| Parachute deployment, inflation and terminal steady descent are fluid medium and parachute coupled, nonlinear and time-dependent processes. During the past several decades, in the development of parachute systems time spent in wind tunnel and flight experiment is 80% of the total volume of the work, and that of theoretical and design parametric study is 20% only. At present, the missions of parachute design have increased tremendously, requirements have become more stringent and the experiments become more costly. With the development of computer technology and numerical simulation technology, computational methods have the greatest potential of providing the necessary reference for parachute design.This thesis is to use loosely coupled methods to simulate the process of parachute deployment, by means of using MpCCI fluid-structure interaction analysis software. To consider the impact of the umbrella top-hole, deployment processes of two different types of flat-circular parachute (one type without an umbrella top-hole and the other with an umbrella top-hole) are calculated respectively, the computational results are analyzed and compared in detail, finding that the flat-circular parachute with an umbrella top-hole is more superior in all aspects than the flat-circular parachute without an umbrella top-hole under the same conditions of canopy resistance. Finally the role of the umbrella top-hole in the process of canopy deployment is explained. Models with varying parameters such as different velocities, different rope lengths and numbers of ropes have been investigated for discovering the further effects of the canopy load.
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