JP2600466B2 - Method and apparatus for displaying fluid analysis result - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method and a device for displaying a fluid analysis result, and more specifically, based on shape data of an obstacle defined by a plurality of polygons. The present invention relates to a method and apparatus for performing fluid analysis by a difference method using an orthogonal coordinate system and displaying analysis result data on an obstacle.

<Conventional Techniques and Problems to be Solved by the Invention> Conventionally, when conducting heat conduction analysis, fluid analysis, and the like using computer aided engineering (CAE), a difference method,
Three types of fluid analysis methods, the finite element method and the boundary element method, are generally adopted. Among these fluid analysis methods, the difference method is a method of obtaining a solution by performing a mathematical approximation called a difference on a physically strict governing equation, and is often used for fluid analysis applications. This difference method has an advantage that the analysis speed is faster than other methods.However, since an orthogonal grid is used, for example, a fluid analysis near the surface of an obstacle is performed, and the analysis result data is obtained. When displaying on an obstacle, there is a disadvantage that the shape of the obstacle itself is distorted and it becomes difficult to recognize the analysis result. Specifically, when performing fluid analysis, the fifth
As shown in the figure, first, shape data of an obstacle is created by a modeler (61), stored in a shape data file (62), and the shape data is read from the shape data file (62) to be read by a pre-processor (63). ) Creates input data (structure grid, fluid occupancy, aperture ratio, boundary conditions, etc.) for fluid analysis and stores it in the input data file (64),
Input data is read from the input data file (64), fluid analysis is performed by the fluid analysis program (65), the analysis result data is stored in the analysis result data file (66), and the analysis result data file (66) is read. It has a system configuration in which the analysis result data is read and the post processor (67) visually displays the analysis result.
Therefore, even if the obstacle is a sphere as shown in FIG. 6 (A), the obstacle obtained based on the fluid analysis result is recognized as a cell where the fluid occupancy is 0, As shown in FIG. 2B, the obstacle is displayed as an obstacle that is far away from the sphere, and it is almost impossible to correlate the actual obstacle with the analysis result data.

FIG. 6 shows a specific example in which the shape is extremely distorted. However, when performing fluid analysis based on an obstacle including many curved surfaces and inclined surfaces and displaying analysis result data together with the obstacle, Will have the same disadvantages. In addition, similar inconveniences occur when applied to applications other than fluid analysis.

<Object of the Invention> The present invention has been made in view of the above problems, and has as its object to provide a novel fluid analysis result display method and apparatus capable of displaying a fluid analysis result in an easily recognizable state. I have.

<Means for Solving the Problems> In order to achieve the above object, a fluid analysis result display method according to a first aspect of the present invention provides a fluid analysis result display method based on a rectangular coordinate system based on shape data of an obstacle defined by a plurality of polygons. The analysis result data on the grid points is obtained by performing the fluid analysis by the difference method using the difference method on the grid points, and performing the interpolation operation based on the analysis result data to obtain the analysis result data on the surface of the frost damage object defined by the plurality of polygons. Obtain, the shape data of the obstacle defined by the plurality of polygons is adopted as obstacle display data instead of the shape data of the obstacle obtained based on the fluid occupancy, and on the adopted obstacle display data This is a method of displaying the analysis result data.

According to a second aspect of the present invention, there is provided a fluid analysis result display method, comprising: performing a fluid analysis by a difference method using an orthogonal coordinate system based on shape data of an obstacle defined by a plurality of polygons; Obtain the analysis result data at the vertices of each polygon by performing an interpolation operation based on the analysis result data, and obtain the shape data of the obstacle defined by the plurality of polygons based on the fluid occupancy. The analysis result data obtained by the above-described interpolation calculation is displayed on each vertex of the adopted obstacle display data instead of the shape data of the object, and is displayed on each vertex of the adopted obstacle display data. This is a method of displaying analysis result data obtained by performing an interpolation operation based on analysis result data on a vertex.

According to a third aspect of the present invention, there is provided a fluid analysis result display device that performs a fluid analysis by a difference method using an orthogonal coordinate system based on shape data of an obstacle defined by a plurality of polygons, and analyzes result data on a grid point. And a plurality of polygons, by performing an interpolation operation based on the obtained analysis result data to obtain analysis result data on the surface of the obstacle defined by the plurality of polygons. Obstacle display data selecting means for selecting the defined obstacle shape data as obstacle display data instead of the obstacle shape data obtained based on the fluid occupancy, and on the selected obstacle display data Analysis result display means for displaying the analysis result data.

According to a fourth aspect of the present invention, there is provided a fluid analysis result display device that performs a fluid analysis by a difference method using an orthogonal coordinate system based on shape data of an obstacle defined by a plurality of polygons, and obtains analysis result data on a grid point. , A first interpolation operation means for obtaining analysis result data at the vertices of each polygon by performing an interpolation operation based on the obtained analysis result data, and an obstruction defined by a plurality of polygons. Obstacle display data selecting means for adopting the shape data as obstacle display data instead of the obstacle shape data obtained based on the fluid occupancy, and performing the interpolation operation on each vertex of the selected obstacle display data Analysis result assigning means for assigning the analysis result data obtained by the above, and an interpolation operation based on the analysis result data on the corresponding vertex is performed on a point other than the vertex, Second obtaining analysis result data on
Interpolation calculation means and analysis result display means for displaying the analysis result data obtained by the first interpolation calculation means and the second interpolation calculation means on the selected obstacle display data are included.

<Operation> According to the fluid analysis result display method of the first aspect of the present invention, even if the analysis result data obtained by the difference method using the rectangular coordinate system is data in which a structured grid having a fluid occupancy of 0 is an obstacle. By performing an interpolation operation based on the analysis result data, it is possible to obtain analysis result data on the surface of an obstacle defined by a plurality of polygons. Then, the shape data of the obstacle defined by the plurality of polygons is adopted as obstacle display data instead of the shape data of the obstacle obtained based on the fluid occupancy, and the adopted obstacle display data is displayed on the adopted obstacle display data. By displaying the above analysis result data,
The correlation between the analysis result data and the actual obstacle can be displayed in a state in which it is extremely easy to recognize.

With the fluid analysis result display method according to the second aspect of the present invention, even if the analysis result data obtained by the difference method using the rectangular coordinate system is data in which a structured grid having a fluid occupancy of 0 is an obstacle, the analysis result is obtained. By performing an interpolation operation based on the data, analysis result data at each vertex of each polygon of the obstacle defined by the plurality of polygons can be obtained.
Then, by performing an interpolation operation based on the analysis result data at each vertex of each polygon, analysis result data at points other than the vertex can be obtained. Therefore, the obstacle shape data defined by the plurality of polygons is adopted as obstacle display data instead of the obstacle shape data obtained based on the fluid occupancy, and the adopted obstacle display data is displayed on the adopted obstacle display data. By displaying the above analysis result data,
It is possible to display the correlation between the analysis result data and the actual obstacle in a state in which it is extremely easy to confirm.

With the fluid analysis result display device according to the third aspect of the present invention, even if the analysis result data obtained by the difference method using the rectangular coordinate system is data in which a structured grid having a fluid occupancy of 0 is an obstacle, the fluid analysis is performed. By performing an interpolation operation by the interpolation operation means based on the analysis result data obtained by the means, it is possible to obtain analysis result data on the surface of the obstacle defined by a plurality of polygons. Then, the obstacle display data selecting means selects the obstacle shape data defined by the plurality of polygons as obstacle display data instead of the obstacle shape data obtained based on the fluid occupancy, and analyzes the data. By displaying the analysis result data on the selected obstacle display data by the result display means, it is possible to display the correlation between the analysis result data and the actual obstacle in a state in which it is extremely easy to confirm.

With the fluid analysis result display device according to the fourth aspect of the present invention, even if the analysis result data obtained by the difference method using the rectangular coordinate system is data in which a structured grid having a fluid occupancy of 0 is an obstacle, the fluid analysis is performed. By performing an interpolation operation by the first interpolation operation means based on the analysis result data obtained by the means, it is possible to obtain analysis result data at each vertex of each polygon of the obstacle defined by the plurality of polygons.
Then, by performing an interpolation operation by the second interpolation operation means based on the analysis result data at each vertex of each polygon, analysis result data at points other than the vertex can be obtained. Therefore, by the obstacle display data selection means,
Obstacle shape data defined by multiple polygons,
The analysis is performed by selecting the obstacle display data instead of the obstacle shape data obtained based on the fluid occupancy, and displaying the analysis result data on the selected obstacle display data by the analysis result display means. The correlation between the result data and the actual obstacle can be displayed in a state in which the correlation is remarkably easy to recognize.

<Example> Hereinafter, an example will be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram schematically showing a configuration of a fluid analysis system to which the fluid analysis result display method of the present invention is applied. First, shape data of an obstacle is created by a modeler (21) and a shape data file ( 22), read the shape data from the shape data file (22) and create input data (structure grid, fluid occupancy, aperture ratio, boundary conditions, etc.) for fluid analysis by the pre-processor (23) And store it in the input data file (24), read the input data from the input data file (24), perform fluid analysis with the fluid analysis program (25), and convert the analysis result data to the analysis result data file (26) Stored in the
Read the shape of the obstacle from the file (22),
The analysis result data is read from the analysis result data file (26), and the post processor (27) performs visual display of the analysis result.

FIG. 1 is a flow chart showing one embodiment of a fluid analysis result display method according to the present invention. When fluid analysis based on a finite difference method using an orthogonal coordinate system is performed and analysis result data is obtained, the step is performed. It is determined whether the analysis result data is obtained as data on the lattice point of the structured grid or as data on the central point of the structured grid.If the data is obtained as data on the central point of the structured grid, By performing an interpolation operation based on the analysis result data corresponding to the structural lattices adjacent to each other in the step, the analysis result data on the lattice points of the structural lattice is obtained. If it is determined in the step that the analysis result data is obtained as data on the lattice points of the structured grid, or if the processing of the step is performed, in the step, a plurality of polygons forming the obstacle are Selecting one vertex from the plurality of vertices, extracting a structured grid including the selected vertex in the step, and determining whether the selected vertex matches a grid point of the extracted structured grid in the step Then, it is sequentially determined whether or not the selected vertex coincides with the ridge line of the extracted structural lattice, and whether or not the selected vertex coincides with the surface of the extracted structural lattice. And
In the step, when it is determined that the selected vertex coincides with the extracted lattice point of the structured lattice, the analysis result data of the corresponding lattice point is set as the analysis result data of the selected vertex in the step, and in the step, If it is determined that the selected vertex coincides with the ridge line of the extracted structural grid, the analysis result data at the vertex is calculated based on the distance between the vertex and the two grid points forming the ridge line in the step. If it is determined that the selected vertex coincides with the surface of the extracted structural grid, the analysis result data at the vertex is calculated based on the distance between the vertex and the four lattice points forming the surface in step, In step, if it is determined that the selected vertex does not match the surface of the extracted structured grid, It calculates the analysis result data at a vertex based on the distance between the eight lattice points and vertices constituting a. Then, after any of the steps is performed, it is determined whether or not the processing has been completed for all vertices of all polygons in the step, and there are vertices for which processing has not been completed. Is determined, the next vertex is selected in the step,
The step processing is performed again. Conversely, if it is determined in step that the processing for all vertices of all polygons has been completed, then in step, any polygon is selected, and in step, each of the vertices of the selected polygon is By performing an interpolation operation based on the analysis result data, analysis result data at points other than the vertices included in the polygon is obtained, and the steps are repeated until it is determined that the processing of the step has been performed on all the polygons in the step. If the processing is repeated and the step processing is performed for all the polygons, contour lines (contour lines) are displayed together with a plurality of polygons constituting the obstacle at the step, and the series of processing ends as it is.

FIGS. 2A to 2C are specific examples for explaining the processing of the steps. When a sphere as an obstacle is defined on a rectangular coordinate system as shown in FIG. As shown by black circles and X marks in FIG. 2B, respectively, analysis result data at the center point of the structured grid and at grid points of the structured grid may be obtained. In the latter case, the obtained analysis result data is obtained. However, in the former case, as shown in FIG. 2C, eight structural grids (C1) to (C8) sharing the target grid point are extracted, and each structure grid is extracted. If the analysis result data at the center point of the lattice is S1 to S8 and the volume of each structural lattice is V1 to V8, the analysis result data S0 on the target lattice point is May be calculated by performing the above calculation.

Further, the process in the above step is a process of calculating a weighted average of the analysis result data at each grid point and the distance to the vertex of the target polygon.

Therefore, the analysis result data on the lattice points of the structured grid can be obtained by performing the determination and processing of the steps, and then, by repeating the determination and processing up to the step, each of the polygons constituting the obstacle can be obtained. Analysis result data at the vertices can be obtained. After that, by repeating the processing of the step, information result data at points other than the vertices can be obtained. Based on the obtained analysis result data, contour lines are formed on obstacles formed of a plurality of polygons. Can be displayed, and the analysis results can be remarkably viewed.

However, instead of displaying the contour lines, the analysis result data can be made to correspond to the color specified in advance,
Contour display can be achieved.

<Embodiment 2> FIG. 4 is a block diagram showing an embodiment of a fluid analysis result display device according to the present invention, in which fluid analysis data obtained by performing fluid analysis is data on lattice points of a structural lattice. The discriminating unit (1) for discriminating whether the data is on the center point of the structured grid or not and the discriminating unit (1) indicating that the data is on the center point of the structured grid are supplied. Is performed on the basis of the analysis result data on the center point of the adjacent structured grid under the condition that the analysis result data on the grid point is obtained, and the determination unit (1) indicating that the data is on the grid point
A first analysis result data calculation unit (2) that outputs the analysis result data as it is under the condition that the determination result is supplied, and sequentially selects each vertex of a plurality of polygons defined to define an obstacle A vertex selecting unit (3), a structured grid detecting unit (4) for detecting a structured grid to which the selected vertex belongs, and a selected vertex on a grid point, a ridge line, or a plane of the detected structured grid. Or a determination unit (5) for determining which position is located inside, and a corresponding operation is performed based on the determination result from the determination unit (5) to calculate analysis result data on the corresponding vertex. The second analysis result data calculation unit (6) and the obstacle shape data defined by the plurality of polygons are selected as obstacle display data instead of the obstacle shape data obtained based on the fluid occupancy. Obstacle display data A data selecting unit (7), an analysis result allocating unit (8) for allocating the analysis result data obtained by the interpolation operation to each vertex of the selected obstacle display data, and an analysis result data on the corresponding vertex. An interpolation operation unit (9) that performs an interpolation operation based on the data to obtain analysis result data on points other than the vertices; and a second analysis result data calculation unit (6) and an interpolation operation unit (6) on the selected obstacle display data. An analysis result display unit (10) for displaying the analysis result data obtained in 9), a vertex selection unit (3), a structured grid detection unit (4), a discrimination unit (5), and a vertex selection unit for each vertex of each polygon. (2) a control section (11) for repeatedly operating the analysis result data calculation section (6).

The operation of the analysis result data display device having the above configuration is as follows.

The determination unit (1) determines whether or not the analysis result data obtained by performing the fluid analysis is the data on the lattice points of the structural lattice. If the data is not the data on the lattice points, the first analysis result is obtained. The analysis result data on the grid points is obtained by the data calculation unit (2).

Next, the structural grid to which each vertex of the plurality of polygons defining the obstacle belongs is detected by the structural grid detector (4), and the positional relationship with respect to the structural grid is determined by the determiner (5). The second analysis result data calculation unit (6) performs a predetermined operation based on the relationship to calculate analysis result data on the vertices of the polygon.

After the analysis result data on all vertices is obtained, the obstacle display data selection unit (7) defines a plurality of polygons instead of the obstacle shape data obtained based on the fluid occupancy. The shape data of the obstacle is selected as the obstacle display data, the analysis result allocating unit (8) allocates the analysis result data obtained by the above calculation to each vertex of the selected obstacle display data, and interpolates the data. According to (9), an interpolation operation is performed based on the analysis result data on the corresponding vertex to obtain analysis result data on points other than the vertex.
Then, the analysis result display unit (10) places the second analysis result data calculation unit (6) on the selected obstacle display data.
And the analysis result data obtained by the interpolation calculation unit (9).

As a result, the analysis result data can be displayed not on the obstacle obtained based on the fluid occupancy but on the obstacle created by the modeler, and the recognition of the analysis result can be significantly facilitated.

Note that the present invention is not limited to the above-described embodiment. For example, analysis result data on grid points of a structural grid located inside an obstacle created by a modeler is perpendicular to the surface of the obstacle. By performing interpolation calculation in the direction, it is possible to obtain analysis result data on the surface of the obstacle and display it on the surface of the obstacle created by the modeler,
Various design changes can be made without departing from the scope of the present invention.

<Effect of the Invention> The first invention adopts obstacle shape data defined by a plurality of polygons as obstacle display data instead of obstacle shape data obtained based on a fluid occupancy,
By calculating and displaying the analysis result data on the adopted obstacle display data at the same time, there is a unique effect that the correlation between the analysis result data and the actual obstacle can be displayed in a remarkably easy to recognize state.

The second invention adopts obstacle shape data defined by a plurality of polygons as obstacle display data instead of obstacle shape data obtained based on the fluid occupancy,
Calculate the analysis result data on the vertices of the polygon that constitutes the adopted obstacle display data, calculate the analysis result data on points other than the vertices based on the calculated analysis result data, and display them simultaneously. Accordingly, a unique effect is provided in that the correlation between the analysis result data and the actual obstacle can be displayed in a state in which it is extremely easy to recognize.

The invention of FIG. 3 adopts obstacle shape data defined by a plurality of polygons as obstacle display data instead of obstacle shape data obtained based on the fluid occupancy, and employs the adopted obstacle. By calculating and displaying the analysis result data on the object display data at the same time, there is a unique effect that the correlation between the analysis result data and the actual obstacle can be displayed in a state in which it is extremely easy to recognize.

A fourth invention adopts, as obstacle display data, obstacle shape data defined by a plurality of polygons instead of obstacle shape data obtained based on the fluid occupancy rate,
Calculate the analysis result data on the vertices of the polygon that constitutes the adopted obstacle display data, calculate the analysis result data on points other than the vertices based on the calculated analysis result data, and display them simultaneously. Accordingly, a unique effect is provided in that the correlation between the analysis result data and the actual obstacle can be displayed in a state where it is extremely easy to confirm.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of a fluid analysis result display method according to the present invention, and FIGS. 2 (A) to 2 (C) are views for explaining processing for obtaining analysis result data on grid points of a structured grid. 3 is a diagram schematically showing the configuration of a fluid analysis system to which the fluid analysis result display method of the present invention is applied, FIG. 4 is a block diagram showing one embodiment of a fluid analysis result display device of the present invention, and FIG. FIG. 1 is a diagram schematically showing a configuration of a conventional fluid analysis system, and FIG. 6 is a diagram for explaining inconvenience of a conventional analysis result display method. (6) ... second analysis result data calculation unit (7) ... obstacle display data selection unit (8) ... analysis result assignment unit (9) ... interpolation calculation unit (10) ... analysis Result display part, (25) …… Fluid analysis program

Claims (4)

(57) [Claims] An analysis result data on a grid point is obtained by performing fluid analysis by a difference method using an orthogonal coordinate system based on shape data of an obstacle defined by a plurality of polygons, and obtaining analysis result data. By performing an interpolation operation based on the above, analysis result data on the surface of the obstacle defined by the plurality of polygons is obtained, and shape data of the obstacle defined by the plurality of polygons is obtained based on the fluid occupancy. A fluid analysis result display method, which employs obstacle display data instead of the obstacle shape data, and displays the analysis result data on the adopted obstacle display data. 2. An analysis result data on a grid point is obtained by performing fluid analysis by a difference method using an orthogonal coordinate system based on shape data of an obstacle defined by a plurality of polygons, and obtaining analysis result data. By performing an interpolation operation based on the analysis result data at the vertices of each polygon, the shape data of the obstacle defined by the plurality of polygons is replaced with the shape data of the obstacle obtained based on the fluid occupancy. Adopted as obstacle display data, display the analysis result data obtained by the above interpolation operation on each vertex of the adopted obstacle display data, and on points other than the vertex, to the analysis result data on the corresponding vertex A fluid analysis result display method, comprising displaying analysis result data obtained by performing an interpolation operation based on the data. 3. A fluid analysis means for performing fluid analysis by a difference method using an orthogonal coordinate system based on shape data of an obstacle defined by a plurality of polygons to obtain analysis result data on grid points. ) And interpolation calculation means (6) and (9) for obtaining analysis result data on the surface of the obstacle defined by the plurality of polygons by performing an interpolation calculation based on the obtained analysis result data. Obstacle display data selecting means (7) for selecting shape data of an obstacle defined by a square as obstacle display data instead of the shape data of the obstacle obtained based on the fluid occupancy; A fluid analysis result display device comprising: an analysis result display means (10) for displaying the analysis result data on object display data. 4. A fluid analysis means for performing fluid analysis by a difference method using an orthogonal coordinate system based on shape data of an obstacle defined by a plurality of polygons to obtain analysis result data on grid points. ), First interpolation calculation means (6) for obtaining analysis result data at the vertices of each polygon by performing an interpolation calculation based on the analysis result data, and shape data of an obstacle defined by a plurality of polygons. Obstacle display data selection means (7) for adopting as obstacle display data instead of obstacle shape data obtained based on the fluid occupancy
An analysis result allocating means (8) for allocating the analysis result data obtained by the above-described interpolation operation to each vertex of the selected obstacle display data, and performing an interpolation operation based on the analysis result data on the corresponding vertex. A second interpolation calculating means (9) for obtaining analysis result data on points other than the vertices; and a first interpolation calculating means (6) and a second interpolation calculating means (9) on the selected obstacle display data. Analysis result display means (10) for displaying the obtained analysis result data.