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Influence of Collapse of Cavitation Bubble Cloud on Erosion of Solid Surface in Hydraulic Machinery

Excerpt

Collapse of oil cavitation bubble clouds near the solid surface was performed by the numerical simulation, in which fluid-structure interaction and sub-grid scale bubble dynamics were taken into account. The effect of initial void fraction, initial bubble size and initial distribution of the cloud on the stress in the solid were examined. As the result, the collapse of the attached bubble cloud on the surface with high initial void fraction and small bubble size causes high stress in the solid.

Introduction
Basic Equations
Results and Discussions
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