Journal
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
Volume 113, Issue -, Pages 304-315Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmultiphaseflow.2018.10.013
Keywords
Micro spall; Cavity; Volume of fluid (VOF); Free surface; Pore competition
Categories
Funding
- CEA (Commissariat a lenergie atomique et aux energies alternatives)
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The 'micro-spall' phenomenon is a variant of fragmentation process-or spall fracture-that is traditionally discussed in context of solid materials (metals). However it concerns situations in which the medium is fully or partially melted-be it due to kinetic impact, detonation or laser loading. The phenomenon takes place at sub-micrometer and sub-microsecond scales making it inaccessible to direct experimental observation; so far, investigations have been restricted to observations of late time post-mortem fragments. In this context, it becomes a viable approach to apply analysis using numerical description for fluids. This work presents such an application for an idealized rapid uniaxial (one-dimensional) system expansion. Cavitation in the medium is represented by including vacuous pores or cavities with surface tension whose growth and interaction are traced in time. The simulations reveal two main regimes of pore growth regulated by a characteristic Weber number. (C) 2018 Elsevier Ltd. All rights reserved.
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