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Modeling bubble collapse aggressiveness in traveling bubble cavitation using bubble breakup model
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SYSNO ASEP 0388315 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Modeling bubble collapse aggressiveness in traveling bubble cavitation using bubble breakup model Author(s) Zima, Patrik (UT-L) RID
Sedlář, M. (CZ)Source Title Proceedings of the Eighth International Symposium on Cavitation (CAV 2012). - Singapore : Research Publishing Services, 2012 / Ohl C-D. ; Klaseboer E. ; Ohl S. W. ; Gong S. W. ; Khoo B. CH. - ISBN 978-981-07-2826-7 Pages s. 182-186 Number of pages 5 s. Publication form Print - P Action International Symposium on Cavitation /8./ CAV 2012 Event date 13.08.2012-16.08.2012 VEvent location Singapur Country SG - Singapore Event type WRD Language eng - English Country SG - Singapore Keywords bubble collapse ; traveling bubble cavitation ; numerical modeling Subject RIV BK - Fluid Dynamics R&D Projects GAP101/10/1428 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20760514 - UT-L (2005-2011) DOI 10.3850/978-981-07-2826-7_209 Annotation The paper presents the latest progress in assessing the collapse aggressiveness of cavitation bubbles in near-steady-state flow with traveling bubble cavitation using two-way coupling of the RANS equation and the Rayleigh-Plesset equation. The aggressiveness is determined from the energy dissipated during the collapse. It is assumed that bubbles break up under suitable conditions. The criterion for bubble breakup is based on the linear Rayleigh-Taylor analysis of the spherical bubble surface. The model is tested numerically for a 2D hydrofoil. The bubbles are assumed spherical and their interaction with the solid wall is not considered. Material effects due to cavitation erosion are not studied. The model is implemented in the in-house 3-D solver for turbulent pump flow. The numerical results for the 2D hydrofoil are compared to the erosion patterns obtained on the hydrofoil surface obtained from the cavitation tunnel measurement. Extension to complex 3D geometries, such as pump impellers or nozzles, where the condition of traveling or bubbly cavitation mode is fulfilled, is straightforward. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2013
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