TAFSM

Team for Advanced Flow Simulation and Modeling



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  tezduyar@gmail.com

Simulation and Modeling of Large, Ram-Air Parachutes


Deployment of large, ram-air parachutes for heavy payloads and with good maneuvering capability is of major interest to the US Army and NASA. The size requirements of these parachutes make the drop test costly and the laboratory tests essentially impossible. The T*AFSM, in collaboration with US Army Natick Soldier Center, is developing advanced methods to simulate the deployment, gliding, maneuvering and landing stages of these parachutes. The methods take into account the fluid-structure coupling between the aerodynamics of the parachute, which depends on the instantaneous shape of the parachute, and the deformation of the parachute, which in turn depends on the aerodynamical forces acting on the parachute. The simulations are carried out on state-of-the-art HPC platforms, such as a CRAY T3E-1200. The figures above show a picture from an actual drop test, the air pressure distribution on the parachute canopy, and the stresses generated on the parachute fabric.

References:

1. T.E. Tezduyar, "Stabilized Finite Element Formulations for Incompressible Flow Computations", Advances in Applied Mechanics, 28 (1991) 1-44.

2. T.E. Tezduyar, M. Behr and J. Liou, "A New Strategy for Finite Element Computations Involving Moving Boundaries and Interfaces--The DSD/ST Procedure: I. The Concept and the Preliminary Numerical Tests", Computer Methods in Applied Mechanics and Engineering, 94 (1992) 339-351.

3. T.E. Tezduyar, M. Behr, S. Mittal and J. Liou, "A New Strategy for Finite Element Computations Involving Moving Boundaries and Interfaces--The DSD/ST Procedure: II. Computation of Free-surface Flows, Two-liquid Flows, and Flows with Drifting Cylinders", Computer Methods in Applied Mechanics and Engineering, 94 (1992) 353-371.

4. S. Mittal and T.E. Tezduyar, "Massively Parallel Finite Element Computation of Incompressible Flows Involving Fluid-Body Interactions", Computer Methods in Applied Mechanics and Engineering, 112 (1994) 253-282.

5. S. Mittal and T.E. Tezduyar, "Parallel Finite Element Simulation of 3D Incompressible Flows--Fluid-Structure Interactions", International Journal for Numerical Methods in Fluids, 21 (1995) 933-953.

6. T. Tezduyar, V. Kalro and W. Garrard, "Parallel Computational Methods for 3D Simulation of a Parafoil with Prescribed Shape Changes", Parallel Computing, 23 (1997) 1349-1363.

7. S. Mittal and T. Tezduyar, "Finite Element Simulation of Large Ram-Air Parachutes", Seminar Proceedings of National Symposium on Parachute and Lighter-than-Air Systems Technologies, Para India (1997).

8. T. Tezduyar, "Advanced Flow Simulation and Modeling", Flow Simulation with the Finite Element Method (in Japanese), Springer-Verlag, Tokyo, Japan (1998).

9. R. Benney, K. Stein, V. Kalro, T. Tezduyar, J. Leonard and M. Accorsi, "Parachute Performance Simulations: A 3D Fluid-Structure Interaction Model", Science and Technology for Army After Next -- Proceedings of 21st Army Science Conference, Norfolk, Virginia (1998).

10. T. Tezduyar, "CFD Methods for Three-Dimensional Computation of Complex Flow Problems", Journal of Wind Engineering and Industrial Aerodynamics, 81 (1999) 97-116.

11. V. Kalro and T. Tezduyar, "A Parallel 3D Computational Method for Fluid-Structure Interactions in Parachute Systems", Computer Methods in Applied Mechanics and Engineering, 190 (2000) 321-332.