CN113160409A - Complex terrain modeling method and system suitable for refined wind field simulation - Google Patents
Complex terrain modeling method and system suitable for refined wind field simulation Download PDFInfo
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Abstract
The invention discloses a complex terrain modeling method and a system suitable for refined wind field simulation, which comprises the following steps: 1) acquiring a primary selected factory address and topographic data in a nearby preset range; 2) importing the terrain data into a mapping tool, and converting the terrain data into contour lines in a CAD graph according to set precision; 3) preprocessing the contour lines in the CAD graph; 4) inputting the CAD graph into a sketch master to generate a three-dimensional model, and then exporting the generated three-dimensional model into a three-dimensional grid stl format; 5) importing the stl format file of the three-dimensional grid into entity editing software to be converted into an entity format; 6) the method and the system can realize accurate modeling of the complex terrain, and are convenient and simple to operate.
Description
Technical Field
The invention belongs to the field of three-dimensional modeling, and relates to a complex terrain modeling method and system suitable for refined wind field simulation.
Background
In recent years, with the rapid development of the wind power generation industry, the main area of onshore wind power development begins to shift to the middle and low wind speed area. In order to ensure the profitability after project investment, higher and higher requirements are put forward on the accuracy of the refined resource exploration in the early stage of the project. However, the cost of on-site wind sensing is high and the periodicity is long, further increasing the number of wind farm on-site wind sensing sites is economically difficult to achieve. Other data sources such as the weather station and the reanalysis data can only be used as reference data and cannot be used as a main wind resource evaluation basis. Therefore, more and more wind power plants start to adopt a numerical simulation means to obtain the wind resource distribution map of the selected plant site and the nearby area. However, the accuracy of the results of numerical simulations is greatly limited by the accuracy of modeling the three-dimensional terrain, in addition to the computational grid and the selected model.
Up to now, the means and methods for modeling complex terrain are mostly rough, and very high requirements are put on the computing resources and capabilities of the computer.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a complex terrain modeling method and system suitable for refined wind field simulation, and the method and system can realize accurate modeling of complex terrain.
In order to achieve the purpose, the complex terrain modeling method suitable for refining wind field simulation comprises the following steps:
1) acquiring a primary selected factory address and topographic data in a nearby preset range;
2) importing the topographic data obtained in the step 1) into a map drawing tool, and converting the topographic data into contour lines in a CAD graph according to set precision;
3) preprocessing the contour lines in the CAD graph obtained in the step 2);
4) inputting the CAD graph processed in the step 3) into a sketch master to generate a three-dimensional model, and exporting the generated three-dimensional model into a three-dimensional grid stl format file;
5) importing the stl format file of the three-dimensional grid obtained in the step 4) into entity editing software to be converted into an entity format;
6) and (3) performing geometric operation on the surface of the entity obtained in the step 5) to obtain a definition domain required by CFD calculation, and then performing complex terrain modeling according to the definition domain required by CFD calculation.
In the step 1), mapping on the spot or acquiring the primary selected factory address and the topographic data in the nearby preset range by using a DEM database.
The geometric operation in step 6) includes stretching and clipping.
The mapping tool is Global Mapper;
in the step 2), importing the topographic data in the step 1) into a Global Mapper to generate a contour file with the resolution of 30m × 30 m.
And (3) converting the three-dimensional grid stl format file obtained in the step 4) into a step entity format file in Rhinoeros by using entity editing software as Rhinoceros.
Inputting the CAD image processed in the step 3) into a toposhape plug-in unit of a sketch master for processing.
A complex terrain modeling system adapted to refine wind farm simulations comprising:
the acquisition module is used for acquiring the primary selected factory address and topographic data in a nearby preset range;
the first conversion module is used for importing the terrain data into a mapping tool and converting the terrain data into contour lines in the CAD graph according to set precision;
the preprocessing module is used for preprocessing the contour lines in the CAD graph;
the generating module is used for inputting the CAD graph into a sketch master to generate a three-dimensional model, and then exporting the generated three-dimensional model into a three-dimensional grid stl format file;
the second conversion module is used for importing the three-dimensional grid stl format file into entity editing software to be converted into an entity format;
and the construction module is used for performing geometric operation on the surface of the entity to obtain a definition domain required by CFD calculation, and then performing complex terrain modeling according to the definition domain required by CFD calculation.
The invention has the following beneficial effects:
when the complex terrain modeling method and the complex terrain modeling system suitable for refined wind field simulation are specifically operated, the terrain data are processed by means of a mapping tool, a sketch master and entity editing software, meanwhile, the surface of an entity is geometrically operated to obtain a definition domain required by CFD calculation, then the complex terrain modeling is performed according to the definition domain required by the CFD calculation, the precision is high, the operation is convenient and simple, the terrain modeling period is greatly shortened, both actual surveying and mapping terrain data and DEM database terrain data can be processed, the terrain modeling precision and the terrain modeling range can be adjusted according to the needs of users, and a good foundation is laid for the refined simulation of a subsequent wind field.
Drawings
FIG. 1 is a schematic representation of a CAD contour of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional terrain generated by a sketch master in the present invention;
FIG. 3 is a schematic diagram of a three-dimensional entity generated by the geometric transformation tool of the present invention;
FIG. 4 is a schematic diagram of a three-dimensional terrain definition domain generated in the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the complex terrain modeling method suitable for refining wind field simulation comprises the following steps:
1) acquiring a primary selected factory address and topographic data in a nearby preset range;
in the step 1), mapping on the spot or acquiring the primary selected factory address and the topographic data in the nearby preset range by using a DEM database.
2) Importing the topographic data obtained in the step 1) into a mapping tool, converting the topographic data into contour lines in a CAD graph according to set precision, and referring to FIG. 1;
the mapping tool is Global Mapper; in the step 2), importing the topographic data in the step 1) into a Global Mapper to generate a contour file with the resolution of 30m × 30 m.
3) Preprocessing the contour lines in the CAD graph obtained in the step 2);
the specific operation of the step 3) is as follows:
and (3) clearing all layers except the contour line in the CAD file, only reserving the contour line of the required area, converting the contour line into a closed multi-segment line, and deleting the multi-segment line which is overlapped with each other.
4) Inputting the CAD graph processed in the step 3) into a sketch master to generate a three-dimensional model, and exporting the generated three-dimensional model into a three-dimensional grid stl format file;
the range of the required simulated terrain is large, and the terrain is complex, so the CAD image processed in the step 3) is input into a toposhape plug-in unit of a sketch master for processing, and a three-dimensional terrain map after processing is shown in FIG. 2. When the required terrain range is small and the altitude difference is small, a sandbox tool carried by a sketch master can be selected to convert the contour line into a three-dimensional format.
During specific operation, the obtained CAD file is imported into a sketch master, the original coordinates are kept unchanged, and only the layer where the contour lines are located is imported.
5) Importing the stl format file of the three-dimensional grid obtained in the step 4) into entity editing software to be converted into an entity format;
the entity editing software is Rhinoceros, the three-dimensional grid stl format file obtained in the step 4) is converted into a step entity format file in Rhinoceros, and the conversion result is shown in fig. 3.
6) Performing geometric operation on the surface of the entity obtained in the step 5) to obtain a definition domain required by CFD calculation, and then performing complex terrain modeling according to the definition domain required by CFD calculation, as shown in FIG. 4.
The geometric operation in step 6) includes stretching and clipping.
The complex terrain modeling system suitable for refining wind field simulation comprises:
the acquisition module is used for acquiring the primary selected factory address and topographic data in a nearby preset range;
the first conversion module is used for importing the terrain data into a mapping tool and converting the terrain data into contour lines in the CAD graph according to set precision;
the preprocessing module is used for preprocessing the contour lines in the CAD graph;
the generating module is used for inputting the CAD graph into a sketch master to generate a three-dimensional model, and then exporting the generated three-dimensional model into a three-dimensional grid stl format file;
the second conversion module is used for importing the three-dimensional grid stl format file into entity editing software to be converted into an entity format;
and the construction module is used for performing geometric operation on the surface of the entity to obtain a definition domain required by CFD calculation, and then performing complex terrain modeling according to the definition domain required by CFD calculation.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (7)
1. A complex terrain modeling method suitable for refined wind field simulation is characterized by comprising the following steps:
1) acquiring a primary selected factory address and topographic data in a nearby preset range;
2) importing the topographic data obtained in the step 1) into a map drawing tool, and converting the topographic data into contour lines in a CAD graph according to set precision;
3) preprocessing the contour lines in the CAD graph obtained in the step 2);
4) inputting the CAD graph processed in the step 3) into a sketch master to generate a three-dimensional model, and exporting the generated three-dimensional model into a three-dimensional grid stl format file;
5) importing the stl format file of the three-dimensional grid obtained in the step 4) into entity editing software to be converted into an entity format;
6) and (3) performing geometric operation on the surface of the entity obtained in the step 5) to obtain a definition domain required by CFD calculation, and then performing complex terrain modeling according to the definition domain required by CFD calculation.
2. The complex terrain modeling method suitable for refining wind farm simulation as recited in claim 1, wherein in step 1), the primary plant site and terrain data within a nearby preset range are obtained by mapping in the field or by using a DEM database.
3. The method for modeling complex terrain adapted for refining wind farm simulations according to claim 1, wherein the geometric operations in step 6) comprise stretching and cropping.
4. The complex terrain modeling method adapted for refining wind farm simulations according to claim 1, wherein the mapping tool is Global Mapper;
in the step 2), importing the topographic data in the step 1) into a GlobalMapper to generate a contour file with the resolution of 30m x 30 m.
5. The method for modeling complex terrain suitable for refining wind farm simulation as recited in claim 1, wherein the entity editing software is Rhinoceros, and the three-dimensional mesh stl format file obtained in step 4) is converted into a step entity format file in Rhinoeros.
6. The method for modeling complex terrain suitable for refining wind farm simulation of claim 1, wherein the CAD image processed in step 3) is input into a toposhape plug-in unit of a sketcher for processing.
7. A complex terrain modeling system adapted to refine wind farm simulations, comprising:
the acquisition module is used for acquiring the primary selected factory address and topographic data in a nearby preset range;
the first conversion module is used for importing the terrain data into a mapping tool and converting the terrain data into contour lines in the CAD graph according to set precision;
the preprocessing module is used for preprocessing the contour lines in the CAD graph;
the generating module is used for inputting the CAD graph into a sketch master to generate a three-dimensional model, and then exporting the generated three-dimensional model into a three-dimensional grid stl format file;
the second conversion module is used for importing the three-dimensional grid stl format file into entity editing software to be converted into an entity format;
and the construction module is used for performing geometric operation on the surface of the entity to obtain a definition domain required by CFD calculation, and then performing complex terrain modeling according to the definition domain required by CFD calculation.
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2021
- 2021-02-26 CN CN202110218247.0A patent/CN113160409A/en active Pending
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