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Recent interest at Ispra in earthquake engineering problems and the availability in the near future of a large reaction-wall facility has provided motivation for extending the ALE kinematic description of coupled fluid-structure problems, based on finite element discretisation, to the transient flow of viscous incompressible fluids. A brief account is given of the numerical techniques currently in use to treat the hydrodynamic domain in the PLEXIS-3C finite element computer program for fluid-structure systems. The case of inviscid and compressible fluids is discussed. A two-step scheme separating the convective terms from the Lagrangian terms is employed for time integration of the spatially discrete ALE form of the conservation equations for mass, momentum and energy. An automatic rezone algorithm is used to generate appropriate mesh velocities at each time station and a combination of the ALE methodology and slide-line concepts typical of Lagrangian methods is employed to allow sliding of the fluid along interfaces with structures. The paper ends with a brief discussion of fractional-step algorithms for the finite element solution of unsteady viscous flows governed by the incompressible Navier-Stokes equations.

Additional information

Authors: DONEA J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Conférence Européenne sur les Nouvelles Avancées en Calcul des Structures, Giens (FR), April 2-5, 1991
Availability: Available from (1) as Paper EN 35956 ORA
Record Number: 199110370 / Last updated on: 1994-12-02
Original language: en
Available languages: en