Unsteady effects in 2D modelling of partial cavitation using BEM
Author Vaz G., Bosschers J. and Falcão de Campos, J.A.C.
Title Unsteady effects in 2D modelling of partial cavitation using BEM
Month May-June
Year 2004

The authors have developed 2D steady and unsteady models for partial sheet cavitation analysis based on the Boundary Element Method (BEM). Using these models, this paper presents an analysis of the cavitating flow on a foil in a vertical gust similar to a ship wake peak and shows the influence of the reduced frequency on the cavitation characteristics. A quasi-steady analysis based on an equivalent unsteady wetted flow loading is compared to a fully unsteady analysis in order to give additional insight in the unsteady effects on the cavitation behavior.The results show that the quasi-steady analysis done with equivalent loading conditions overpredicts the effects of the reduced frequency. These unsteady effects are correctly taken into account in the full unsteady analysis and revealed to be important for the cavity dynamics. The trends in the variations of the minimum pressure, cavity length, cavity volume, cavity volume speed and cavity volume acceleration with the reduced frequency are evaluated.

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