Numerical study of unsteady behavior of cloud cavitation by smoothed particle hydrodynamics

Takahiro Ushioku, Hiroaki Yoshimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Cavitation generates a portion of cavities called a cavitation cloud, which performs a collective unsteady motion of repeating the process of growth and collapse. In particular, it is considered that a high-pressure shock wave propagates associated with the collapse. In order to understand such unsteady behaviors of the cavitation cloud, much effort has been made for the numerical analysis of internal flows of the cavitation cloud. However, it is not clear how such a cavitation cloud can be identified as a physical entity nor how its unsteady collective motion can be elucidated in the context of the multiphase fluid flow. In this study, we make a two-dimensional numerical analysis of the multiphase flow of the submerged bubbly water jet injecting into still water through a nozzle. To model the bubbly water jet, we employ the mixture model of liquids and gases, and we utilize the Smoothed Particle Hydrodynamics method for the numerical analysis of the unsteady flows in Lagrangian description. Finally, in order to clarify the unsteady behaviors of the cloud cavitation, we show how the cavitation cloud can be generated in the context of velocity fields in the multiphase flow and in particular, we clarify how twin vortices induced by the water jet play an essential role in the expansion and shrinkage of the cloud.

Original languageEnglish
Title of host publicationFluid Mechanics; Multiphase Flows
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791883723
DOIs
Publication statusPublished - 2020
EventASME 2020 Fluids Engineering Division Summer Meeting, FEDSM 2020, collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels - Virtual, Online
Duration: 2020 Jul 132020 Jul 15

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
Volume2
ISSN (Print)0888-8116

Conference

ConferenceASME 2020 Fluids Engineering Division Summer Meeting, FEDSM 2020, collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels
CityVirtual, Online
Period20/7/1320/7/15

Keywords

  • Cavitation cloud
  • Liquid-jet
  • Multiphase flow
  • Smoothed Particle Hydrodynamics (SPH)

ASJC Scopus subject areas

  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Numerical study of unsteady behavior of cloud cavitation by smoothed particle hydrodynamics'. Together they form a unique fingerprint.

Cite this