INVESTIGADORES
DARI Enzo Alberto
congresos y reuniones científicas
Título:
A variational approach for fluid-solid interaction problems using immersed domains
Autor/es:
PABLO J. BLANCO; ENZO A. DARI; RAÚL A. FEIJÓO
Lugar:
Venecia
Reunión:
Congreso; 8th. World Congress on Computational Mechanics (WCCM8), 5th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008); 2008
Institución organizadora:
IACM
Resumen:
In the present work a model to tackle the fluid?solid
interaction problem employing the concepts of immersed domains is
derived from a well?known governing variational principle from the
continuum mechanics. The goal of this work is to present a general
formulation in which an augmented fluid, composed by the real fluid and a
fictitious fluid that overlaps with the solid domain, interacts with an
immersed solid. The formulation is general and is very close from the
immersed finite element method [3,4,9] and from the immersed continuous
method [8] due to the appearance of a volume force defined over the
fictitious fluid domain. One of the major differences is that in the
present work the volume force in the fluid domain emerges as a reactive
force due to the imposition of the continuity in the velocity field
along the whole overlapped domain by means of a Lagrange multiplier.
Another difference lies in the manipulation of the mass conservation for
the artificial fluid. In this respect, we generalize the problem
eliminating the restriction to compressible fluid?compressible solid of
the immersed continuous method and the incompressible
fluid?incompressible solid of the immersed finite element method. In
last decades, numerous works have been oriented to the development of
techniques to deal with the fluid?structure interaction problem. In
particular, in the last ten years new formulations arose that al-lowed
to accommodate quite complex situations [2,4,5,7]. With a different
standpoint, Peskin's work on the immersed boundary method (IBM) [6]
became a basic reference for techniques in order to face the problem
using the ideas of immersion of domains. In subsequent years the
fictitious domain method (FDM) [1,2] was presented that formulates the
problem using distributed Lagrange multipliers along the corresponding
boundaries. Posteriorly, other generalizations of the FDM appeared, such
as the im-mersed finite element method (IFEM) that may be viewed as a
generalized class of fictitious domain methods for fluid mechanics in
which the immersed domain, in this case a solid, is subjected to
defor-mations and displacements. It must be remarked that in the IFEM
approach no Lagrange multipliers are used. Furthermore, no longer is the
IFEM formulation valid when the fluid is incompressible and the solid
compressible. In a recent work, the immersed continuous method (ICM) was
stated as a special case that remains valid only for the compressible
fluid?compressible solid interaction problem.