from the cell buildings of the calculated city as a first calculation object; s2, obtaining length and width values of buildings in the cell A and plane data, wherein the length and width values and the plane data take meters as units; s3, acquiring the height of the building in the cell A; the invention provides a scale-up calculation method for urban pollutant diffusion, which comprises the steps of firstly selecting similar cells in a city, carrying out numerical calculation on pollutant diffusion by adopting a CFD (computational fluid dynamics) method, taking the obtained result as an input item, further selecting the city as the whole calculation space, and then carrying out CFD calculation to obtain a pollutant diffusion result of the whole city. This avoids building the geometry of the entire urban building and thus reduces the workload. And the result of calculation under the small scale can be applied to different cities, and the result of one-time calculation can be reused, thereby greatly improving the efficiency.
Description
Technical Field
The invention relates to the technical field of urban pollutants, in particular to an upscale calculation method for urban pollutant diffusion.
Background
In recent years, with the progress of urbanization in China, real estate is developed in many cities, so that the urban building density is increased continuously, and the urban environment is greatly influenced. The city is the region with the most intensive population activities, and the diffusion of pollution such as automobile exhaust has great influence on the safety of people, so that the simulation of the diffusion of urban pollutants is necessary.
At present, most of the urban buildings are directly modeled and then analyzed in the past. The method needs to establish a geometric model for the whole city and then divide the grids, and has huge workload. And the work needs to be repeated once when the city is changed, and the efficiency is not high. Therefore, an upscaling calculation method for urban pollutant diffusion is provided.
Disclosure of Invention
The invention aims to provide a method for calculating the upscaling of urban pollutant diffusion, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for calculating the upscaling of urban pollutant diffusion comprises the following steps:
s1, selecting one cell A from the cell buildings of the calculated city as a first calculation object;
s2, obtaining length and width values of buildings in the cell A and plane data, wherein the length and width values and the plane data take meters as units;
s3, acquiring the height of the building in the cell A, wherein the height is taken in meters as a unit;
s4, selecting a calculation domain, and simulating a pollutant diffusion value of the cell A by using CFD software according to the building height H and the building length and width values of the cell A obtained in S2 and S3;
s5, simulating the pollutant representative quantity of the area where the district A building is located through CFD software according to the pollutant diffusion value of the district A simulated in S4;
s6, selecting a calculated urban cell B and a calculated urban cell C, repeating S1, S1, S2, S3, S4 and S5, and respectively obtaining the representative quantity of pollutants in the areas where the buildings of the cell B and the cell C are located by taking the cell B and the cell C as calculation objects;
s7, the city to be measured is used as a calculation domain, each cell is used as a local space, the pollutant representative quantity of the area where the buildings of the cell A, the cell B and the cell C are located is equalized in S5 and S6, the equalized data is used as a source item, and the pollutant diffusion result of the whole city is simulated through CFD software.
As further preferable in the present technical solution: in S2, in the cell a, the length and width values of the building in the cell a are measured by the measuring instrument.
As further preferable in the present technical solution: and in the step S3, measuring the length of the building shadow by using a measuring instrument, selecting a three-dimensional reference object A, measuring the shadow length and the height of the reference object A by using the measuring instrument, and obtaining the height value H of the building in the cell A in meters by using the ratio of the building shadow length to the building height and the ratio of the shadow length to the height of the reference object A.
As further preferable in the present technical solution: the reference object A is a three-dimensional rod.
As further preferable in the present technical solution: in the S5 and S7, the CFD software is one of Fluent, CFX or STAR-CD software.
As further preferable in the present technical solution: in the step S4, a calculation domain is selected, building height H is used as a basic value, the front end of the calculation domain is set to be H with a numerical value of five times, the rear end of the calculation domain is set to be H with a numerical value of ten times, two sides of the calculation domain are set to be H with a numerical value of five times, the height of the two sides of the calculation domain is set to be H with a numerical value of seven times, the distance from a first entrance of a cell A to a nearest building is H with a numerical value of five times, the distance from a second entrance of the cell A to the nearest building is H with a numerical value of ten times, the height of an upper boundary of the calculation domain to the ground is H with a numerical value of seven times, and the.
As further preferable in the present technical solution: in S5, the pollutant representative amount of the area where the building of the cell a is located is simulated by CFD software according to the pollutant diffusion value and the calculated domain data of the cell a.
As further preferable in the present technical solution: in S7, the equalization is to add the representative amounts of the pollutants in the areas where the buildings of the cell a, the cell B and the cell C are located, and divide the sum by three to calculate the corresponding data.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a scale-up calculation method for urban pollutant diffusion, which comprises the steps of firstly selecting similar cells in a city, carrying out numerical calculation on pollutant diffusion by adopting a CFD (computational fluid dynamics) method, taking the obtained result as an input item, further selecting the city as the whole calculation space, and then carrying out CFD calculation to obtain a pollutant diffusion result of the whole city. This avoids building the geometry of the entire urban building and thus reduces the workload. And the result of calculation under the small scale can be applied to different cities, and the result of one-time calculation can be reused, thereby greatly improving the efficiency.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to data in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a technical scheme that: a method for calculating the upscaling of urban pollutant diffusion comprises the following steps:
s1, selecting one cell A from the cell buildings of the calculated city as a first calculation object;
s2, obtaining length and width values of buildings in the cell A and plane data, wherein the length and width values and the plane data take meters as units;
s3, acquiring the height of the building in the cell A, wherein the height is taken in meters as a unit;
s4, selecting a calculation domain, and simulating a pollutant diffusion value of the cell A by using CFD software according to the building height H and the building length and width values of the cell A obtained in S2 and S3;
s5, simulating the pollutant representative quantity of the area where the district A building is located through CFD software according to the pollutant diffusion value of the district A simulated in S4;
s6, selecting a calculated urban cell B and a calculated urban cell C, repeating S1, S1, S2, S3, S4 and S5, and respectively obtaining the representative quantity of pollutants in the areas where the buildings of the cell B and the cell C are located by taking the cell B and the cell C as calculation objects;
s7, the city to be measured is used as a calculation domain, each cell is used as a local space, the pollutant representative quantity of the area where the buildings of the cell A, the cell B and the cell C are located is equalized in S5 and S6, the equalized data is used as a source item, and the pollutant diffusion result of the whole city is simulated through CFD software.
In this embodiment, specifically: in S2, in the cell a, the length and width values of the building in the cell a are measured by the measuring instrument.
In this embodiment, specifically: and in the step S3, measuring the length of the building shadow by using a measuring instrument, selecting a three-dimensional reference object A, measuring the shadow length and the height of the reference object A by using the measuring instrument, and obtaining the height value H of the building in the cell A in meters by using the ratio of the building shadow length to the building height and the ratio of the shadow length to the height of the reference object A.
In this embodiment, specifically: the reference object A is a three-dimensional rod.
In this embodiment, specifically: in the S5 and S7, the CFD software is Fluent software.
In this embodiment, specifically: in the step S4, a calculation domain is selected, building height H is used as a basic value, the front end of the calculation domain is set to be H with a numerical value of five times, the rear end of the calculation domain is set to be H with a numerical value of ten times, two sides of the calculation domain are set to be H with a numerical value of five times, the height of the two sides of the calculation domain is set to be H with a numerical value of seven times, the distance from a first entrance of a cell A to a nearest building is H with a numerical value of five times, the distance from a second entrance of the cell A to the nearest building is H with a numerical value of ten times, the height of an upper boundary of the calculation domain to the ground is H with a numerical value of seven times, and the.
In this embodiment, specifically: in S5, the pollutant representative amount of the area where the building of the cell a is located is simulated by CFD software according to the pollutant diffusion value and the calculated domain data of the cell a.
In this embodiment, specifically: in S7, the equalization is to add the representative amounts of the pollutants in the areas where the buildings of the cell a, the cell B and the cell C are located, and divide the sum by three to calculate the corresponding data.
Example 2
The invention provides a technical scheme that: a method for calculating the upscaling of urban pollutant diffusion comprises the following steps:
s1, selecting one cell A from the cell buildings of the calculated city as a first calculation object;
s2, obtaining length and width values of buildings in the cell A and plane data, wherein the length and width values and the plane data take meters as units;
s3, acquiring the height of the building in the cell A, wherein the height is taken in meters as a unit;
s4, selecting a calculation domain, and simulating a pollutant diffusion value of the cell A by using CFD software according to the building height H and the building length and width values of the cell A obtained in S2 and S3;
s5, simulating the pollutant representative quantity of the area where the district A building is located through CFD software according to the pollutant diffusion value of the district A simulated in S4;
s6, selecting a calculated urban cell B and a calculated urban cell C, repeating S1, S1, S2, S3, S4 and S5, and respectively obtaining the representative quantity of pollutants in the areas where the buildings of the cell B and the cell C are located by taking the cell B and the cell C as calculation objects;
s7, the city to be measured is used as a calculation domain, each cell is used as a local space, the pollutant representative quantity of the area where the buildings of the cell A, the cell B and the cell C are located is equalized in S5 and S6, the equalized data is used as a source item, and the pollutant diffusion result of the whole city is simulated through CFD software.
In this embodiment, specifically: in S2, in the cell a, the length and width values of the building in the cell a are measured by the measuring instrument.
In this embodiment, specifically: and in the step S3, measuring the length of the building shadow by using a measuring instrument, selecting a three-dimensional reference object A, measuring the shadow length and the height of the reference object A by using the measuring instrument, and obtaining the height value H of the building in the cell A in meters by using the ratio of the building shadow length to the building height and the ratio of the shadow length to the height of the reference object A.
In this embodiment, specifically: the reference object A is a three-dimensional rod.
In this embodiment, specifically: in the S5 and S7, CFD software is CFX software.
In this embodiment, specifically: in the step S4, a calculation domain is selected, building height H is used as a basic value, the front end of the calculation domain is set to be H with a numerical value of five times, the rear end of the calculation domain is set to be H with a numerical value of ten times, two sides of the calculation domain are set to be H with a numerical value of five times, the height of the two sides of the calculation domain is set to be H with a numerical value of seven times, the distance from a first entrance of a cell A to a nearest building is H with a numerical value of five times, the distance from a second entrance of the cell A to the nearest building is H with a numerical value of ten times, the height of an upper boundary of the calculation domain to the ground is H with a numerical value of seven times, and the.
In this embodiment, specifically: in S5, the pollutant representative amount of the area where the building of the cell a is located is simulated by CFD software according to the pollutant diffusion value and the calculated domain data of the cell a.
In this embodiment, specifically: in S7, the equalization is to add the representative amounts of the pollutants in the areas where the buildings of the cell a, the cell B and the cell C are located, and divide the sum by three to calculate the corresponding data.
Example 3
The invention provides a technical scheme that: a method for calculating the upscaling of urban pollutant diffusion comprises the following steps:
s1, selecting one cell A from the cell buildings of the calculated city as a first calculation object;
s2, obtaining length and width values of buildings in the cell A and plane data, wherein the length and width values and the plane data take meters as units;
s3, acquiring the height of the building in the cell A, wherein the height is taken in meters as a unit;
s4, selecting a calculation domain, and simulating a pollutant diffusion value of the cell A by using CFD software according to the building height H and the building length and width values of the cell A obtained in S2 and S3;
s5, simulating the pollutant representative quantity of the area where the district A building is located through CFD software according to the pollutant diffusion value of the district A simulated in S4;
s6, selecting a calculated urban cell B and a calculated urban cell C, repeating S1, S1, S2, S3, S4 and S5, and respectively obtaining the representative quantity of pollutants in the areas where the buildings of the cell B and the cell C are located by taking the cell B and the cell C as calculation objects;
s7, the city to be measured is used as a calculation domain, each cell is used as a local space, the pollutant representative quantity of the area where the buildings of the cell A, the cell B and the cell C are located is equalized in S5 and S6, the equalized data is used as a source item, and the pollutant diffusion result of the whole city is simulated through CFD software.
In this embodiment, specifically: in S2, in the cell a, the length and width values of the building in the cell a are measured by the measuring instrument.
In this embodiment, specifically: and in the step S3, measuring the length of the building shadow by using a measuring instrument, selecting a three-dimensional reference object A, measuring the shadow length and the height of the reference object A by using the measuring instrument, and obtaining the height value H of the building in the cell A in meters by using the ratio of the building shadow length to the building height and the ratio of the shadow length to the height of the reference object A.
In this embodiment, specifically: the reference object A is a three-dimensional rod.
In this embodiment, specifically: in the S5 and S7, the CFD software is STAR-CD software.
In this embodiment, specifically: in the step S4, a calculation domain is selected, building height H is used as a basic value, the front end of the calculation domain is set to be H with a numerical value of five times, the rear end of the calculation domain is set to be H with a numerical value of ten times, two sides of the calculation domain are set to be H with a numerical value of five times, the height of the two sides of the calculation domain is set to be H with a numerical value of seven times, the distance from a first entrance of a cell A to a nearest building is H with a numerical value of five times, the distance from a second entrance of the cell A to the nearest building is H with a numerical value of ten times, the height of an upper boundary of the calculation domain to the ground is H with a numerical value of seven times, and the.
In this embodiment, specifically: in S5, the pollutant representative amount of the area where the building of the cell a is located is simulated by CFD software according to the pollutant diffusion value and the calculated domain data of the cell a.
In this embodiment, specifically: in S7, the equalization is to add the representative amounts of the pollutants in the areas where the buildings of the cell a, the cell B and the cell C are located, and divide the sum by three to calculate the corresponding data.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for calculating the upscaling of urban pollutant diffusion is characterized by comprising the following steps:
s1, selecting one cell A from the cell buildings of the calculated city as a first calculation object;
s2, obtaining length and width values of buildings in the cell A and plane data, wherein the length and width values and the plane data take meters as units;
s3, acquiring the height of the building in the cell A, wherein the height is taken in meters as a unit;
s4, selecting a calculation domain, and simulating a pollutant diffusion value of the cell A by using CFD software according to the building height H and the building length and width values of the cell A obtained in S2 and S3;
s5, simulating the pollutant representative quantity of the area where the district A building is located through CFD software according to the pollutant diffusion value of the district A simulated in S4;
s6, selecting a calculated urban cell B and a calculated urban cell C, repeating S1, S1, S2, S3, S4 and S5, and respectively obtaining the representative quantity of pollutants in the areas where the buildings of the cell B and the cell C are located by taking the cell B and the cell C as calculation objects;
s7, the city to be measured is used as a calculation domain, each cell is used as a local space, the pollutant representative quantity of the area where the buildings of the cell A, the cell B and the cell C are located is equalized in S5 and S6, the equalized data is used as a source item, and the pollutant diffusion result of the whole city is simulated through CFD software.
2. The upscaling calculation method for urban pollutant dispersion according to claim 1, characterized in that: in S2, in the cell a, the length and width values of the building in the cell a are measured by the measuring instrument.
3. The upscaling calculation method for urban pollutant dispersion according to claim 1, characterized in that: and in the step S3, measuring the length of the building shadow by using a measuring instrument, selecting a three-dimensional reference object A, measuring the shadow length and the height of the reference object A by using the measuring instrument, and obtaining the height value H of the building in the cell A in meters by using the ratio of the building shadow length to the building height and the ratio of the shadow length to the height of the reference object A.
4. The upscaling calculation method for urban pollutant dispersion according to claim 3, characterized in that: the reference object A is a three-dimensional rod.
5. The upscaling calculation method for urban pollutant dispersion according to claim 1, characterized in that: in the S5 and S7, the CFD software is one of Fluent, CFX or STAR-CD software.
6. The upscaling calculation method for urban pollutant dispersion according to claim 1, characterized in that: in the step S4, a calculation domain is selected, building height H is used as a basic value, the front end of the calculation domain is set to be H with a numerical value of five times, the rear end of the calculation domain is set to be H with a numerical value of ten times, two sides of the calculation domain are set to be H with a numerical value of five times, the height of the two sides of the calculation domain is set to be H with a numerical value of seven times, the distance from a first entrance of a cell A to a nearest building is H with a numerical value of five times, the distance from a second entrance of the cell A to the nearest building is H with a numerical value of ten times, the height of an upper boundary of the calculation domain to the ground is H with a numerical value of seven times, and the.
7. The upscaling calculation method for urban pollutant dispersion according to claim 1, characterized in that: in S5, the pollutant representative amount of the area where the building of the cell a is located is simulated by CFD software according to the pollutant diffusion value and the calculated domain data of the cell a.
8. The upscaling calculation method for urban pollutant dispersion according to claim 1, characterized in that: in S7, the equalization is to add the representative amounts of the pollutants in the areas where the buildings of the cell a, the cell B and the cell C are located, and divide the sum by three to calculate the corresponding data.
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| CN202010055586.7A CN111241760A (en) | 2020-01-17 | 2020-01-17 | Upscale calculation method for urban pollutant diffusion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113191096A (en) * | 2021-04-13 | 2021-07-30 | 中南建筑设计院股份有限公司 | WRF and XLow coupling-based multi-fineness fusion pollutant diffusion analysis method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113191096A (en) * | 2021-04-13 | 2021-07-30 | 中南建筑设计院股份有限公司 | WRF and XLow coupling-based multi-fineness fusion pollutant diffusion analysis method |
| CN113191096B (en) * | 2021-04-13 | 2022-04-29 | 中南建筑设计院股份有限公司 | WRF and XLow coupling-based multi-fineness fusion pollutant diffusion analysis method |
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