Multi-block structure grid data compression and storage method and device and multi-block structure grid data decompression method and device

Abstract

The invention discloses a multi-block structure grid data compression and storage method. The method comprises the following steps: extracting block information and grid geometric data of a pluralityof block structure grids; outputting the number nblocknum of the grid blocks to a file; extracting logic surface information and logic surface geometric data of six logic surfaces of a single grid block; sequentially outputting the logic surface information and the logic surface geometric data of the six logic surfaces of the single grid block to a compressed file, and completing output of the logic surface information and the logic surface geometric data of the single grid block; and completing output of logic surface information and logic surface geometric data of all grid blocks of the plurality of structural grids, and generating a compressed storage file of the plurality of structural grids. According to the method, the logic surface information and the logic surface geometric data ofthe single-block structure grid are extracted, the geometric data of the original grid are encoded and compressed, and then the logic surface information and the logic surface geometric data of the grid are stored, so that the storage space of the grid data is reduced, all grid geometric data can be recovered in a lossless manner, the storage space is small, and the storage efficiency is high.

Description

technical field [0001] The present invention relates to the grid field of numerical simulation, in particular to the field of multi-block structured grid storage in CFD (Computational Fluid Dynamics), specifically a multi-block structured grid data compression storage method, decompression method and device . Background technique [0002] With the rapid development of computer technology and parallel computing methods, the simulation capability of CFD (Computational Fluid Dynamics) has been rapidly improved, and it has become an important tool in the design and performance evaluation of aerospace vehicles. Simulation provides high-precision flow field calculation data for aircraft design, supports the optimization and improvement of aircraft design schemes, and expands the performance boundaries of aircraft. [0003] CFD discretizes the flow field space by calculating the grid, and then solves the algebraic discrete equations to obtain flow variables, such as density, press...

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Problems solved by technology

[0007] The present invention aims at the storage and transmission crisis caused by the current use of all geometric data storage formats, as well as the resulting increase in storage costs. The present invention proposes a multi- Block structure grid data compression storage and decompression method, by extracting the logical surface information and logical surface geometric data of a single block structure grid, encoding and compressing the geometric data of the original grid, and then storing the grid logical surface information and logical surface Geometric data, reducing the storage space of grid data, when the grid is to be used, use the corresponding decompression method to recover all grid geometric data without loss, with small storage space and high storage efficiency

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