An Adaptive Mesh Perturbation Domain Update Acceleration Method for Aircraft Aerodynamic Characteristics Prediction

Abstract

The invention discloses an adaptive grid disturbance domain update acceleration method for predicting the aerodynamic characteristics of an aircraft. First, a new data format in which the adaptive grid and the dynamic computing domain are coupled and stored is proposed, so as to realize the dynamic computing domain information on the adaptive grid. Second, establish an adaptive detector that can identify characteristic units located in the off-body strong shock region, slow convergence, etc.; thirdly, establish an off-body strong shock that can not only accelerate the convergence but also minimize the calculation increment. Wave area anisotropic refinement grid adaptive strategy; Finally, the coupling logic and algorithm of adaptive grid refinement and dynamic computational domain update are established, and an adaptive grid disturbance domain update acceleration method is proposed. This method can further improve the acceleration effect of the existing disturbance domain update methods; compared with the traditional global update method, it can provide a technical approach to simultaneously optimize the grid and computational domain for the prediction of aircraft aerodynamic characteristics.

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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