ASA 124th Meeting New Orleans 1992 October

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

Konstantin A. Kurbatskii

Dept. of Math., Florida State Univ., Tallahassee, FL 32306-3027

Valery K. Kedrinskii

Inst. of Hydrodynamics, Novosibirsk, 630090, Russia

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.