A simulation method for the falling process of airdropped objects

Abstract

The invention relates to a method for simulating the falling process of an airdropped object. The static grid technology is used to simulate the falling process of the airdropped object by considering the relative relationship between the flow field and the object. The steps include: 1) determining the initial state and Initial flow field boundary condition; 2) Determine the motion state of the object at the next moment according to the force of the airdropped object; 3) Determine the flow field boundary condition at the new moment according to the relative motion state of the airdropped object and the incoming flow; 4) Update the flow field Boundary conditions; 5) Determine whether the airdropped object has landed, if the airdropped object has landed, then terminate the simulation, if not, repeat steps 2)‑4). Compared with the prior art, the invention has the advantages of small calculation amount, short simulation time, accurate results and the like.

Description

technical field [0001] The invention relates to the field of computer simulation, in particular to a method for simulating the falling process of an airdropped object. Background technique [0002] Airdropped objects, such as bombs, need to be evaluated in accordance with the national military standard GJB 349.22-1989 by actually dropping bombs to measure the "standard fall time" of the airdropped objects during the research and development process. The test method is under standard atmospheric conditions (the ground pressure is 760mm mercury The height of the column, the ground temperature is 15°C, and the ground air density is 1.225kg / m 3 , the air temperature increment rate is 0.0065°C / m) the falling time of a bomb dropped from a plane flying horizontally at a height of 2000m and a speed of 40m / s. However, the execution period of the above process is long and the cost is high. Since the shape of the bomb needs to be continuously optimized in the design stage to improve i...

AI Technical Summary

Problems solved by technology

For example, for the simulation of the falling process of an airdropped object, it is necessary to create a flow field with a height of 2000m and a length of hundreds of meters, while the relative size of the airdropped object is much smaller, and a large number of grids are required to ensure the simulation accuracy, calculation amount and simulation time. Difficult to predict, it is difficult for ordinary computers to satisfy

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