Accelerated analysis method for aerodynamic characteristics of free molecular flow of aircraft

By introducing uniform grid spatial partitioning and OpenMP parallel processing into the aerodynamic characteristic analysis of low Earth orbit vehicles, and optimizing the ray tracing surface element method, the problem of balancing computational efficiency and accuracy is solved, and efficient and high-precision aerodynamic characteristic prediction is achieved.

CN121835510APending Publication Date: 2026-04-10CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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Patent Information

Application Number
CN202610081023.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-21
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing technologies struggle to balance computational efficiency and accuracy in the aerodynamic characteristics analysis of low Earth orbit vehicles. High-efficiency methods lack sufficient accuracy, while high-accuracy methods are inefficient.

Method used

We adopt a method that combines uniform grid spatial partitioning and OpenMP parallel processing. By constructing a spatial indexed grid and multi-threaded parallel processing, we optimize the shadow analysis process of the ray tracing surface element method, reduce computational complexity and improve computational efficiency.

Benefits of technology

It achieves efficient and high-precision prediction of the aerodynamic characteristics of free molecular flow in ultra-low orbit vehicles, improving computational efficiency by 1-2 orders of magnitude while maintaining computational accuracy and significantly increasing computational speed.

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Abstract

The invention discloses an accelerated analysis method for aerodynamic characteristics of a free molecular flow of an aircraft, belongs to the field of numerical simulation of rarefied gas dynamics, and aims to solve the problem of low shadow analysis calculation efficiency of a ray tracing surface element method in aerodynamic analysis of an extremely low earth orbit aircraft. The method comprises the following steps of: initializing parameters and reading a surface grid; establishing a uniform background grid as a spatial index, and quickly associating surface triangular surface elements to corresponding sub-grids; an OpenMP parallel instruction is adopted, and ray tracing-based shielding judgment is executed on a large number of surface elements at the same time; and calculating the aerodynamic contribution of the unshielded surface element according to the free molecular flow theory, and integrating to obtain the overall aerodynamic force. According to the method, the calculation complexity of shadow analysis is remarkably reduced from O (N) through cooperation of spatial index and parallel calculation, and efficient and high-precision prediction of the aerodynamic characteristics of the extremely-low-orbit aircraft is achieved on the premise that precision is guaranteed.
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