Analysis of flow field and safety of skydiving from the aircraftOA

To simulate the initial phase of a skydiver exiting an aircraft with rear-mounted turbofan engines,the unsteady fluid-structure interaction(FSI)method and turbulence model are used in conjunction with moving mesh technology.The simulation results show that while opening both the front and aft cabin doors enlarges the low-velocity wake zone,the front cabin door causes this zone to shift toward the side where it is located.The skydiver''s exit can be divided into two phases based on their position relative to the low-velocity wake zone of the front cabin door.At three specified aircraft velocities,the skydiver''s trajectories in both phases are considered safe and stable.In the second phase,the distance between the skydiver and the aircraft increases rapidly compared to the first.As aircraft velocity increases,both the streamwise and spanwise accelerations of the jumper''s center of mass rise,while the normal acceleration decreases.The skydiver''s attitude angle remains constant during the first phase but increases during the second phase,with higher flight velocities resulting in greater angular acceleration.