TY - JOUR
T1 - A finite-element/boundary-element method for three-dimensional, large-displacement fluid-structure-interaction
AU - van Opstal, T.M.
AU - van Brummelen, E.H.
AU - van Zwieten, G.J.
PY - 2015/2/1
Y1 - 2015/2/1
N2 - This paper presents a hybrid finite-element/boundary-element method for fluid-structure-interaction simulations of inflatable structures. The flow model consists of the steady Stokes equation, which admits a boundary-integral formulation. The structure is represented by a Kirchhoff-Love shell. The boundary-element approximation of the Stokes equation reduces the flow problem to an integral equation on the actual structure configuration, thus obviating the need for volumetric meshing of the strongly deforming fluid domain. The Stokes model moreover exhibits a lubrication effect that acts as an intrinsic mechanism to treat the ubiquitous self-contact that occurs in inflation problems. The aggregated fluid-structure-interaction problem, composed of the boundary-integral equation and the Kirchhoff-Love shell connected by dynamic and kinematic interface conditions, is approximated by means of isogeometric discretizations to accommodate the smoothness requirements on the approximation spaces imposed by the flexural rigidity in the Kirchhoff-Love shell and to provide an accurate and smooth representation of the boundary for the boundary-element method. Auxiliary results presented in this paper are: (1) a parametrization-free Kirchhoff-Love formulation; (2) establishment of a cubic relationship between distance and tractions due to the lubrication effect; and (3) the interpretation of the Lagrange multiplier pertaining to fluid incompressibility as the total excess pressure.
AB - This paper presents a hybrid finite-element/boundary-element method for fluid-structure-interaction simulations of inflatable structures. The flow model consists of the steady Stokes equation, which admits a boundary-integral formulation. The structure is represented by a Kirchhoff-Love shell. The boundary-element approximation of the Stokes equation reduces the flow problem to an integral equation on the actual structure configuration, thus obviating the need for volumetric meshing of the strongly deforming fluid domain. The Stokes model moreover exhibits a lubrication effect that acts as an intrinsic mechanism to treat the ubiquitous self-contact that occurs in inflation problems. The aggregated fluid-structure-interaction problem, composed of the boundary-integral equation and the Kirchhoff-Love shell connected by dynamic and kinematic interface conditions, is approximated by means of isogeometric discretizations to accommodate the smoothness requirements on the approximation spaces imposed by the flexural rigidity in the Kirchhoff-Love shell and to provide an accurate and smooth representation of the boundary for the boundary-element method. Auxiliary results presented in this paper are: (1) a parametrization-free Kirchhoff-Love formulation; (2) establishment of a cubic relationship between distance and tractions due to the lubrication effect; and (3) the interpretation of the Lagrange multiplier pertaining to fluid incompressibility as the total excess pressure.
KW - Catmull-Clarksubdivision
KW - Fluid-structureinteraction
KW - Incompressibilityconstraint
KW - Inflatablestructures
KW - Isogeometricanalysis
KW - Lubricationeffect
UR - http://www.scopus.com/inward/record.url?scp=84910596219&partnerID=8YFLogxK
U2 - 10.1016/j.cma.2014.09.037
DO - 10.1016/j.cma.2014.09.037
M3 - Article
AN - SCOPUS:84910596219
SN - 0045-7825
VL - 284
SP - 637
EP - 663
JO - Computer Methods in Applied Mechanics and Engineering
JF - Computer Methods in Applied Mechanics and Engineering
ER -