Intelligent analysis method oriented to unsteady three-dimensional flow field vortex structure

A three-dimensional flow field, intelligent analysis technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems of excessive display complexity, information omission, etc., to achieve high matching accuracy, good product design and performance analysis, fast effect

Inactive Publication Date: 2012-01-18
ZHEJIANG UNIV
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Problems solved by technology

[0005] In order to avoid the problems of information omission or overly complicated display encountered in the process of dimension reduction by traditional visualization technology, the present invention provides an intelligent analysis method for the vortex structure of unsteady three-dimensional flow field for the post-processing part of computational fluid dynamics software

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  • Intelligent analysis method oriented to unsteady three-dimensional flow field vortex structure
  • Intelligent analysis method oriented to unsteady three-dimensional flow field vortex structure
  • Intelligent analysis method oriented to unsteady three-dimensional flow field vortex structure

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Embodiment Construction

[0023] 1. Obtain fluid calculation data;

[0024] The acquisition of computational fluid dynamics data requires several steps of geometric modeling, grid division, and solver solution. Geometric modeling needs to obtain the precise size of the geometric model through actual engineering surveying and mapping, including geometric information such as the length, width, height, and radius of the actual geometric model, and use geometric modeling software to establish the geometric model; according to the needs of actual calculation, the geometric model It is divided into many grid units; in the calculation and solution stage, the basic equations of fluid motion are solved according to the laws of mass conservation, momentum conservation and energy conservation, and the calculation results of the flow field data are obtained.

[0025] 2. Use the eddy detection algorithm to detect the position of the vortex structure in the flow field;

[0026] Decompose the grid of the input calcu...

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Abstract

The invention discloses an intelligent analysis method oriented to an unsteady three-dimensional flow field vortex structure, which comprises four parts, i.e. detection, measurement, tracking and mining. The invention provides a complete set of analysis methods for the analysis of the unsteady three-dimensional flow field vortex structure, and valuable information can be extracted from data rapidly and efficiently. Geometrical, dynamic and statistic measurement parameters of the vortex structure can be provided to facilitate researches by mechanical experts; by adopting a tracking method matched with a vortex core, the matching accuracy is high and the speed is rapid; and by mapping high-dimensional data into a two-dimensional directed acyclic graph and by adopting a frequent sub-graph mining algorithm to mine the state change graph of the vortex structure, manual analysis is not required and the workload of experts in the field of fluid mechanics can be greatly reduced. The method disclosed by the invention can be used for the aerodynamic performance analysis in product design.

Description

technical field [0001] The invention relates to the technical field of flow field data analysis, in particular to an automatic analysis method for a vortex structure of an unsteady three-dimensional flow field. Background technique [0002] The vortex motion of fluid is a common flow phenomenon in engineering and nature, which has an important impact on product design. For example, the vortices generated around the wing may both enhance its lift force and generate strong turbulence, leading to structural fatigue and failure. The vortices created around the car increase drag, create noise, and potentially impair visibility in the rain. Therefore, it is very important to analyze the formation, motion and change of vortex. [0003] At present, the academic community has a general consensus on the formation mechanism and stability of eddies under steady conditions, but the mechanism of vortex motion under unsteady conditions is still being explored. For unsteady complex flow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 解利军李明宋广华郑耀
Owner ZHEJIANG UNIV
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