Three-Dimensional Modeling of Supercavitating Flow to Investigate the Effect of Attack Angle on Drag Coefficient

The high-speed submersion projectiles are designed to move in the supercavitation regime. In these conditions, the frictional drag decreases and the pressure drag becomes the dominant force against the projectile movement. A number of cavitation models have been suggested by researchers in order to simulate various types of cavitation flows. In the present work, by choosing a proper cavitation model, the supercavitation flow is modeled around a disk cavity. The supercavitation parameters are measured and compared with the experimental and analytical results. In this research, the supercavitating flow is simulated in different angles of attack and the drag coefficient is obtained in different cavitation numbers. The results of numerical analysis are compared with the results of quasi-empirical relations. Finally, using the results of numerical analysis, a correlation coefficient is proposed for calculating the drag coefficient at different attack angles for a range of cavitation numbers.