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Numerical and Experimental Investigation of Transition Induced Vibration on a Hydrofoil
Antoine Ducoin, Jacques André Astolfi

Last modified: 2018-05-07

Abstract


The objective of this paper is to investigate the behavior of Laminar Separation Bubble (LSB) induced vibration on a NACA66TMB hydrofoil section. In this context, Direct Numerical Simulations are first performed on a rigid hydrofoil using the massively parallelized open source code Nek5000 that uses the high order spectral element method to solve the incompressible Navier Stokes equations. It is validated by comparing the wall pressure coefficient obtained with measurements performed in hydrodynamic tunnel at the French Naval Academy Research Institute (IRENav). A Reynolds numbers of Re=450,000 is considered with an angle of attack of 4° which induces a Laminar Separation Bubble close from the trailing edge of the hydrofoil. The results suggest that a very sharp transition occurs upstream the Laminar Separation Bubble, characterized by a typical H type behavior. This induces a high and localized level of wall pressure fluctuations with periodic behavior just upstream the LSB, followed by a rapid development of turbulence, also observed experimentally. This high level of pressure fluctuation may strongly interacts with the hydrofoil natural vibrations, as suggested by preliminary experimental results. The current numerical model will be extended in the near future to study fluid structure interaction in transitional flows.


Keywords


hydrofoil; flow separation; turbulence

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