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Direct numerical evidence of stress-induced cavitation

Published online by Cambridge University Press:  11 July 2013

G. Falcucci*
Affiliation:
Department of Technologies, University of Naples ‘Parthenope’, Centro Direzionale - Isola C4, 80143 Naples, Italy
E. Jannelli
Affiliation:
Department of Technologies, University of Naples ‘Parthenope’, Centro Direzionale - Isola C4, 80143 Naples, Italy
S. Ubertini
Affiliation:
DEIM - Industrial Engineering School, University of Tuscia, Largo dell’Universitá s.n.c., 01100, Viterbo, Italy
S. Succi
Affiliation:
Istituto Applicazioni Calcolo, CNR, Via dei Taurini 19, 00185 Rome, Italy
*
Email address for correspondence: [email protected]

Abstract

In this paper direct numerical evidence of flow-induced incipient cavitation is presented through lattice Boltzmann simulations of multiphase flows with a non-ideal thermodynamic equation of state. Cavitation emerges spontaneously as a result of the underlying non-ideal interactions, with no need for any modelling criteria based on the fluid variables, such as pressure or stress tensor. The onset of cavitation is well captured by Joseph’s minimum tension criteria, (Joseph, J. Fluid Mech., vol. 366, 1998, pp. 367–378; Dabiri, Sirignano & Joseph, Phys. Fluids, vol. 19, 2007, 072112), complemented with surface tension corrections, as proposed by Brennen (Cavitation and Bubble Dynamics, Oxford University Press, 1995). The simulations also show that the cavitation number (${C}_{N} $) proves to be a poor predictor of the onset of cavitation. Finally, strong dependence of the bubble morphology on the surface tension is also highlighted.

Type
Papers
Copyright
©2013 Cambridge University Press 

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