Weakly-nonlinear seakeeping model: regular/irregular wave interaction with a ship without/with forward speed (Contributo in atti di convegno)

Type
Label
  • Weakly-nonlinear seakeeping model: regular/irregular wave interaction with a ship without/with forward speed (Contributo in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Greco M. (1,2); Bouscasse B. (1); Colicchio G. (1,2); Lugni C. (1,2) (2009)
    Weakly-nonlinear seakeeping model: regular/irregular wave interaction with a ship without/with forward speed
    in International Workshop Water Waves Floating Bodies, 24th,, Zelenogorsk, Russia, 19-22 Aprile 2009
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Greco M. (1,2); Bouscasse B. (1); Colicchio G. (1,2); Lugni C. (1,2) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 4 (literal)
Note
  • PuM (literal)
  • Microsoft Academic Search (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) INSEAN, (2) CeSOS (literal)
Titolo
  • Weakly-nonlinear seakeeping model: regular/irregular wave interaction with a ship without/with forward speed (literal)
Abstract
  • Present investigation concerns the further development of the numerical potential-flow method described in Greco et al. (2008). This couples (A) a 3D weakly nonlinear solver based on the weak-scatterer hypothesis (Pawlowski 1991) with (B) a 2D shallow-water solver on the deck plane, which handle,respectively, the ship seakeeping and the water shipping. The boundary conditions for the shallow-water problem have been improved when a bulwark is present, both in terms of the deck-plane velocity (u, v) and of the water level h: the partial reduction of the water flow through the local deck contour and the partial reflection of the liquid by the obstacle are accounted for. The former is introduced as a correction of the shallow-water velocity solution, the latter is enforced as a liquid layer to be added to the deck-contour water level given as boundary condition by the external field. The latter, i.e. the h boundary condition from the seakeeping problem is different than zero only during a water-on-deck phase. A simplified criterion for the slamming occurrence has been implemented, based on the impact angle and the pressure level associated with the phenomenon. The slamming and water-entry local loads were handled by means of a Wagner-theory approach (Wagner 1932). The solution method has been extended to handle the forward motion of the vessel, under the assumptions of small ship speed Uship and following the work by Salvesen et al. (1970). It means that the forward-motion effects are introduced as an explicit correction of: (a) the zero-speed frequency-dependent hydrodynamic coefficients, (b) the Froude-Krylov load contribution and (c) the wave field around the vessel. This approximation has the advantage of being computationally cheap, but its applicability is limited and must be assessed. Finally, the solver description of the incoming waves has been extended to handle irregular waves as a superposition of linear regular waves. Regular-sea conditions are described instead as second-order Stokes'waves. (literal)
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