Transactions of Nanjing University of Aeronautics & Astronautics
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Numerical simulation of ATPS parachute transient dynamics by using fluid-structure interaction method
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Abstract:
In order to simulate and analysis the dynamic characteristics of the parachute from Advanced Tactical Parachute System (ATPS), the nonlinear finite element algorithm and preconditioning finite volume method are employed and coded to construct three dimensional parachute fluid-structure interaction (FSI) model. Parachute fabric material are represented by membrane-cable elements, geometrical nonlinear algorithm is employed with wrinkling technique embedded to simulate large deformations of parachute structure by applying Newton-Raphson iteration method. On the other hand, the time-dependent flow surrounding parachute canopy is simulated by using preconditioned Lower-Upper Symmetric Gauss-Seidel (LU-SGS) method. The pseudo solid dynamic mesh algorithm is coded to update the flow field mesh based on the complex and arbitrary motion of parachute canopy. Due to the large amount of computation during FSI simulation, MPI parallel computation technique has been developed for all those three modules to improve the performance of this FSI code. The FSI code has been tested to simulate one kind of ATPS parachutes to predict the parachute configuration and anticipate the parachute descent speeds. The comparison of results between this code and former literature demonstrated this code to be a useful tool for parachute designers.
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