Erosive aggressiveness of collapsing cavitating structures
Sören Schenke (TU Delft - Mechanical Engineering)
Thomas van Terwisga (Maritime Research Institute Netherlands (MARIN), TU Delft - Mechanical Engineering)
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Abstract
The erosive aggressiveness of idealized cavities collapsing on a flat surface is investigated by numerical simulation, employing the cavitation intensity approach by Leclercq et al (2017) as a measure of the local energy impact rate. We propose a more straight forward formulation of the cavitation intensity model and verify that it satisfies energy conservation requirements for the accumulated surface energy. Based on the cavitation intensity model, statistical aggressiveness indicators are proposed. The indicators account for the rapidness and frequency of the collapse events. The aggressiveness indicators are further applied to a NACA0015 hydrofoil surface.