Hydrodynamics of planing hulls: a comparison between RANS and 2D + t potential flow models (Contributo in atti di convegno)

Type
Label
  • Hydrodynamics of planing hulls: a comparison between RANS and 2D + t potential flow models (Contributo in atti di convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. Iafrati, R. Broglia (2008)
    Hydrodynamics of planing hulls: a comparison between RANS and 2D + t potential flow models
    in Twenty-seventh Symposium on Naval Hydrodynamics, Seoul (KR), 5-10 Ottobre 2008
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Iafrati, R. Broglia (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 19 (literal)
Note
  • Google Scholar (literal)
  • PuMa (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • INSEAN (literal)
Titolo
  • Hydrodynamics of planing hulls: a comparison between RANS and 2D + t potential flow models (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 0-9798095-2-5 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • Office of Naval Research (literal)
Abstract
  • The flow generated by a wedge shaped hull planing with a constant trim angle is simulated numerically. The study is mainly focused on the evaluation of the free surface shape and of the pressure field acting beneath the hull. Particular attention is devoted to the fore part of the hull where nonlinear terms play a relevant role. Both a 2D+t, fully nonlinear method for potential flow and a threedimensional RANS solver are used. It is shown that the RANS model correctly captures the finest details of the flow and the sharpest pressure peak, although a very accurate grid refinement is needed about the jet region, starting from the jet root. The free surface shape obtained by the two numerical models are in good agreement, provided the 2D + t results are corrected to account for the rise up of the water in front of the hull. The comparison in terms of the pressure distribution is rather satisfactory in the fore part of the hull where the chine is still un-wetted. As soon as the jet tip arrives at the chine, the lack of any information about the threedimensionality of the flow significantly affect the solution obtained by the 2D + t model. The pressure distribution exhibits a rather sharp drop when the root of the jet arrives at the chine. The solution provided by the three-dimensional RANS solver is characterized by a much smoother transition, and comparisons with experimental data are fairly good. (literal)
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