A performance evaluation method and system for an aircraft

Abstract

The invention discloses a method and a system for evaluating the performance of an aircraft. The evaluation method comprises the steps of establishing an overlapped grid model of a target aircraft; Creating a management node, S nested working nodes and N computing working nodes; Extracting N nested grids and S nested grids from the overlapped grid model through the management node; Respectively performing nesting processing on the S nesting grids through the S nesting working nodes; Respectively carrying out aerodynamic force calculation on the N nested grids through N calculation working nodes, and carrying out initial aerodynamic force calculation result exchange and a nested difference value according to nested exchange index information to obtain a local grid aerodynamic force calculation result; Summarizing the local grid aerodynamic force calculation results through the management nodes, judging whether calculation ending conditions are met or not, and outputting the aircraft aerodynamic force calculation results if the calculation ending conditions are met. According to the invention, the aerodynamic analysis speed of the aircraft is improved, and the performance evaluationspeed of the aircraft is further improved.

Description

technical field [0001] The invention relates to the field of aircraft, in particular to an aircraft performance evaluation method and system. Background technique [0002] Nested grid technology can allow overlapping or coverage of grid blocks in CFD solution, which can eliminate the need for complicated topological partitions in the generation of structural grids, reduce the difficulty of grid generation, and make up for its shortcomings of poor adaptability to shape; Nesting solves the problem that the grid deformation cannot span a grid scale in the dynamic grid technology, and the grid needs to be regenerated when the grid is reconfigured, and it is difficult to guarantee the conservation criterion. For large-scale motion, especially rotary motion such as rotor blades, the use of motion nesting has become almost an irreplaceable method. [0003] Although the existing nested grid method is available to a certain extent, its operation speed is relatively slow. For example...

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Problems solved by technology

[0003] Although the existing nested grid method has certain usability, it runs slowly. For example, it takes 21.4s to nest a nested grid model containing 4.83 million grid cells.

Moreover, in motion simulation, the nesting process needs to be redone at each time step, and the total nesting time consumption cannot be ignored. The time-consuming nesting has become a key factor restricting the rapid aerodynamic analysis of aircraft.

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