Analysis of Hydrofoil Cavitation using Proper Orthogonal Decomposition
Author Negrato, C., Van Terwisga, T.J.C. and Bensow, R.
Title Analysis of Hydrofoil Cavitation using Proper Orthogonal Decomposition
Conference/Journal 20th Numerical Towing Tank Symposium (NuTTS), Wageningen, The Netherlands
Month October
Year 2017

Abstract
Cavitation is the change of phase from liquid to vapor when the pressure falls below the saturation pressure. For marine propellers, occurrence of cavitation is accepted on modern designs. However, there is a need to keep cavitation under control, because its extent can influence propeller efficiency, as well as lead to undesired phenomena such as increased noise and erosion. To understand the dynamics of cavitation, researchers often focus on cavitation on simpler geometries, such as hydrofoils. In this work, the test case consists on a two dimensional NACA0015 hydrofoil. The results from a viscous flow simulation are considered here; the scope is to gain additional insight into cavitation dynamics in a regime of cavity shedding, by applying a Proper Orthogonal Decomposition (POD) technique. POD is used for analysis of experimental data or CFD results and relies on the approximation of the flow field by a linear combination of basis functions which are representative of flow structures.
This paper provides a description of the numerical setup and the basic theoretical background for POD and shows the outcome of orthogonal decomposition for two scalar fields: the vapor volume fraction and the pressure coefficient.

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