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Topological driven plane flow field streamline placement method

A planar flow field and streamline technology, applied in the field of streamline-based planar flow field visualization, can solve the problems of not clearly considering the flow field topology skeleton limit streamline, etc., to achieve improved visualization effect, high execution efficiency, and improved visual effect Effect

Inactive Publication Date: 2010-04-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The method of Verma et al. utilizes the critical points in the topological skeleton of the flow field, but does not explicitly consider the limit streamlines in the topological skeleton of the flow field

Method used

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  • Topological driven plane flow field streamline placement method
  • Topological driven plane flow field streamline placement method
  • Topological driven plane flow field streamline placement method

Examples

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Embodiment Construction

[0046] For the definition in the region D=[x min , x max ]×[y min ,y max ] in the planar flow field F: , in practical applications, it is usually discretized into a rectangular grid cell C covering the domain i，j (i=1,...M, j=1,...,N), at the center of each grid cell (x i，j ,y i，j ), there is a vector (u i，j , v i，j ). This discretized and digitized plane flow field is the object to be dealt with in the specific implementation process of the present invention. As an example, figure 1 The discretized, digitized planar flow field is shown by vector arrows. The domain of definition of the flow field is: [-2, 2] × [2, 2], the interval between adjacent sampling points in the horizontal direction and vertical direction is 0.1, any sampling point (x, y) Velocity (u, v) is defined as:

[0047] u = real ( f ) ...

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Abstract

The invention discloses a topological driven plane flow field streamline placement method, which comprises steps of constructing a rectangular control grid covering a set plane flow field, forming a topological framework of the total flow field by critical points which refer to points with zero flow rate in the flow field and a limiting streamline, utilizing the limiting streamline as an initial streamline to be placed on the original plane flow field, overlapping the rectangular control grid on the original flow field, separating the control grid to be a continuous area with zero or non-zero attribute value, separating the original blank continuous area into smaller blank continuous areas after placing the acquired streamline which is used as a new streamline onto the original plane flow field, and finally completing placement of streamline of the total original plane flow field when sizes of all the blank continuous area in the control grid are smaller than a designed value by repeating the above steps, wherein the continuous area with zero attribute value is called a blank continuous area, selecting a blank continuous area from the control grid to acquire a center point and a streamline passing through the point. The topological driven plane flow field streamline placement method is low in calculation amount, accurate in precision and strong in operability.

Description

technical field [0001] The invention relates to a topology-driven method for placing streamlines in a plane flow field, which belongs to the technical field of scientific computing visualization, and in particular to visualization of a plane flow field based on streamlines. Background technique [0002] In the fields of fluid mechanics, aerodynamics, meteorology, etc., in order to grasp the laws and effects of fluid motion such as airflow and water flow, it is necessary to measure or numerically simulate the fluid motion in the flow field, and the result is described Flow field data for fluid motion. Flow field data usually describe the magnitude and direction of flow velocity at spatial locations in the form of discrete grids. Therefore, the flow field data is actually vector data, so the flow field is also called a vector field. [0003] In order to understand the motion of the fluid from the measured or simulated numerical results, the flow field data must be further an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G01M10/00G01M9/00G01W1/00
Inventor 张文耀宁建国
Owner BEIJING INSTITUTE OF TECHNOLOGYGY