Lagrangian quasi-order structure analysis method for 3D ocean currents

A technology for structural analysis and ocean currents, applied in instrumentation, computing, image data processing, etc., to solve problems such as limitations

Active Publication Date: 2019-05-14
OCEAN UNIV OF CHINA
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Problems solved by technology

At the earliest, due to the limitation of technical means, only a small amount of data in the discrete time of fixed observation points can be obtained, so the analysis is limited to time longitudinal analysis and comparison

Method used

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  • Lagrangian quasi-order structure analysis method for 3D ocean currents

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Embodiment Construction

[0010] 1. Initialize the grid and generate the Cauchy Green strain tensor for each grid point, and find the eigenvector corresponding to the largest eigenvalue of the tensor matrix.

[0011] Initialize three-dimensional grid points with equal intervals in the research space. In order to improve the calculation accuracy, six auxiliary points are initialized in the six directions of up and down, left and right, and front and back of each grid point. Note that the distance from the auxiliary point to the main grid point should be much smaller than the distance between the main grid points. Use cubic spline interpolation to obtain the speed of each node in the grid at different times, let the auxiliary points move in the flow field for a period of time, and perform space-time interpolation on the surrounding flow field to obtain the movement of the auxiliary points, and then obtain the main network Deformation gradient matrix around the grid. The gradient matrix is ​​multiplied b...

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Abstract

The invention relates to a three-dimensional ocean current Lagrange coherent structure analysis algorithm and provides a flow field omnibearing analysis method. Different from planar flow field structure analysis in the prior art, the three-dimensional ocean current Lagrange coherent structure analysis algorithm can more comprehensively and objectively present the flow field structure. For most ocean flows in the sea, principal axes with fastest speeds are below the sea level, sea surface results are taken as main flow field characteristics in the prior art, and the results are not accurate. The three-dimensional ocean current Lagrange coherent structure analysis algorithm utilizes a three-dimensional curved surface to express the flow field structure, and more comprehensive and accurate results can be realized.

Description

technical field [0001] The invention belongs to the field of flow field structure analysis, and specifically relates to a three-dimensional ocean current Lagrangian quasi-order structure analysis method. Background technique [0002] The study of fluid structure has a long history. At the earliest, due to the limitation of technical means, only a small amount of data in discrete time at fixed observation points can be obtained, so the analysis is limited to time longitudinal analysis and comparison. In recent years, the development of high-resolution satellite remote sensing data has made it possible to analyze large-scale ocean currents within a certain period of time. Earlier, Finite-Time Lyapunov Exponent (finite-time Lyapunov exponent) FTLE was widely discussed as a simple and direct identification method. It can describe the degree of stretching of fluid particles within a certain period of time, reflect the aggregation or dispersion of various parts in the flow field...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/00
CPCG06T17/00G06T2210/24
Inventor 田丰林陈戈何遒
Owner OCEAN UNIV OF CHINA
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