SIMULATION OF HYDRODYNAMIC RAM OF AIRCRAFT FUEL TANK BY BALLISTIC PENETRATION AND DETONATION

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1525-1530 ◽  
Author(s):  
JONG H. KIM ◽  
SEUNG M. JUN
Keyword(s):  
Fluid Structure Interaction ◽  
Fuel Tank ◽  
Explicit Calculation ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Intermediate Complexity ◽  
Hydrodynamic Ram ◽  
Aircraft Fuel ◽  
Ram Effect ◽  
Ballistic Penetration

Airframe survivability and hydrodynamic ram effect of aircraft are investigated. Penetration and internal detonation of a simple tank and ICW(Intermediate Complexity Wing) are simulated by nonlinear explicit calculation. Structural rupture and fluid burst are analytically realized using general coupling of FSI(Fluid-Structure Interaction) and adaptive master-slave contact. Besides, multi-material Eulerian solver and porosity algorithm are employed to model explosive inside fuel and tank bays which are defined in multi-coupling surfaces. Structure and fluid results are animated on the same viewport for enhanced visualization.

The Simulation of Dual Layer Fuel Tank During the Impact With the Ground Based on Parallel Computing

2007 ◽  
Vol 2 (4) ◽  
pp. 366-373 ◽  
Author(s):  
Li Zheng ◽  
Jin Xiang-long ◽  
Chen Xiang-dong
Keyword(s):  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Fuel Tank ◽  
Woven Fabric ◽  
Structural Domain ◽  
Arbitrary Lagrangian Eulerian ◽  
Fluid Structure ◽  
Bisection Algorithm ◽  
Structure Interaction ◽  
The Impact

The crashworthiness of a dual layer fuel tank, with the outer layer made of metal and the inner layer made of woven fabric composite material, is fundamental for the survivability of an impact with the ground in emergency. In this research, the simulation of a three-dimensional dual layer fuel tank in the impact with the ground is achieved through the multimaterial arbitrary Lagrangian-Eulerian (ALE) finite element method because of its ability to control mesh geometry independently of geometry. At the same time, the naked flexible tank in the impact with the ground is simulated for the evaluation of the outer metal tank. The ALE description is adopted for the fluid domain, while for the structural domain the Lagrangian formulation is considered. The computation of the fluid-structure interaction and the impact contact between the tank and the ground are realized by the penalty-based coupling method. Then, the dynamic behaviors of the dual layer fuel tank and the naked flexible tank in the impact are analyzed. In the meantime, the parallelism of the dual layer fuel tank is discussed because the computation of the fluid-structure interaction and the impact contact is quite time consuming. Based on domain decomposition, the recursive coordinate bisection (RCB) is improved according to the time-consuming characteristics of fluid-filled tank in the impact. The result indicates, comparing with the RCB algorithm, that the improved recursive coordinate bisection algorithm has improved the speedup and parallel efficiency.

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