Abstract
The two-phase flow generated behind a cavitating backward-facing step is studied using the combination of three experimental techniques: wall-pressure measurements, global high-speed imaging with visible light, and high spatial and temporal resolution x-ray imaging. Three zones are identified based on the topology of the vapor fraction maps, that correspond to vaporization, transport, and condensation. Simultaneous pressure and void fraction measurements reveal that extreme events are associated with a change from a shear layer mode to a wake mode, with a temporal signature that is heavily affected by the presence of the vapor phase.
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