Comparison of Two Computational Methods for High-Velocity Cavitating Flows Around Conical Projectiles:OTi-HULL Hydrocode and Two-Phase Flow Method

Abstract

We present a comparison between two CFD methods for the axisymmetric case: the hydrocode named OTi-HULL and the two-phase flow model presented in the Cocchi's thesis. These methods are applied to the calculation of a test case: a biconical body (nose cone with a cylindrical part and rear cone) at a velocity of 3000 m/s in water. Cocchi's results are comparable to the HULL ones outside the cavity, but inside the cavity the HULL results are wrong in temperature (too high) and in density (too low) compared to Cocchi's. For the cavity width, the results show an acceptable agreement between the twm methods for the cones with the half-angles of 45° and 30°. But for the 15° cone there are some discrepancies: the cavity is 10% larger for Cocchi's results in which the phase change of water in taken into account. These results have to be confirmed by experiments.