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RANS computations of tip vortex cavitation

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, , Citation Jean Decaix et al 2015 J. Phys.: Conf. Ser. 656 012183 DOI 10.1088/1742-6596/656/1/012183

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jean.decaix@hevs.ch

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1 University of Applied Sciences and Arts, Western Switzerland, 47 Route du Rawyl, 1950 Sion, Switzerland

2 Univ. Grenoble Alpes, LEGI, F-38000 Grenoble, France, CNRS, LEGI, F-38000 Grenoble, France

3 Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, 33 Bis Av. De Cour, 1007 Lausanne, Switzerland

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1742-6596/656/1/012183

Abstract

The present study is related to the development of the tip vortex cavitation in Kaplan turbines. The investigation is carried out on a simplified test case consisting of a NACA0009 blade with a gap between the blade tip and the side wall. Computations with and without cavitation are performed using a R ANS modelling and a transport equation for the liquid volume fraction. Compared with experimental data, the R ANS computations turn out to be able to capture accurately the development of the tip vortex. The simulations have also highlighted the influence of cavitation on the tip vortex trajectory.

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10.1088/1742-6596/656/1/012183