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Fluid Structure Interaction

Modelling of the Overcasting Reinforcement Process using the LS-DYNA ICFD Solver

The overcasting reinforcement process is a complex casting technique for creating lightweight aluminum components with additional strength from an aluminum matrix composite (AMC) insert. Empirical work to date has shown there are opportunities to further enhance the quality of adhesion between this AMC insert and cast aluminum. It is also evident that developing a predictive tool of bond quality will reduce the need for invasive measuring techniques.

Recent and Future Developments for the ICFD Solver in LS-DYNA

Since its release in R7 the Incompressible CFD solver (ICFD) has been rapidly improving and increasing its functionality. In this paper a summary of the latest and current developments will be presented. The focus will be on four topics. First the steady state solver and its coupling capabilities for fluid-structure interaction (FSI) or conjugate heat transfer (CHT) will be presented. In second place the recent modifications to the boundary layer mesh generation will be introduced where some default parameters have changed. The possible implications of these changes in the solution will be mentioned. Third a short introduction to coupling ICFD with LS-OPT for shape optimization will be presented. The idea is to use ANSA to morph the surface mesh driven by LS-OPT to provide an optimal solution. Finally some of the current developments will be enumerated like immersed interfaces, periodic boundary conditions, porous media through shell elements for parachute simulation, etc. These developments will be part of future LS-Dyna releases.

Parachute Deployment Simulations using LS-DYNA ICFD Solver and Strong FSI Coupling

The main goal of military airdrops is the accurate delivery of cargo released from a moving air vehicle via parachute. The airdrop trajectory results from the movement of the dropped package and the dynamics of the parachutes deployment (Fig.1:). After having treated the freefall of a rigid object in the near flow of an airplane ([8]), the present paper focuses on the parachute deployment modelling and its challenges in LS-DYNA.