### ASA 124th Meeting New Orleans 1992 October

## 5aPAa3. Collapse of a bubble in the cavitation zone near a rigid boundary.

**Konstantin A. Kurbatskii
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*Dept. of Math., Florida State Univ., Tallahassee, FL 32306-3027
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**Valery K. Kedrinskii
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*Inst. of Hydrodynamics, Novosibirsk, 630090, Russia
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This paper discusses the cavitation erosion problem and one of its
difficult aspects, i.e., cumulative flow development in vapor-gas bubbles and
evaluation of parameters of high-speed microjets as main sources of impulse
influence on a nearby rigid wall (boundary). The axisymmetric potential problem
of cavity collapse in a nonviscous and incompressible liquid with variable
ambient pressure is considered. The Laplace's equation is solved numerically by
use of boundary-integral methods. The influence of a rigid wall is modeled by
the reflection method. Ambient pressure is calculated by use of a two-phase
liquid model describing cavitation cluster dynamics. The dynamics of a bubble
situated near a rigid boundary is investigated and the results are obtained for
cumulative jet formation in the bubble.