Gas cavity-body interactions: efficient numerical solution (Contributo in atti di convegno)

Type
Label
  • Gas cavity-body interactions: efficient numerical solution (Contributo in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • Colicchio G. 1,2; Greco M. 1,2,3; Faltinsen O.M. 2,3; Brocchini M. 4 (2013)
    Gas cavity-body interactions: efficient numerical solution
    in Euromech Colloquium 555 Small-scale numerical methods for multi-phase flows, Pessac, France, 28.08.13 - 30.08.13
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Colicchio G. 1,2; Greco M. 1,2,3; Faltinsen O.M. 2,3; Brocchini M. 4 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 4 (literal)
Note
  • PuMa (literal)
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  • 1 CNR-INSEAN, Italian Ship Model Basin, Roma - Italy. 2 CeSOS and AMOS, NTNU, Trondheim - Norway. 3 Dept. of Marine Technology, NTNU, Trondheim - Norway. 4 DICEA, Università Politecnica delle Marche, Ancona, Italy. (literal)
Titolo
  • Gas cavity-body interactions: efficient numerical solution (literal)
Abstract
  • The study of the interactions between a gas cavity, the surrounding liquid and the nearby structures in the acoustic regime is very appealing because it involves several physical phenomena and it is of practical interest in different contexts: from the underwater explosions, to medical applications, to erosion of propellers. In Lingeman et al. (2009), the implosion of micro-bubbles close to human tissues has been studied in the case ultrasounds are used as a technique to remove calculi in human bodies. In Dular et al. 2009, it is shown that the cavitational bubble collapse can cause a shock wave associated with erosion damage on solid surfaces in hydraulic machinery. Although there are many practical studies associated with micro-bubble explosions most of the results are for military purposes in the case of underwater explosions of mines close to ships and offshore structures. There, it is necessary both to predict structural effects and to try to improve the design of the mentioned structures. To this purpose, physical tests were performed along the years and theories were developed (Cole 1948). Because of this availability of information, the first application of the present work focuses on underwater explosions for which most of the data useful for comparative purposes is available. Nonetheless, it is important to notice that all the above described problems are characterized by: 1) bubble oscillations with the generation and/or interaction with acoustic waves, 2) interaction of the acoustic waves with the surrounding structures, 3) reflection of the waves and 4) their interaction with the bubble. All these phenomena evolve within the so-called \"acoustic phase\", because compressibility is important for both water and gas phases. The study, here summarized, covers most of the points described above, some other results connected with this are referred into Colicchio et al. (2013). The following stage, where compressibility becomes unimportant for water and it is an issue only for the gaseous phase, has already been described in Colicchio et al. (2011). (literal)
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