UNSTEADY FREE SURFACE WAVES BY DOMAIN DECOMPOSITION APPROACH (Abstract/Comunicazione in atti di convegno)

Type
Label
  • UNSTEADY FREE SURFACE WAVES BY DOMAIN DECOMPOSITION APPROACH (Abstract/Comunicazione in atti di convegno) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Alternative label
  • E.F. Campana, A. Iafrati (2001)
    UNSTEADY FREE SURFACE WAVES BY DOMAIN DECOMPOSITION APPROACH
    in 16th International Workshop on Water Waves and Floating Bodies, Hiroshima (JP), 22-25 Aprile 2001
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E.F. Campana, A. Iafrati (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.iwwwfb.org/Abstracts/iwwwfb16/iwwwfb16_03.pdf (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • Proceedings of the 16th International Workshop on Water Waves and Floating Bodies (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 4 (literal)
Note
  • PuMa (literal)
  • Comunicazione (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • INSEAN (literal)
Titolo
  • UNSTEADY FREE SURFACE WAVES BY DOMAIN DECOMPOSITION APPROACH (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 4-9900892-0-0 (literal)
Abstract
  • Several numerical techniques have been recently developed to deal with the complex free surface topology induced by the wave breaking (e.g. Tulin & Landrini 2000, Sussman & Dommermuth 2000). However, although these approaches are strictly needed in the free surface region, their use far from the interface is expensive and neither really necessary. For instance, when studying the wave breaking induced by a submerged body an accurate description of the flow field close to the body is not needed while the computational effffort can be focused about the free surface. For this reason, a domain decomposition approach is built which couple the Navier-Stokes solver, employed close to the interface, with a potential solver able to describe the flow in the body region. In a previous work (Iafrati et al. 2001), an unsteady Navier-Stokes solver coupled with a Level-Set technique has been developed to study wave breaking induced by bodies moving beneath the free surface. In this work this approach is used in the free surface region, where the unsteady Navier-Stokes equations are solved by using a finite difffference approach, while a Level-Set technique is used to follow the interface dynamics. Throughout the boundary of the computational domain velocity is assigned. In the body region, a boundary integral representation of the velocity potential is used with Neumann boundary conditions on the body contour and at inflow and outflow. Concerning the boundary conditions on the matching surface, two approaches are developed. In the first one, say Dirichlet type (DT), both the pressure and the velocity fields obtained from the Navier-Stokes solver are used within the unsteady Bernoulli's equation to obtain the velocity potential on the matching surface. In the second one, say Neumann type (NT), only the normal velocity obtained from the Navier-Stokes solver is used as a boundary condition on the matching surface. In both cases, the solution of the boundary integral formulation provides the velocity field on the matching to be used as boundary condition for the Navier-Stokes solver at the next time step. It is important to remark that, although here applied only in 2D problems, the proposed approaches are easily applicable also to 3D flows. In the following a brief description of the Navier-Stokes solver and of the Level-Set technique is given while further details can be found in Iafrati et al. (2001) and in Iafrati et al. (2000). The domain decomposition approach is applied to the wave system generated by a bump on the bottom of a channel and by a submerged hydrofoil. Comparisons with the full Navier-Stokes solution and with results obtained by a fully non linear boundary element solution are presented. (literal)
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