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The paper focuses on a specific subset of Fluid-Structure Interaction (FSI) phenomena which often occur during fast transient dynamic events such as explosions, impacts and crashes. Accurate numerical modelling of these events requires the set up of an appropriate coupling strategy between the fluid and the structural domain, compatible with the general computational framework which for these classes of problems is typically explicit.

The application of the resulting methods to a broad spectrum of industrial problems, e.g. safety studies of power generation plants, electric equipment,, chemical or offshore facilities etc., demands general and robust algorithms and full 3D generality to deal with arbitrarily complex geometrical configurations. combined with minimum user effort.

After a tentative classification of fast FSI phenomena and the identification of those problem classes where interaction is likely to play a major role, the paper shortly reviews the fundamental coupling conditions and an algorithm for their numerical solution, based on Lagrange multipliers. The main practical difficulty, especially in geometrically complex 3D configurations (Junctions, branchings, submerged edges, etc.), lies in the determination of the normal direction to the discrete FS interface.

Three algorithms dealing with this issue are briefly presented: one (FSA) based on purely geometrical considerations, a second one (UP) which may be directly derived from equilibrium, and a third hybrid method (FSCR) which shares the strengths of the previous two and merges their application spectra. Interested readers may find further details in the references [1-4].

The proposed algorithms have been implemented in a large computer code for fast transient dynamic analysis [5], both in a classical Finite Element and in a more recent Finite Volume computational framework. The code is being used for the numerical simulation of large industrial applications, of which some illustrative ex tive ex

Additional information

Bibliographic Reference: Paper presented: V Congresso Nazionale della Societa Italiana di Matematica Applicata e Industriale (SIMAI), Ischia (IT), 5-9 June 2000
Record Number: 200011992 / Last updated on: 2000-06-05
Original language: en
Available languages: en