Air-cavity ships (ACS) are advanced marine vehicles that use air injection under hull to improve the vessel’s hydrodynamic characteristics. Although the concept of drag reduction by supplying gas under the ship’s bottom was proposed in the 19th century by Froude and Laval, at this time there are not many systematic studies on this subject. This paper is a preliminary work with the purpose of being a basic tool for the design of the ACS with computational fluid dynamic methods. The study aims to conduct a series of computational tests to compare the numerical models of bubble with experimental data. The first step of this study was to investigate the behavior of free bubble in water, considering as parameters the critical mass of air, the rising speed and aspect ratio of the bubble. Then it is evaluated the interaction bubble-flat plate in order to obtain a reliable prediction of the behavior of air bubbles under the hull.

Cucinotta, F., Nigrelli, V., Sfravara, F. (2017). A preliminary method for the numerical prediction of the behavior of air bubbles in the design of air cavity ships. In V.N. Benoit Eynard (a cura di), Advances on Mechanics, Design Engineering and Manufacturing Proceedings of the International Joint Conference on Mechanics, Design Engineering & Advanced Manufacturing (JCM 2016), 14-16 September, 2016, Catania, Italy (pp. 509-516). Springer Heidelberg [10.1007/978-3-319-45781-9_51].

A preliminary method for the numerical prediction of the behavior of air bubbles in the design of air cavity ships

NIGRELLI, Vincenzo;
2017-01-01

Abstract

Air-cavity ships (ACS) are advanced marine vehicles that use air injection under hull to improve the vessel’s hydrodynamic characteristics. Although the concept of drag reduction by supplying gas under the ship’s bottom was proposed in the 19th century by Froude and Laval, at this time there are not many systematic studies on this subject. This paper is a preliminary work with the purpose of being a basic tool for the design of the ACS with computational fluid dynamic methods. The study aims to conduct a series of computational tests to compare the numerical models of bubble with experimental data. The first step of this study was to investigate the behavior of free bubble in water, considering as parameters the critical mass of air, the rising speed and aspect ratio of the bubble. Then it is evaluated the interaction bubble-flat plate in order to obtain a reliable prediction of the behavior of air bubbles under the hull.
2017
Settore ING-IND/15 - Disegno E Metodi Dell'Ingegneria Industriale
Cucinotta, F., Nigrelli, V., Sfravara, F. (2017). A preliminary method for the numerical prediction of the behavior of air bubbles in the design of air cavity ships. In V.N. Benoit Eynard (a cura di), Advances on Mechanics, Design Engineering and Manufacturing Proceedings of the International Joint Conference on Mechanics, Design Engineering & Advanced Manufacturing (JCM 2016), 14-16 September, 2016, Catania, Italy (pp. 509-516). Springer Heidelberg [10.1007/978-3-319-45781-9_51].
File in questo prodotto:
File Dimensione Formato  
cucinotta et al.pdf

Solo gestori archvio

Tipologia: Versione Editoriale
Dimensione 818.15 kB
Formato Adobe PDF
818.15 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
toc lnme.pdf

Solo gestori archvio

Descrizione: frontespizio e sommario
Tipologia: Versione Editoriale
Dimensione 234.18 kB
Formato Adobe PDF
234.18 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/221406
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 10
social impact