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The present paper is devoted to the 3D numerical study of unsteady cloudcavitation around the CAV2003 benchmark hydrofoil using a passive cavitationcontroller method called cavitation-bubble generator (CGs). We investigate thispassive controller on the hydrofoil surface to affect the whole processes ofvaporization, bubble generation and bubble implosion. Firstly we simulate theunsteady cavitating flow around the hydrofoil without CGs using a Partially-averaged Navier Stokes (PANS) method. The turbulence approach is coupled with amass transfer model which implements to an open source finite-volume package.Then we tested different sizes and angles of CGs on the hydrofoil surface. Theresults of an appropriate design of the CGs shows a significant decrease of themaximum length of the attached cavity and a large decrease of wall-pressurefluctuation intensity on the hydrofoil surface.

Effect of Cavitating-bubble Generators on the Dynamics of Unsteady Cloud Cavitation