Study on numerical simulation of ditching of civil aircraft fuselage based on SPH method

With the increasing frequency of civil aircraft flying across large water areas, there are more and more situations where civil aircraft flying in the air suddenly need to make forced landing on the water surface. This article uses the equivalent scaling factor of Airbus A320 λ= 1: 30.The model is the research object, and numerical simulations are conducted on the early stage of water forced landing of civil aircraft fuselage at 8 ° and 12 ° angles of attack (350ms). Research has found that compared to an angle of attack of 8 °, the maximum stress on the belly of the aircraft at a 12 ° angle of attack is greater, and the depth of the fuselage entering the water is smaller. In both cases, the maximum stress area appears at the connection between the wing and the fuselage; Before T=215ms, the descent speed at 12 ° angle of attack decreased faster. After T=215ms, the descent speed at 8 ° angle of attack decreased faster. The final result showed that the descent speed at 8 ° angle of attack decreased more than at 12 ° angle of attack.