Blunt body flow field shock wave self-adaptive structure grid generation method

Abstract

The invention discloses a blunt body flow field shock wave self-adaptive structure grid generation method. A blunt body flow field is a flow field in which a blunt body moves at a high speed in air and can generate complete separation shock waves in front of the blunt body, and the blunt body flow field self-adaptive structure grid generation method is achieved through the following steps: calculating initial three-dimensional full flow field data according to front incoming flow conditions in combination with initial flow field grids; capturing shock wave grid points according to the Mach number distribution of the flow field, assembling the shock wave grid points into a shock wave grid surface, and carrying out fairing processing on the shock wave grid surface; reconstructing a flow field grid by taking the shock wave grid surface as an internal butt joint boundary, so as to enable grids near the shock wave to distributed along the shock wave surface and encrypting the grids in a direction perpendicular to the shock wave, and recalculating three-dimensional full-flow-field data by adopting the reconstructed flow field grid; carrying out iterative flow field calculation, shock wave capture and grid reconstruction automatically until the error between the two shock wave grid surfaces is smaller than a preset threshold value, and completing shock wave adaptive generation of thestructural grid, wherein the flow field grid is a multi-region butt joint structured hexahedral grid.

Description

technical field [0001] The invention relates to a calculation fluid dynamics grid generation method, in particular to a blunt body flow field shock wave self-adaptive structural grid generation method, which belongs to the technical field of flow field numerical simulation and grid generation. Background technique [0002] The blunt body is a typical shape of an aircraft. When the blunt body aircraft reaches a certain flight speed in the air, the airflow is strongly compressed in front of the blunt body and generates a strong shock wave. The kinetic energy is dissipated in the boundary layer due to the gas viscosity and converted into internal energy, and part of the energy is transferred to the blunt body through aerodynamic heating. The temperature of the heat-resistant material gradually increases, resulting in a decrease in the strength and stiffness of the heat-resistant material. It may even be burned, which will affect the safe flight of the aircraft. Therefore, it is...

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Problems solved by technology

[0003] Most of the current flow field adaptive technologies are based on unstructured grids. However, the accuracy of aerothermal calculations using unstructured grids is low. In engineering applications, aerothermal calculations mainly rely on structured grids, and there is currently no standard structure. Grid Shock Wave Adaptive Generation Method to Solve Such Problems

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