A Comparative Study of Supercavitation Phenomena on Different Projectiles Shapes in Transient Flow by CFD

Mohsen Yehia Mansour, Nabil H. Mostafa, Mohamed H. Mansour, Magdy Abu Rayan

Abstract


Abstract:

Body shape of high-speed underwater vehicles has a great effect on the Supercavitation behaviour. The transient flow around either partially cavitating or supercavitating body affects the trajectory of high-speed underwater vehicles. Commercial code (ESI-CFD ACE+, V 2010) was used to simulate the supercavitation around two different shapes of a projectile with their noses of hemispherical shape and telescopic shape. Also, conical and blunt projectile shapes were considered. Also, a comparison between two different designs of grid was performed numerically. Grid designs were structured and unstructured grids. Navier-Stokes equations were used as governing equations for simulating supercavitation. Cavity shape was determined over projectile body and around wake. Also, two-dimensional flow field around the cavitating body was determined. Projectile body has a diameter about 0.4 times its length (0.4L).  In the case of the Blunt end there is a strong wake effect. The ESI-CFD code (2010) is valid for observing the supercavitation phenomena. Unstructured grid is more accurate than structured one in simulating supercavitation.


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