Self-adaptive grid disturbance domain updating acceleration method for aircraft aerodynamic characteristic prediction

Abstract

The invention discloses a self-adaptive grid disturbance domain updating acceleration method for aircraft aerodynamic characteristic prediction, which comprises the following steps of: firstly, providing a novel data format for coupling storage of a self-adaptive grid and a dynamic computational domain so as to realize efficient storage and traversal of dynamic computational domain information on the self-adaptive grid; secondly, establishing a self-adaptive detector capable of identifying characteristic units which are positioned in a detached strong shock wave region and are slow in convergence and the like; thirdly, establishing a self-adaptive strategy of the anisotropic encrypted grid in the decoupled strong shock wave region, which can accelerate convergence and can minimize calculation increment; and finally, establishing coupling logic of adaptive grid encryption and dynamic computational domain updating and an algorithm thereof, and proposing a self-adaptive grid disturbance domain updating acceleration method. According to the method, the acceleration effect of an existing disturbance domain updating method can be further improved; compared with a traditional global updating method, the method can provide a technical approach for optimizing the grid and the computational domain at the same time for aerodynamic characteristic prediction of the aircraft.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to an adaptive grid disturbance domain update acceleration method for aircraft aerodynamic characteristic prediction. Background technique [0002] Computational fluid dynamics numerical simulation has become one of the important means to predict the aerodynamic characteristics of aircraft. The first step in numerical simulation is to specify the computational domain and discretize it into units to be solved, that is, to generate a computational grid. Adaptive grid technology is a grid generation technology that automatically encrypts or sparsely calculates grids according to geometric information and flow characteristics. The introduction of adaptive grid technology in the simulation of aircraft aerodynamic characteristics can significantly reduce the number of calculation grid cells while ensuring numerical accuracy in large flow gradient regions. The existing adaptiv...

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Problems solved by technology

[0004] Aiming at the problems that existing numerical simulation methods based on adaptive grid technology have invalid calculations, and existing disturbance area update methods cannot automatically optimize grid-limited acceleration effects, the present invention proposes an adaptive grid disturbance domain for aircraft aerodynamic characteristics prediction Update Acceleration Method

Solve the problem of invalid calculation in existing numerical simulation methods based on adaptive grid technology by using the disturbance domain update method, and solve the limitation of acceleration effect due to the inability to automatically optimize the grid in the existing disturbance domain update method by using adaptive grid technology problems, and put forward the new algorithm and new data format involved in the coupling of the two methods

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