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Courtesy of
Ecole Nationale Superieure d'Ingenieurs des Etudes et
Techniques d'Armement (ENSIETA), France
Professor F. Grosjean and his student, S. Sauvage, at ENSIETA in France
have validated an iterative approach to modeling of fluid-structure interaction.
Their study, presented at the 1998 Abaqus Users' Conference, examines
the deformation of a thin aluminum slab in a cross flow of air by coupling
a FLUENT simulation of the airflow to an Abaqus prediction of the structural
deformation. Starting with prediction of air flow around the undeformed
slab, the researchers determined the pressure forces on the slab and used
these as input to Abaqus. Abaqus calculations predicted the slab deformation,
which was used to redefine the FLUENT mesh defining the flow geometry.
Using the modified mesh, the FLUENT calculations predicted new pressure
forces as modified inputs to the Abaqus run. By iterating between the
two codes, the ENSIETA team converged to a steady-state prediction of
the flow around the deformed slab.
By coupling a FLUENT simulation of air flow with an Abaqus prediction
of structural deformation, the ENSIETA team obtained this steady-state
prediction of air flow around a deformed thin aluminum slab.
The calculation procedure was validated against wind tunnel test data
on deformation and drag. Calculations were within about 3% of measurements
for both quantities.
The coupled FLUENT/Abaqus calculation of slab deformation
in a crossflow agreed well with the windtunnel data.
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