JPH09305651A - Analysis simulation device and its high-speed display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an analysis simulation device being superior in interactive property and responsiveness, where even the analysis result of a large scale of analysis simulation can be displayed in a terminal screen at high speed. SOLUTION: An analysis post-processor 103 is provided with a display mesh generating part 104 for generating display mesh data which is different from and more rough than a mesh used for analysis in order to it in the display of an analysis result. A display analysis result generating part 105 does not depend on the data quantity of an analysis mesh based on the display mesh, displays the analysis result by lesser quantity of analysis result display data and displays the stable analysis result at high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analysis simulation apparatus for performing an analysis simulation using a computer and displaying the analysis result on a display, and in particular, displays the analysis result in a large-scale analysis on a display at high speed. The present invention relates to a possible analysis simulation device and a method of displaying the analysis result.

[0002]

2. Description of the Related Art With the recent development of computer technology,
Various analysis simulation devices that perform structural analysis, heat conduction analysis, wave analysis, and electromagnetic analysis using the finite element method, the difference method, and the like are known and put into practical use. For example, according to the three-dimensional HICAD / CADAS / WX product manual (Hitachi, Ltd.), the analysis mesh data created by the analysis preprocessor and the finite element method or the difference method based on the analysis mesh are used. The calculated analysis result data and the analysis post-processor are input and displayed on the terminal screen of the apparatus. The analysis result data is added to the nodes and elements that form the analysis mesh as the values of physical quantities such as stress and displacement.

Further, according to the "method for displaying three-dimensional analysis data as a figure" known from Japanese Patent Laid-Open No. 2-197965, it is particularly easy to understand the three-dimensional analysis data regarding the analysis result display method inside the object. In order to display it graphically, the shape of the three-dimensional area is displayed on the display, and in this shape, the cross section is defined by moving the cursor. This makes it possible to specify the analysis result display cross section by a simple and easy method of moving the cursor on the display instead of the troublesome cross section specification method such as the numerical calculation of the cross section in the prior art. By eliminating this, anyone can easily understand the three-dimensional phenomenon in a short period of time.

[0004]

As described above, according to the above-mentioned conventional technique, the mesh used for display is the same as the analysis mesh created for use in the analysis calculation by the analysis post processor. Specifically, the stress values of the nodes that make up the finite element are interpolated using a shape function, and a contour diagram of the stress is displayed on the analysis mesh (contour map, etc., for example, a diagram in which the stress distribution is displayed in different colors). , Or the displacement amount of each node is added to the coordinate value of the node to display the deformation diagram of the analysis mesh. Further, as known from Japanese Patent Laid-Open No. 2-197965, when displaying a physical quantity inside an object,
It has been performed that a cutting plane is specified and a physical quantity is displayed on a mesh where the cutting plane intersects the analysis mesh.

In the above-described post-processor for displaying the analysis result, however, when the analysis scale becomes large, it takes a huge amount of time to display the analysis result, so that the interactivity and responsiveness of the system are increased. There was a problem that was worse. Furthermore, to display the analysis results for the entire analysis target, all analysis mesh data and analysis result data are required. For large-scale analysis, for example, it is necessary to retrieve those data from the database at once. However, there were cases where the entire analysis results could not be displayed. In particular, in the case of structural analysis in which a complex structure is divided into many blocks and calculated in parallel for each block, or in the case of fluid analysis in which a large amount of analysis result data is output at each time step, the above-mentioned problems Is happening.

Regarding the display of the analysis result inside the object, as described above, the mesh for display is conventionally generated by cutting the analysis mesh.
However, with this method, since the density of the display mesh depends on the density of the analysis mesh, it is not possible to generate a coarse display mesh for speeding up the display. It takes a huge amount of time to display the results, which deteriorates the interactivity and responsiveness of the system. Also, when the surface of the three-dimensional area is used as the display surface, particularly when trying to observe it from various angles while rotating it,
Since it takes time to display the analysis result, the speed of rotation of the displayed object to be analyzed becomes slow, and it is impossible to rotate the object as the user desires, making it difficult to see. It was

The present invention has been made in order to solve the above problems in the prior art, and the purpose thereof is not to depend on the analysis scale, that is, despite the increase of the analysis scale, It is an object of the present invention to provide an analysis simulation apparatus and a high-speed display method that can always perform display processing at high speed and stably and can obtain stable interactivity and responsiveness.

[0008]

In order to achieve the above object, according to the present invention, first, an input / output device including at least a display and an input means, and an analysis mesh based on a shape model of an input analysis target. An analysis preprocessor unit that generates data, an analysis program unit that performs analysis calculation using the generated analysis mesh data, and outputs analysis result data, and an analysis result using the analysis result data. In an analysis simulation device including an analysis post processor unit displayed on a display screen of an output device, the analysis post processor unit is further used to display the output analysis result from the analysis target shape model. For display, which is coarser than the analysis mesh generated by the analysis preprocessor. Comprises means for generating a chromatography data, the data of the calculated analysis result by the analysis mesh data and to display based on the display mesh data analysis simulation device is proposed.

Further, in order to achieve the above object, according to the present invention, a geometric model to be analyzed is input,
Generate analysis mesh data from the input geometric model of the analysis target, perform analysis calculation using the analysis mesh data, output the analysis result data, and further use the analysis result data to analyze the analysis result. In an analysis simulation for displaying on a display screen, since it is used to display the output analysis result, a coarser display mesh data different from the generated analysis mesh is generated and calculated by the analysis mesh data. A high-speed display method of the analysis simulation is proposed in which the displayed analysis result data is displayed by the display mesh data.

As a result, the display speed of the analysis result depends on only the data amount of the display mesh because the analysis result data is displayed based on a coarser display mesh different from the analysis mesh. Becomes, for example,
Even if there is a large amount of analysis mesh data or analysis result data, such as in large-scale analysis, a stable and high-speed display is possible by processing a smaller amount of data regardless of the amount of data. .

That is, as will be described in detail below, in the analysis simulation apparatus and its high-speed display method of the present invention, first, the user activates the analysis preprocessor and uses the input device such as a mouse or keyboard to analyze the object. Input the shape model of. Then, an analysis mesh is created based on the input shape model, and the shape model data and the analysis mesh data are stored in the database. next,
When the user gives an instruction to execute the analysis, the analysis program is started. In this analysis program, the analysis mesh data created by the analysis preprocessor is extracted from the database, and after the analysis calculation is completed, the data of the analysis result is stored in the database. Further, in the analysis post processor, first, the data of the shape model to be analyzed is taken out from the database, the display mesh data of the area designated by the user is generated with a coarser mesh different from the above analysis mesh, and the Store the data in the database. Next, the analysis mesh data and the analysis result data are retrieved from the database, the analysis results are mapped to the nodes of the display mesh, the display analysis result data is generated, and the display mesh data and the display analysis result data are generated. The analysis results are displayed on the terminal screen using a contour diagram.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. (1) Overall system configuration of the present embodiment: FIG. 1 shows the overall system configuration of an analysis simulation apparatus according to an embodiment of the present invention. That is, the analysis simulation apparatus is configured by a computer system including a storage unit that constitutes a database, and as is clear from the figure, basically, the analysis preprocessor 101.
And an analysis program 102, an analysis post processor 103, a database 107, and an input / output device 108.

In the overall system configuration, the analysis preprocessor 101 inputs a shape model to be analyzed and analysis conditions and creates an analysis mesh model. The analysis program 102 inputs the analysis mesh data and outputs the analysis result data. Further, the analysis post processor 103 inputs the analysis result data from the analysis program 102 and displays the analysis result on the terminal screen of the input / output device which will be described below. further,
The database 107 stores data such as shape models, meshes, and analysis results used for analysis simulation, and the input / output device 108 is, for example, a keyboard,
It is composed of a mouse, a display, etc., and the user inputs data via these keyboard and mouse, and displays the output on the display which constitutes the terminal screen.

Further, the analysis post-processor 103, which characterizes the present invention, creates mesh data of a display mesh to be displayed on the terminal screen based on the analysis result, that is, a so-called display mesh generation unit 104.
And a display analysis result generation unit 10 which is a means for mapping the analysis result from the analysis mesh to the display mesh.
5, and a so-called analysis result display unit for displaying the analysis result on the terminal screen, that is, the display of the input / output device 108 by using the display mesh data and the display analysis result data. And 106.

(2) Processing content and data flow of each program: Next, the processing of each program shown in FIG. 1 and the data flow of the entire system of the analysis simulation apparatus will be described with reference to FIG. Note that FIG.
Is the database 107 and each program, that is, the analysis preprocessor 101 and the analysis program 10.
2 is a data input / output diagram between the display mesh generation unit 104, the display analysis result generation unit 105, and the analysis result display unit 106 of the analysis post processor 103.

In the configuration of the analysis simulation device shown in FIG. 1, first, the analysis preprocessor 101.
Then, the user inputs the shape model to be analyzed using the input / output device 108, that is, the keyboard and the mouse, and stores the data of the input shape model in the database 107. Further, the analysis preprocessor 101 divides the shape model into analysis meshes, and also stores the analysis mesh data in the database 107.
At this time, since the density of the analysis mesh affects the analysis accuracy, the user needs to finely set the mesh according to the accuracy required. As a method of dividing into meshes, for example, a method of dividing the shape model to be divided into blocks of hexahedron in advance, and further subdividing the block group into a grid to create an analysis mesh composed of hexahedral elements, or , When generating a mesh using the automatic mesh division method, first, the node group is automatically arranged on the surface of the target shape, and the surface of the shape is divided by the non-overlapping triangle groups having these nodes as vertices. Then
Furthermore, the method of arranging nodes inside the shape, having all the triangles of the surface of the shape on the surface, and generating an analysis mesh composed of non-overlapping tetrahedral elements with the nodes inside the shape as vertices is also adopted. be able to. In this latter case, when the tetrahedral element formed on the surface portion is removed, the surface becomes a surface having irregularities in general, so that these are regarded as surface triangles and the division is repeated in the same manner.

In FIG. 3 attached herewith, the above-mentioned shape model to be divided is divided into blocks of hexahedron in advance, and the block group is further subdivided into a grid to form an analysis mesh composed of hexahedral elements. An example of the division by the method is shown in FIG. 4, which is the latter described above, that is, the group of nodes is automatically arranged on the surface of the target shape, and the groups of triangles having these nodes as vertices do not overlap each other. An example of a method of dividing the surface of the shape is shown.

In this way, the analysis preprocessor 1
In 01, the geometric model to be analyzed is divided into analysis meshes and stored in the database 107. Then, the analysis program 102 inputs the analysis mesh data from the database 107 and executes the finite element method, the difference method, etc. After performing the analysis calculation using the data, the data of the analysis result is stored in the database 107 again. Specifically, in the case of structural analysis, data of stress and displacement are output as analysis results, and in the case of fluid analysis, data such as flow velocity vector and pressure distribution are output. The data of this analysis result is
When storing in the database 107, each integration point,
It will be stored in the database as a value for each node and each element.

Next, the analysis post processor 103 is used.
The display mesh generation unit 104 inputs the shape data from the database 107 and displays the shape data on the display of the input / output device 108, which is a terminal screen. Here, the user designates the area in which the analysis result is to be displayed by the shape model on the display screen of the display, and the analysis preprocessor 1 described above is specified for the area.
Similar to 01, a display mesh is generated. It should be noted that the display mesh may be a coarse mesh as compared with the analysis mesh by the analysis preprocessor 101.

A method of designating the area for generating the display mesh will be described with reference to FIGS. 5 to 8 attached herewith. First, FIG. 5 shows a case in which the entire shape model to be analyzed is used as the display area. Here, the user inputs the element dimensions of the display mesh, thereby automatically generating tetrahedral elements in the entire shape. It is an example. Further, FIG. 6 shows a case where one plane of the shape model to be analyzed, that is, the plane 1 is used as the display area, and the plane 1 which is the display area is indicated by an arrow that moves on the display screen with a mouse or the like. This is an example in which a triangular element is generated on the surface 1 by designating.

Further, FIG. 7 shows a case where a cut surface obtained by cutting the shape model to be analyzed is used as the display area.
This is an example in which this cut surface is input and triangular elements are generated on the cut surface of the shape model calculated by this. And
FIG. 8 shows a case where a common area between the shape model to be analyzed and the three-dimensional designated area (in this case, a cube) is used as the display area, and an example in which a hexahedral element is generated for the common area. .

In the above, as a method of designating the area for generating the display mesh, the entire shape model to be analyzed (FIG. 5), one of the surfaces (FIG. 6), and the cut surface (FIG. 7) and the case where the common part (FIG. 8) is used as the display area has been described, however, the method of designating this display area is not limited to these, and when the display area is a curved surface, By calculating the radius of curvature of the display area and controlling the density of the mesh according to the distribution, it is possible to perform display with a high shape approximation to the desired display area. Further, in the method of designating the area for generating the display mesh, the density of the display mesh has been described as the user inputting the element dimensions of the display mesh, but instead of this, for example, the analysis result According to the distribution or the distribution of the gradient of the analysis result, by controlling the density of the display mesh, or by providing a means for partially controlling the density of the display mesh, it is suitable for display. It is possible to display analysis results with high accuracy. In addition, regarding the setting of the density of this display mesh, by setting the upper limit of the data amount of the display mesh according to the display performance and memory of the computer that performs the display process, as well as its disk capacity, etc. It is possible to stabilize the processing time. In addition, regarding the above-mentioned coarse and dense display meshes, for example, in the case of the automatic generation of the tetrahedral elements shown in FIG. 5, the arrangement and distribution density of the nodes are set according to the distribution of the tetrahedral elements. By doing so, the density of the mesh can be controlled. The display mesh generated as described above is the same as the database 10 described above.
7 will be stored.

Subsequently, the analysis post processor 10 is used.
In the display analysis result generation unit 105 that constitutes No. 3, in addition to the analysis mesh data and the analysis result data, the display mesh data generated as described above is input from the database 107. That is, the analysis result given to each node of the analysis mesh is obtained from the input analysis mesh data and the analysis result data, and further, the display at each node of the display mesh is obtained from the input display mesh data. Use analysis result data is obtained and stored in the database 107.

Here, a method for obtaining display analysis result data at each node of the display mesh will be described with reference to FIGS. 9 and 10 attached herewith. First, the calculation principle will be described. When obtaining the analysis result data for display at the node n1 of the display mesh shown in FIG. 9B, the above-mentioned node n1 in the analysis mesh shown in FIG. The element E1 including the element E1 is searched, and further the nodes N1, N2, N3 of the analysis mesh forming the element E1 and the physical quantities W1, W2, W3 corresponding to these nodes are searched.

Subsequently, as shown in FIG. 10 in which the element E1 is enlarged and displayed, the physical quantity w1 of the node n1 to be obtained is obtained.
Using the shape function of the element E1, the physical quantities W1, W2,
W3 is interpolated. For example, when the shape function of the isoparametric element is used, the area coordinates (L1, L2, L3) of the node n1 in the triangular element composed of the nodes N1, N2, N3 in the analysis mesh are obtained, and By the formula, the node n in the above display mesh
The physical quantity w1 of 1 can be obtained.

[Formula 1] w1 = L1 × W1 + L2 × W2 + L3 × W3

FIG. 11 shows in detail the algorithm in the method for obtaining the above-mentioned display analysis result data. When the process is started, first, the node ni in the display mesh (see FIG. 9B) is searched from the display mesh data once read from the database 107 (step S11). Subsequently, again, from the analysis mesh data read from the database 107, an element Ej including the node ni is searched for in the analysis mesh (see FIG. 9A) (step S12). ). The nodes N1, N2 of the analysis mesh forming the triangular element Ej thus obtained are
N3 and physical quantities W1, W2, W3 at each of these nodes
Is also searched from the analysis result data read from the database 107 (step S13). After that, the area coordinates (L
1, L2, L3) is calculated (step S14), and the physical quantity W1 at the node ni of the display mesh is calculated by the above equation (Equation 1) (step S15). The above processing is performed for all nodes ni (i
= 1 to m: m = natural number), and the physical quantity W1 is applied to all the nodes ni of the display mesh.
Is completed (step S16), and the process ends.

In the above embodiments, the analysis mesh data and the analysis result data are read from the database 107 into the storage device (memory) in the computer and then retrieved. However, when the analysis mesh data and the analysis result data have an enormous amount of data, such as in a large-scale analysis, only the area including the display mesh is stored in the analysis mesh from the database 107. It is also possible to retrieve and process the data and the data of the analysis result. In this way, by extracting and processing the analysis mesh data and the analysis result data only for the area including the display mesh, the processing shown in FIG. 11 can be performed at a higher speed.

Further, the analysis post processor 10 is used.
In the analysis result display unit 106 of No. 3, the database 1
From 07, the display mesh data divided and stored by the analysis preprocessor 101 and the display analysis result data calculated by the display analysis result generation unit 105 of the analysis post processor 103 are input, and the user inputs The analysis result regarding the specified display area is displayed on the display which is the terminal screen. As a method of displaying the analysis result on the display mesh displayed on this screen, a method of calculating the physical quantity in each element by the above-mentioned shape function by interpolation and drawing a contour map or the like regarding the physical quantity is considered. To be

As described above, according to the analysis simulation apparatus according to the embodiment of the present invention described in detail above, the data necessary for displaying the analysis result regarding the analysis target,
That is, the data of the display mesh and the analysis result for display are the data necessary for the analysis, that is, different from the data of the so-called analysis mesh and the analysis result, the data amount is the amount of the analysis mesh and the analysis result. Remarkably less than the data. Therefore, despite the increase in analysis scale due to large-scale analysis, the processing time and data display time required to display the analysis result are shortened. In addition, the system can be stably performed, and further, stable and good interactivity and responsiveness as the system can be obtained.

Further, particularly when the shape of the entire analysis target is used as the display area, the display mesh generating section 10 is used.
4 only by designating the roughness of the display mesh, the display analysis result generation unit 105 and the analysis result display unit 1
Since the processing up to 06 can be automatically performed via the database 107, the process from the start of the analysis program 102 to the generation of the display mesh and the data of the display analysis result is consistent and interactive. It can be processed without requiring any special operation. further,
Since the user can generate a display mesh by instructing only the portion for which the analysis result is desired to be evaluated, it is easy to use and the analysis result can be displayed at higher speed.

[0031]

As is apparent from the above detailed description, according to the analysis simulation apparatus and the high-speed display method of the present invention, the display time of the analysis result depends only on the data amount of the display mesh. Therefore, even when the analysis result of a large-scale analysis simulation is displayed on the terminal screen, it can be displayed at high speed without deteriorating the interactivity and responsiveness, which is technically excellent. Be effective.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an analysis simulation device according to an embodiment of the present invention.

FIG. 2 is a data flow diagram for explaining a data flow in the analysis simulation device.

FIG. 3 is an explanatory diagram showing generation of a hexahedral mesh which is an example of an analysis mesh.

FIG. 4 is an explanatory diagram showing generation of a tetrahedral mesh which is an example of an analysis mesh.

FIG. 5 is an explanatory diagram showing an example of generation of a display mesh.

FIG. 6 is an explanatory diagram showing another example of generation of a display mesh.

FIG. 7 is an explanatory diagram showing still another example of display mesh generation.

FIG. 8 is an explanatory diagram showing an example of generation of a display mesh by a three-dimensional designated area.

FIG. 9 is an explanatory diagram illustrating a method of generating a display analysis result.

FIG. 10 is an explanatory diagram illustrating the principle of an analysis result mapping method.

FIG. 11 is a flowchart showing an algorithm for generating a display analysis result.

[Explanation of symbols]

 101 Analysis Preprocessor 102 Analysis Program 103 Analysis Post Processor 104 Display Mesh Generation Unit 105 Display Analysis Result Generation Unit 106 Analysis Result Display Unit 107 Database 108 Input / Output Device

Front page continuation (72) Inventor Rikuro Takahashi 890 Kashimada, Sachi-ku, Kawasaki-shi, Kanagawa Hitachi Information Systems Division, Hitachi Ltd.

Claims (12)

[Claims] 1. An input / output device including at least a display and an input means, an analysis preprocessor unit for generating analysis mesh data from an input geometric model of an analysis target, and using the generated analysis mesh data. An analysis simulation device including an analysis program unit that performs analysis calculation and outputs analysis result data, and an analysis postprocessor unit that displays the analysis result on the display screen of the input / output device using the analysis result data. In the above, the analysis post processor unit further includes
From the shape model of the analysis target, a unit for generating display mesh data coarser than the analysis mesh generated by the analysis preprocessor unit for use in displaying the output analysis result is provided. An analysis simulation device, characterized in that analysis result data calculated from mesh data is displayed based on the display mesh data. 2. The analysis simulation apparatus according to claim 1, wherein the display mesh data generating means constituting the analysis post-processor section displays the whole or a part of the shape model to be analyzed. An analysis simulation device characterized by automatically generating mesh data for use. 3. The analysis simulation apparatus according to claim 1, wherein the display mesh data generating means forming the analysis post-processor section further specifies a portion for generating display mesh data. An analysis simulation device comprising means for designating the shape model displayed on the display screen of the input / output device. 4. The analysis simulation apparatus according to claim 1, wherein the display mesh data generation unit that generates the display mesh data further includes the analysis target shape model that generates the display mesh data. An analysis simulation device, wherein a means for partially controlling the density of the display mesh is provided. 5. The analysis simulation apparatus according to claim 1, wherein the display mesh data generation unit that generates the display mesh data further includes the analysis target shape model that generates the display mesh data. An analysis simulation apparatus comprising means for controlling the density of the display mesh according to the distribution of the radius of curvature of the shape. 6. The analysis simulation apparatus according to claim 1, wherein the display mesh data generating means for generating the display mesh data further responds to a distribution of the analysis results or a distribution of gradients of the analysis results. And a means for controlling the density of the display mesh, the analysis simulation apparatus. 7. The analysis simulation device according to claim 1, wherein the analysis post-processor unit further uses the analysis mesh data and the analysis result data to display the analysis result in the display mesh data. An analysis simulation device comprising means for mapping the data of 1. 8. The analysis simulation apparatus according to claim 1, further comprising at least the analysis mesh data generated by the analysis preprocessor section and analysis result data output from the analysis program section. An analysis simulation device having a database for storing. 9. The analysis simulation apparatus according to claim 8, wherein the analysis post-processor unit includes the analysis mesh data including the nodes of the display mesh therein and the analysis result data regarding the portion. An analysis simulation device comprising means for extracting the analysis result from the database and mapping the analysis result onto the display mesh. 10. An analysis target geometric model is input, analysis mesh data is generated from the input analysis target geometric model, analysis calculation is performed using the analysis mesh data, and analysis result data is output. In addition, in the analysis simulation in which the analysis result is displayed on the display screen by using the data of the analysis result, since it is used for displaying the output analysis result, a rougher display different from the generated analysis mesh is displayed. A high-speed display method of an analysis simulation, characterized in that the mesh data for generation is generated and the data of the analysis result calculated by the mesh data for analysis is displayed by the mesh data for display. 11. The high-speed display method of the analysis simulation according to claim 10, wherein when the data of the analysis result calculated by the analysis mesh data is displayed based on the display mesh data, the display is performed. A high-speed display method for analysis simulation, wherein only the analysis mesh data including the nodes of the use mesh and the analysis result data relating to the portion are taken out and the analysis result is mapped to the display mesh. 12. The high-speed display method of analysis simulation according to claim 10, wherein when displaying the analysis result data calculated from the analysis mesh data based on the display mesh data, the display is performed. A method for high-speed display of an analysis simulation, characterized by using the shape function of the analysis mesh element that internally includes the nodes of the analysis mesh to interpolate and obtain the data of the analysis result regarding the part.