The Application of Overset Grid in the Analysis of Impact Loads of Amphibious Aircraft during Landing on the Water

In view of the complex three-phase coupling problem of gas, liquid and solid when amphibious aircraft landed on the water surface, based on the finite volume method, the overset grid technology was used to simulate the landing load characteristics of amphibious aircraft; firstly, the overset grid technology was used to establish the landing model of amphibious aircraft, and the load characteristics under different landing conditions were obtained, and compared with the model test results. The results show that, firstly, the larger the sinking speed is, the larger the load is, and the more obvious bounce phenomenon occurs; secondly, the transverse distribution of the bottom pressure gradually increases along the keel to bilge; thirdly, the load characteristics obtained by numerical simulation are basically consistent with the model test. Therefore, the overset grid technology can simulate the landing load characteristics of amphibious aircraft and provide an effective method for the landing load design of amphibious aircraft.