The paper is based on some previous works of the authors aimed to study the phenomenology of cavitation instabilities. In the present work, a particular attention is paid to the analysis of spatio-temporal wall-pressure fluctuations in the context of fluid structure coupling investigations. The work is based on a numerical and experimental study, whose objective was to analyze the wall-pressure fluctuations beneath an unsteady partial cavitating flow developing on an hydrofoil. Experiments were carried in a water tunnel, on a partially cavitating hydrofoil based on extended multi-point wall pressure measurements together with flow visualizations. 2D Navier-Stokes simulations solves the RANS equations combined with a physical model of cavitation The two-phase flow mixture is considered as a homogeneous medium for which the ratio of liquid and vapor is controlled by a barotropic state law. The numerical resolution is based on the SIMPLE algorithm, modified to take into account the high compressibility of the liquid/vapor mixture. The results show that various dynamics are caught by the model in agreement with the experiments. Two main unstable dynamics were observed leading to a strong variation of surface loading. The paper provides quantitative data about the severe unsteady loading that is experienced by the structure, which should very useful in a fully problem of Fluid Structure Interaction. The possibility of a structural response of the foil to the unsteady loading and how it could promote the cavitating flow instability is also discussed.
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ASME 2005 Pressure Vessels and Piping Conference
July 17–21, 2005
Denver, Colorado, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4189-8
PROCEEDINGS PAPER
A Numerical and Experimental Investigation of Wall-Pressure Fluctuations Induced by Sheet Cavitation Instabilities on Lifting Surface
Jacques-Andre´ Astolfi,
Jacques-Andre´ Astolfi
Institut de Recherche de l’Ecole Navale, Brest-Armees, France
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Jean-Baptiste Leroux,
Jean-Baptiste Leroux
ENSAM Lille/LML UMR, Lille Cedex, France
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Olivier Coutier-Delgosha,
Olivier Coutier-Delgosha
ENSAM Lille/LML UMR, Lille Cedex, France
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Franc¸ois Deniset
Franc¸ois Deniset
Institut de Recherche de l’Ecole Navale, Brest-Armees, France
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Jacques-Andre´ Astolfi
Institut de Recherche de l’Ecole Navale, Brest-Armees, France
Jean-Baptiste Leroux
ENSAM Lille/LML UMR, Lille Cedex, France
Olivier Coutier-Delgosha
ENSAM Lille/LML UMR, Lille Cedex, France
Franc¸ois Deniset
Institut de Recherche de l’Ecole Navale, Brest-Armees, France
Paper No:
PVP2005-71187, pp. 63-71; 9 pages
Published Online:
July 29, 2008
Citation
Astolfi, J, Leroux, J, Coutier-Delgosha, O, & Deniset, F. "A Numerical and Experimental Investigation of Wall-Pressure Fluctuations Induced by Sheet Cavitation Instabilities on Lifting Surface." Proceedings of the ASME 2005 Pressure Vessels and Piping Conference. Volume 4: Fluid Structure Interaction. Denver, Colorado, USA. July 17–21, 2005. pp. 63-71. ASME. https://doi.org/10.1115/PVP2005-71187
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