JPH02143167A - Flow velocity vector display system - Google Patents

Abstract

PURPOSE:To display a three-dimensional flow velocity vector distribution in an easily understandable manner by displaying a flow velocity vector on a plane of projection and displaying the flow velocity component in the direction perpendicular to the projection surface as well by a different system. CONSTITUTION:The flow velocity vector V is displayed in various densities as the two-dimensional vector Vxy the X-Y surface of which is used as the plane of projection. The vector component Vz perpendicular to the X-Y surface is displayed simultaneously with the vector Vxy by the system different from the system for the vector Vxy by the pale color, intermediate color, dark color, etc., respectively corresponding to the vector component Vz=0, the vector Vznot equal to 0, the vector Vxy. The three-dimensional flow velocity vector distribution is displayed in the easily understandable manner by this display.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flow velocity vector display method,
It is used for displaying three-dimensional flow velocity vectors in each part of a fluid on a plane.

[Prior Art] Conventionally, as a method for displaying three-dimensional vectors on a plane, three-dimensional vectors V are displayed in the three-axis directions of the X-axis, Y-axis, and Z-axis, as shown in FIG. Each velocity component V x ,
A common method is to decompose it into V y and V z and represent them in a perspective view. Furthermore, as shown in FIGS. 5(a) and 5(b), the three-dimensional vector
Displays only the projected vector Vxy projected onto a plane (Y plane, etc.), and the velocity component in the direction perpendicular to that plane is displayed on another plane (for example, Y plane).
There is a method of displaying a projection view onto the Z plane).

[Problem to be Solved by the Invention] However, when displaying the distribution of flow velocity vectors in each part of the fluid, the display method shown in Fig. 4 has a problem in that the number of arrows becomes too large and it becomes difficult to see. be. Also, if the flow velocity vector is decomposed into three axes of components, Vy and Vz, when you want to mainly observe the flow within an arbitrary cross section, it is easy to synthesize the flow within that cross section in your head. Instead, there is a problem that the display becomes difficult to understand. On the other hand, Fig. 5 (a) and (b)
As shown in Figure 2, the method of displaying the projected vector onto an arbitrary cross section is very easy to understand the flow velocity distribution within that cross section, and is currently widely used when displaying the results of experimental measurements and numerical flow analysis. It is being However, in this case,
Velocity components in the direction perpendicular to the cross section are not shown at all, so in order to understand the three-dimensional flow velocity distribution, it is necessary to also observe the projection diagram of the plane perpendicular to the cross section and visualize it in your head. It was necessary to synthesize three-dimensional vectors.

The present invention has been made in view of these points, and an object thereof is to provide a flow velocity vector display method that can display a three-dimensional flow velocity distribution in an easily understandable manner.

[Means for Solving the Problems] In order to solve the above problems, the flow velocity vector display method according to the present invention displays a three-dimensional flow velocity vector on an arbitrary plane, as shown in FIG. It is characterized by displaying the projected two-dimensional projection vector on a plane, and displaying the velocity component in the direction perpendicular to the projection plane on the same plane, distinguishing it from the velocity component within the projection plane. .

Methods for distinguishing velocity components in a direction perpendicular to the projection plane from velocity components within the projection plane include, for example, the color tone, shading, or thickness of the projection vector line segment or arrow, or the size or opening angle of the arrow. There is a way to differentiate. Further, the projection vector may be displayed using a vector different in color tone or line type.

[Operation] In this way, in the present invention, when displaying a three-dimensional flow of fluid, the flow in a plane to be observed is mainly expressed by projecting the flow velocity vector into that plane, and the projection plane is Because the velocity component in the perpendicular direction is distinguished from the velocity component in the projection plane and displayed on the same plane, it is possible to understand the three-dimensional flow while observing the flow in any plane. be able to.

〔Example] Figure ylc1 is an explanatory diagram showing one embodiment of the present invention.

In this embodiment, a projection vector Vx is obtained by projecting a three-dimensional vector V onto an arbitrary plane (for example, an XY plane).
y is displayed, and the velocity component Vz in the direction perpendicular to that plane is displayed as the shading of the projection vector Vxy. As shown on the right side of Figure 1, Vz≦-1°5, 1.5<Vz<=
0.5, -〇, 5≦Vz≦+0.5, +0.5<Vz<
+1. ．． 5. The shading of the projection vector Vxy differs depending on each case of +1.5≦Vz. Here, since the projection vector Vxy is a filled line, it can be seen that the velocity component Vz in the Z-axis direction is +1.5 or more.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention. In this embodiment, the proximal end portion of the projection vector Vxy has a density corresponding to the velocity component Vz=O, and the projection vector Vxy
The leading end of the projection vector Vxy has a density corresponding to the velocity of the projection vector Vxy itself, and the middle part of the projection vector Vxy has a density corresponding to the velocity of the vertical velocity component Vz. In this way, by observing the density ratio of the middle part to the tip part, the length of the vector obtained by projecting the three-dimensional vector V onto the Z axis can be grasped as the ratio to the length of the projected vector Vxy. Can be done.

In addition, in FIGS. 1 and 2, the vertical velocity component Vz
is displayed by the shading of the line segment of the projection vector Vxy,
In addition, it is also possible to display the color tone and thickness of the line segments or arrows that make up the vector, or the size and opening angle of the arrows.

FIG. 3 is an explanatory diagram showing still another embodiment of the present invention. In this embodiment, a three-dimensional vector
For example, a projection vector Vxy projected onto an XY plane) is displayed, and a velocity component in a direction perpendicular to the plane is displayed as the length of a vector Vz perpendicular to the projection vector Vxy.

The projection vector y and the vertical vector Vz can be distinguished by changing the color tone or line type.

[Effects of the Invention] According to the present invention, a three-dimensional flow velocity vector is projected onto an arbitrary plane, and the flow within the plane can be detected by the projected vector, and the velocity in a direction perpendicular to the plane can be detected. Since the components are displayed in the same plane, there is an effect that the flow velocity vector can be grasped three-dimensionally while observing the flow in the plane.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is an explanatory diagram of another embodiment of the present invention, Fig. 3 is an explanatory diagram of yet another embodiment of the invention, and Fig. 4 is an explanatory diagram of a conventional embodiment. Example illustration, Figure 5(a)
, (b) is an explanatory diagram of another conventional example. (2) is a flow velocity vector, and vxy is a projection vector.

Claims (3)

[Claims] (1) A two-dimensional projection vector obtained by projecting a three-dimensional flow velocity vector onto an arbitrary plane is displayed on the plane, and the velocity component in the direction perpendicular to the projection plane is distinguished from the velocity component within the projection plane. A flow velocity vector display method characterized by displaying them on the same plane. (2) It is characterized by displaying the magnitude of the velocity in the velocity component in the direction perpendicular to the projection plane by the color tone, shading or thickness of the line segment of the projection vector or the arrow, or the size or opening angle of the arrow. 2. The flow velocity vector display method according to claim 1. (3) The flow velocity vector display method according to claim 1, wherein the magnitude of velocity in a velocity component in a direction perpendicular to the projection plane is displayed as a vector having a different color tone or line type from the projection vector.