Fluid-structure interactions play an important role in many different types of real-world situations and industrial applications involving large structural deformation and material or geometric nonlinearities. Numerical problems due to element distortions limit the applicability of a Lagrangian description of motion when modeling large deformation processes. An alternative technique is the multi-material Eulerian formulation for which the material flows through a mesh, fixed in space and each element is allowed to contain a mixture of different materials. The method completely avoids element distortions and it can, through an Eulerian-Lagrangian coupling algorithm, be combined with a Lagrangian description of motion for parts of the model. The Eulerian formulation is not free from numerical problems. There are dissipation and dispersion problems associated with the flux of mass between elements. In addition, many elements might be needed for the Eulerian mesh to enclose the whole space where the material will be located during the simulated event. This is where the multi-material arbitrary Lagrangian-Eulerian (ALE) formulation has its advantages. By translating, rotating and deforming the multi-material mesh in a controlled way, the mass flux between elements can be minimized and the mesh size can be kept smaller than in an Eulerian model. A new Fluid Structure coupling algorithms based on the penalty method is presented in this paper. The coupling algorithm and improved multi-material ALE-capabilities have made LS-DYNA an efficient tool for analyzing large deformation processes, such as bird strike events, forging operations and penetration problems and airbag simulations. This paper contains five example problems that illustrate the current features of the code.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4680-6
PROCEEDINGS PAPER
ALE and Fluid/Structure Interaction in LS-DYNA
M. Souli,
M. Souli
Universite´ des Sciences et Technologies de Lille, Villeneuve D’Ascq, France
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Y. Sofiane,
Y. Sofiane
Universite´ des Sciences et Technologies de Lille, Villeneuve D’Ascq, France
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Lars Olovsson
Lars Olovsson
Livermore Software Technology Corporation, Livermore, CA
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M. Souli
Universite´ des Sciences et Technologies de Lille, Villeneuve D’Ascq, France
Y. Sofiane
Universite´ des Sciences et Technologies de Lille, Villeneuve D’Ascq, France
Lars Olovsson
Livermore Software Technology Corporation, Livermore, CA
Paper No:
PVP2004-2870, pp. 181-187; 7 pages
Published Online:
August 12, 2008
Citation
Souli, M, Sofiane, Y, & Olovsson, L. "ALE and Fluid/Structure Interaction in LS-DYNA." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Emerging Technology in Fluids, Structures, and Fluid Structure Interactions: Volume 1, Fluid Dynamics and Fluid Structure Interactions. San Diego, California, USA. July 25–29, 2004. pp. 181-187. ASME. https://doi.org/10.1115/PVP2004-2870
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