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Method for quickly calculating mean vorticity deviation of ocean mesoscale vortexes Lagrange

A fast calculation and vorticity technology, applied in the field of big data analysis, can solve problems such as high requirements for computing power, reducing the progress of analyzing ocean material transportation, and affecting the efficiency of users to obtain the final vortex structure.

Pending Publication Date: 2020-02-11
OCEAN UNIV OF CHINA
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Problems solved by technology

[0004] The current calculation of LAVD, especially the Runge-Kutta integral, takes too long when processing large data. High spatial resolution data requires high computer memory, and high temporal resolution data requires high computer computing power. Directly affect the efficiency of users to obtain the final vortex structure, and greatly reduce the progress of analyzing ocean material transport
Especially for global long-term data, the time complexity of calculation will increase exponentially, which greatly delays the scientific research process

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  • Method for quickly calculating mean vorticity deviation of ocean mesoscale vortexes Lagrange
  • Method for quickly calculating mean vorticity deviation of ocean mesoscale vortexes Lagrange

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Embodiment Construction

[0019] 3. Accelerated Runge-Kutta integral and vorticity calculation

[0020] According to the two-dimensional current field data on the sea surface, the velocity field grid data required for calculation is obtained. First, the velocity field, the particle grid to be calculated, and the integral parameters are passed to the GPU, and each particle point is assigned to each thread of the GPU. The global parameters are used as global variables for all threads to share, and information such as particle point coordinates is provided as local variables. Local memory for each thread. Secondly, the time step is used as the iteration step to perform Runge-Kutta integration, and the coordinate values ​​obtained by the integration are substituted into the vorticity calculation formula to obtain the vorticity information of the particle point at the current time. After each integration is completed, update the time information in the CPU and judge whether it exceeds the limit. If it exce...

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Abstract

The method is used for calculating ocean mesoscale vortex Lagrange average vorticity deviation based on sea surface two-dimensional flow field data. The acceleration method for the calculation processis studied, the GPU is used for accelerating the particle integration process and carrying out trapezoidal integration along the time axis in the acceleration process, and the method is novel in content and clear in target and has reference significance for global high-spatial-resolution long-time-span vector field calculation. Meanwhile, the problems that time consumed for solving an ordinary differential equation and extracting isolines is too long, and the memory occupancy rate is too large are solved, and good robustness and objectivity are achieved.

Description

technical field [0001] The invention conducts big data analysis based on ocean surface velocity field data combined with Langerangian average eddy deviation correlation research, and belongs to the interdisciplinary field of remote sensing big data processing and physical ocean. Background technique [0002] In turbulent flow, Lagrangian-averaged vorticitydeviation (LAVD for short) is the basis for calculating rotationally coherent Lagrangian vortices (RCLVs for short), which is an effective representation For the quasi-order structure of vortex material transport, in the elliptic Lagrangian calculation method, the calculation steps of LAVD are relatively simple, but due to the high correlation with time, it can still effectively guarantee its reliability in the field of material transport research. Using The exploration of the LAVD method is of great significance to the changes in the structure of the oceanic current system and the atmospheric convection brought about by th...

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Application Information

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IPC IPC(8): G06F17/16G06F9/50
CPCG06F17/16G06F9/5027
Inventor 田丰林刘潇何遒陈戈
Owner OCEAN UNIV OF CHINA
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