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research article

Numerical and experimental investigation of shedding mechanisms from leading-edge cavitation

Arabnejad, Mohammad Hossein
•
Amini, Ali  
•
Farhat, Mohamed  
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October 1, 2019
International Journal Of Multiphase Flow

Leading-edge cavitation is responsible of the generation of transient cavities, usually made of clouds of bubbles. These transient cavities travel downstream to high-pressure regions and collapse violently, leading to noise and vibration as well as erosion. In the present paper, the focus is on the mechanisms generating transient cavities to better understand the starting point of the erosion process. The case studied is the cavitating flow over a NACA0009 hydrofoil which is investigated using experiments and numerical simulation. In the experimental part, which is conducted in EPFL high-speed cavitation tunnel, the shedding behavior is studied using high-speed visualization (HSV). In the numerical part, the cavitating flow is simulated using an incompressible solver coupled with isothermal homogeneous two-phase mixture cavitation model and Implicit Large Eddy Simulation (ILES) turbulence modelling. Owing to high speed visualization and numerical simulations, we identified two shedding mechanisms of transient cavities: (i) A primary shedding, characterized by a periodic generation of large cloud cavities and (ii) a secondary shedding of small-scale horse-shoe vortices, which are revealed for the first time. These small-scale structures, which are believed to play a major role in the erosion process, result from a complex interaction between the sheet cavity, the cloud cavity and re-entrant jets of different types. Furthermore, the detailed comparison between HSV and simulation confirms that the current numerical approach is capable of capturing the two types of shedding mechanisms very well. (C) 2019 Elsevier Ltd. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.ijmultiphaseflow.2019.06.010
Web of Science ID

WOS:000489191700010

Author(s)
Arabnejad, Mohammad Hossein
Amini, Ali  
Farhat, Mohamed  
Bensow, Rickard E.
Date Issued

2019-10-01

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

Published in
International Journal Of Multiphase Flow
Volume

119

Start page

123

End page

143

Subjects

Mechanics

•

Mechanics

•

cloud shedding mechanisms

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leading-edge cavitation

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high speed visualization

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implicit large eddy simulation

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large-eddy simulation

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cloud cavitation

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sheet cavitation

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flow

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transition

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMH  
Available on Infoscience
October 22, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/162176
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