Study of Ditching Characteristics of Transport Aircraft by Global Moving Mesh Method

This paper numerically investigates the ditching characteristics of the NACA TN 2929 model. In the simulation method, the Reynolds-averaged Navier–Stokes equation and realizable k-e turbulence model are solved by the finite volume method; the volume-of-fluid method is used to capture the water–air interface; the six-degree-of-freedom model and the global-moving-mesh method are used to deal with the relative motion between the water and the object. Global moving mesh is a new dynamic-mesh method, which is proposed to simulate water-entry problems. In global moving mesh, the whole computational domain and boundaries move together with the object to avoid the high computational expense and low-quality mesh in the traditional mesh-deformation method. This numerical method is applied to simulate the water impact of a two-dimensional cylinder in free fall, and the results show a good agreement with the experimental data. The effect of each aerodynamic part of the NACA TN 2929 model on the ditching behavior is s...