Efficient nested grid host unit searching method in aircraft dynamic flow field analysis

Abstract

The invention provides an efficient nested grid host unit searching method in dynamic flow field analysis of an aircraft, which comprises the following steps of: creating more than one sub-ADT tree of a series for grid units in a given area, and registering storage addresses of the sub-ADT trees to a register book in an array form; firstly, grid points to be checked are freeze-framed on sub-ADT corresponding to a specific local area according to coordinate positions of the grid points to be checked, then corresponding host units of the grid points to be checked are searched in a conventional ADT mode, and therefore multiple sets of mutually-nested grids are assembled, and aircraft dynamic motion flow field analysis is carried out. According to the method, the depth of each sub ADT is greatly reduced, so that each sub ADT tree structure has better balance, meanwhile, the to-be-searched point is quickly positioned to a very small local area, the area range searched by the host unit is reduced, the search time is effectively reduced, and the numerical simulation time of the dynamic motion process of the aircraft is shortened.

Description

technical field [0001] The invention relates to the technical field of fluid mechanics, in particular to an efficient nested grid host unit search method in the dynamic flow field analysis of an aircraft. Background technique [0002] With the rapid development of computer technology in recent years, Computational Fluid Dynamics (CFD) has developed vigorously. CFD technology has become a basic key technology for hydrodynamic and aerodynamic analysis, and has been widely verified in the fields of aerospace, marine vehicles, etc. with application. However, many practical engineering problems will involve the analysis of geometric deformation or multi-body relative motion of aircraft dynamic motion flow field, such as flaperon deflection, landing gear retraction, weapon separation, etc. Dynamic grid technology is calculated by CFD unsteady flow field an important job. With the movement of the boundary, the computational mesh of the flow field at each time step needs to be upd...

AI Technical Summary

Problems solved by technology

But when dealing with large-scale grids, the tree structure of ADT will be extremely unbalanced, and the depth of the tree will increase sharply, seriously reducing the efficiency of searching for host units

Images