Engineering MECHANICS, Vol. 16, 2009, No. 6, p. 447–455 447 MODELING OF CAVITATION FLOW ON NACA 0015 HYDROFOIL Jaroslav ˇ Stigler*, Jan Svozil* This paper is concerning with simulations of cavitation flow around the NACA 0015 hydrofoil. The problem is solved as the multi-phase and single-phase model of flow, for two different impact angles and for two different densities of computational net. The attention is focused on the comparison of single-phase and multi-phase results. Keywords : cavitating flow, multiphase flow, NACA 0015 1. Introduction Modeling of cavitation flow as a multi-phase flow is a complex problem which does not lead to satisfying results especially when the cavitation is modeled as 3D. Therefore in the engineering practice cavitation flow is often modeled as a single-phase flow, where the cavitation area is handled as an area with the pressure lower then the vapor pressure. This approach always leads to the result, and the requirement of computer time is many times lower in comparison with multi-phase flow models. Moreover the steady solution of multi- phase flow model may not be found at all due to the unsteady nature of cavitation flow. The object of this paper is a comparison of single-phase and multi-phase models of cavita- ting flow with different densities of computational nets and different versions of a solver. This comparison is made by means of 2D flow round the NACA 0015 hydrofoil for two different impact angles. The solution will be done for two different versions of Fluent software 6.3.28 and 6.4. 2. Nomenclature Mark Title Unit c∞ Freestream velocity [m/s] Fz Uplift force on the hydrofoil [N] Cz Uplift coefficient [–] Cp Pressure coefficient [–] L Chord lengh [m] p∞ Freestream pressure [Pa] pvap Vapor pressure [Pa] px Pressure in the certain location on the hydrofoil [Pa] Lc Cavity lengh [–]  Density of fluid [kg/m 3 ] σ Cavitation number [–] * doc. Ing. J. ˇ Stigler, Ph.D., Ing. J. Svozil, Technical University of Brno, Faculty of Mechanical Engineering, V. Kaplan’s Department of Fluid Engineering, Technick´a 2, Brno